Hurricane Sally, Wildfires, And COVID-19

The Atlantic is heating up with Paulette, Rene, Sally, Teddy, and Vicky. Rene is no more, while Paulette and Sally are hurricanes. Sally is the biggest threat as it is in the Gulf of Mexico, which I will discuss later. There are monster wildfires burning in California, Oregon, and Washington. This is all on top of the COVID-19 pandemic. As of 9/14/2020, there are over 29 million confirmed cases of COVID-19 with more than 932,000 deaths. There are over 7 million who are currently infected with more than 60,000 who are severely ill. It is from Worldometer. If you want to read my analysis on COVID-19, check out my other blog, The Ebola Zone. 2020 has been nothing but a terrible year all around no matter how one spins it. The whole world is of never ending disasters ranging from public health to weather. So much ground the cover.

The whole West is on fire. The whole West is covered in thick and acrid smoke. It is from Regional and Mesoscale Meteorology Branch (RAMMB)

Here is a heat map of active wildfires in the past 7 days. It is from Visible Infrared Imaging Radiometer Suite (VIIRS), which has a resolution of 375 meters or 1,230 feet. It is from NASA Active Fire Data. The heatmap is within 100 mile/160 kilometers radius from the point show.

It is really dire in the Western US. The whole West is on fire. Dire is a severe understatement. The death toll is probably going to be high once it is all over. Here is a Dense Smoke Advisory from NWS Reno.

URGENT - WEATHER MESSAGE
National Weather Service Reno NV
218 PM PDT Mon Sep 14 2020

CAZ070>073-NVZ001>005-160000-
/O.NEW.KREV.SM.Y.0009.200914T2118Z-200916T0000Z/
Surprise Valley California-Lassen-Eastern Plumas-
Eastern Sierra Counties-Greater Lake Tahoe Area-Mono County-
Mineral and Southern Lyon Counties-Greater Reno-Carson City-
Minden Area-Western Nevada Basin and Range including Pyramid Lake-
Northern Washoe County-
Including the cities of Cedarville, Eagleville, Fort Bidwell,
Portola, Susanville, Westwood, Sierraville, Loyalton,
South Lake Tahoe, Tahoe City, Truckee, Markleeville, Bridgeport,
Coleville, Lee Vining, Mammoth Lakes, Hawthorne, Yerington,
Smith Valley, Mina, Schurz, Stateline, Glenbrook,
Incline Village, Sparks, Verdi, Gardnerville, Virginia City,
Fernley, Fallon, Lovelock, Silver Springs, Nixon, Imlay, Empire,
and Gerlach
218 PM PDT Mon Sep 14 2020

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 5 PM PDT TUESDAY...

* WHAT...Light west-southwest winds will continue to push smoke
into the region from several wildfires burning across
California. The near-surface smoke concentration may improve
during the afternoon today and tomorrow but looks to degrade
during the evening and overnight hours through Tuesday.

* WHERE...Western Nevada Basin and Range including Pyramid Lake,
Mineral and Southern Lyon Counties, Mono County, Surprise
Valley California, Lassen-Eastern Plumas-Eastern Sierra
Counties, Greater Lake Tahoe Area, Greater Reno-Carson City-
Minden Area and Northern Washoe County.

* WHEN...Until 5 PM PDT Tuesday.

* IMPACTS...Poor air quality and reduced visibility below one mile
in areas. Check airnow.gov for updated air quality information.

* ADDITIONAL DETAILS...The areas which will see the highest risk
of dense smoke will be the Eastern Sierra, Carson Valley, Smith
Valley, Hawthorne, and northeastern California.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Stay indoors as much as possible when smoke is present. Avoid
strenuous activity, especially if you are sensitive to poor air
quality, such as the elderly, children and anyone with chronic
illness or respiratory problems. Consider postponing outdoor
activities. Check airnow.gov for the latest air quality
information.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/rev

People are advised to stay indoor. That is nearly impossible for people who have to evacuate in the fire zone. I do not know when the fires will end. The sooner the better. Anyways, let’s go to Hurricane Sally.

Hurricane Sally is a Category 2 hurricane with 100 mph winds. This as of 10:00 PM CDT from the National Hurricane Center (NHC). It is close to the coast and moving slowly.

000
WTNT34 KNHC 150311 CCA
TCPAT4

BULLETIN
Hurricane Sally Advisory Number 15...Corrected
NWS National Hurricane Center Miami FL AL192020
1000 PM CDT Mon Sep 14 2020

Corrected Storm Surge Hazards section

...OUTER RAIN BANDS MOVING ONSHORE IN THE FLORIDA PANHANDLE...
...LIFE-THREATENING STORM SURGE, HURRICANE-FORCE WINDS, AND FLASH
FLOODING LIKELY ALONG PORTIONS OF THE NORTHERN GULF COAST STARTING
LATER TONIGHT AND TUESDAY...

SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...28.9N 87.6W
ABOUT 90 MI...145 KM E OF THE MOUTH OF THE MISSISSIPPI RIVER
ABOUT 130 MI...210 KM SE OF BILOXI MISSISSIPPI
MAXIMUM SUSTAINED WINDS...100 MPH...155 KM/H
PRESENT MOVEMENT...WNW OR 300 DEGREES AT 3 MPH...6 KM/H
MINIMUM CENTRAL PRESSURE...986 MB...29.12 INCHES

WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

The Hurricane Warning west of Grand Isle to Morgan City, Louisiana,
has been downgraded to a Tropical Storm Warning.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...
* Port Fourchon Louisiana to the Okaloosa/Walton County Line Florida
* Lake Pontchartrain, Lake Maurepas, and Lake Borgne
* Mobile Bay

A Hurricane Warning is in effect for...
* Grand Isle Louisiana to the Navarre Florida
* Lake Pontchartrain and Lake Maurepas including metropolitan New
Orleans

A Tropical Storm Warning is in effect for...
* East of of Navarre Florida to Indian Pass Florida
* West of Grand Isle to Morgan City Louisiana

A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 36 hours in the indicated locations. For a depiction
of areas at risk, please see the National Weather Service Storm
Surge Watch/Warning Graphic, available at hurricanes.gov. This is a
life-threatening situation. Persons located within these areas
should take all necessary actions to protect life and property from
rising water and the potential for other dangerous conditions.
Promptly follow evacuation and other instructions from local
officials.

A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area. Preparations to protect life
and property should be rushed to completion.

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.

For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.

DISCUSSION AND OUTLOOK
----------------------
At 1000 PM CDT (0300 UTC), the center of Hurricane Sally was located
near latitude 28.9 North, longitude 87.6 West. Sally is moving
toward the west-northwest near 3 mph (6 km/h) and this motion is
expected to continue through Tuesday morning. A northward turn is
likely by Tuesday afternoon, and a slow north-northeastward to
northeastward motion is expected Tuesday night through Wednesday
night. On the forecast track, the center of Sally will move near
the coast of southeastern Louisiana tonight and Tuesday, and make
landfall in the hurricane warning area Tuesday night or Wednesday.

Maximum sustained winds are near 100 mph (155 km/h) with higher
gusts. Some strengthening is forecast early Tuesday and Sally is
expected to be a dangerous hurricane when it moves onshore along the
north-central Gulf coast.

Hurricane-force winds extend outward up to 45 miles (75 km) from the
center and tropical-storm-force winds extend outward up to 125 miles
(205 km). A buoy south of Dauphin Island, Alabama, recently
reported sustained winds of 61 mph (98 km/h) and a wind gust of 69
mph (111 km/h).

The estimated minimum central pressure based on data from the
NOAA and Air Force Hurricane Hunters is 986 mb (29.12 inches).

HAZARDS AFFECTING LAND
----------------------
Key messages for Sally can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC,
and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml

STORM SURGE: The combination of a dangerous storm surge and the
tide will cause normally dry areas near the coast to be flooded by
rising waters moving inland from the shoreline. The water could
reach the following heights above ground somewhere in the indicated
areas if the peak surge occurs at the time of high tide...

Mouth of the Mississippi River to Dauphin Island including Lake
Borgne...6-9 ft
Mobile Bay...6-9 ft
Lake Pontchartrain and Lake Maurepas...3-5 ft
Dauphin Island to AL/FL Border...4-7 ft
Port Fourchon to Mouth of the Mississippi River...2-4 ft
AL/FL Border to Okaloosa/Walton County Line including Pensacola Bay
an Choctawhatchee Bay...2-4 ft
Okaloosa/Walton County Line to Chassahowitzka including Saint Andrew
Bay...1-3 ft
Burns Point to Port Fourchon...1-2 ft

Overtopping of local levees outside of the Hurricane and Storm
Damage Risk Reduction System is possible where local inundation
values may be higher than those shown above.

The deepest water will occur along the immediate coast in areas of
onshore winds, where the surge will be accompanied by large and
damaging waves. Surge-related flooding depends on the relative
timing of the surge and the tidal cycle, and can vary greatly over
short distances. For information specific to your area, please see
products issued by your local National Weather Service forecast
office.

WIND: Hurricane conditions are expected to begin within the
hurricane warning area later tonight and Tuesday. Tropical storm
conditions expected to begin within the warning area during the
next few hours.

RAINFALL: Sally is expected to be a slow moving system as it
approaches land, producing 8 to 16 inches of rainfall with isolated
amounts of 24 inches over portions of the central Gulf Coast from
the western Florida Panhandle to far southeastern Mississippi
through the middle of the week. Life-threatening flash flooding is
likely. In addition, this rainfall will likely lead to widespread
minor to isolated major flooding on area rivers.

Sally is forecast to turn inland early Wednesday and track across
the Southeast producing rainfall of 4 to 8 inches, with isolated
maximum amounts of 12 inches, across portions of eastern
Mississippi, central Alabama, northern Georgia, southeastern
Tennessee, and the western Carolinas. Significant flash and urban
flooding is likely, as well as widespread minor to moderate flooding
on some rivers.

Outer bands of Sally could produce additional rainfall of 1 to 3
inches across the Florida peninsula through tonight. This rainfall
may produce flash and urban flooding and prolong high flows and
ongoing minor flooding on rivers across central Florida.

TORNADOES: A tornado or two will be possible late tonight through
early Tuesday in coastal areas of the Florida Panhandle and Alabama.
The threat for tornadoes should increase and slowly spread inland
during the day on Tuesday.

SURF: Swells from Sally will continue to affect the coast from the
Florida Big Bend westward to southeastern Louisiana during the next
couple of days. These swells are likely to cause life-threatening
surf and rip current conditions. Please consult products from your
local weather office.

NEXT ADVISORY
-------------
Next intermediate advisory at 100 AM CDT.
Next complete advisory at 400 AM CDT.

$$
Forecaster Cangialosi/Stewart

How strong will Sally get? Here is an intensity forecast. The data and intensity forecast are from NCAR-Tropical Cyclone Guidance.

Most forecast model keep Sally at Category 2. The exception is SHF5, which has it as a Category 3 hurricane. I think Sally will become a Category 3 hurricane and make landfall as one somewhere along the Central Gulf Coast. Many are wondering where Sally will go. Here is a heat map using points within 300 mile/480 kilometers radius. I used the latest forecast, which is 0000Z. All GIS maps are created from QGIS.

Most models have Sally making landfall on Mississippi or Alabama on Tuesday night to early Wednesday morning. The slow motion of the hurricane increases chance of higher storm surge and heavier rain. Flooding would be a serious problem for areas affected by Sally. As I am typing, tropical storm force winds are affecting Alabama, Florida, and Louisiana. It should reach Mississippi later tonight.

Hurricane force winds extend up to 45 miles from the center with tropical storm force winds extending up to 125 miles. Sally is not a large hurricane. Smaller hurricanes produce lower storm surge. However, the slow movement is likely to produce higher storm surge. It is also the width and and slope of the ocean bottom that is a factor as well. The area where Sally is has produced monster storm surge from Camille and Katrina. I am not expecting storm surge comparable to Camille or Katrina at this time.

So much weather events going on in America on top of COVID-19 pandemic that is ravaging the world. Hopefully, anyone who needed to evacuate did evacuate.

Unsurvivable Storm Surge With Large And Destructive Waves

NOAA/NESDIS/STAR GOES ABI BAND 13 OR_ABI-L1b-RadC-M6C13_G16_s20202400211172_e20202400213557_c20202400214020.nc

Straight out of the National Hurricane Center (NHC) advisory. Very ominous wording from them. Anyone who has not escaped from the coast are going to be in a very long and rough night ahead. Hurricane Laura is going to be a very brutal hurricane for Southwest Louisiana and East Texas.

000
WTNT33 KNHC 262342
TCPAT3

BULLETIN
Hurricane Laura Intermediate Advisory Number 28A
NWS National Hurricane Center Miami FL AL132020
700 PM CDT Wed Aug 26 2020

...WINDS INCREASING AS EXTREMELY DANGEROUS HURRICANE LAURA TAKES AIM
AT THE NORTHWEST GULF COAST...
...CATASTROPHIC STORM SURGE, EXTREME WINDS, AND FLASH FLOODING
EXPECTED ALONG THE NORTHWEST GULF COAST TONIGHT...

SUMMARY OF 700 PM CDT...0000 UTC...INFORMATION
----------------------------------------------
LOCATION...28.4N 92.9W
ABOUT 120 MI...190 KM S OF LAKE CHARLES LOUISIANA
ABOUT 120 MI...190 KM SSE OF PORT ARTHUR TEXAS
MAXIMUM SUSTAINED WINDS...150 MPH...240 KM/H
PRESENT MOVEMENT...NNW OR 330 DEGREES AT 15 MPH...24 KM/H
MINIMUM CENTRAL PRESSURE...940 MB...27.76 INCHES

WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...
* Freeport Texas to the Mouth of the Mississippi River

A Hurricane Warning is in effect for...
* San Luis Pass Texas to Intracoastal City Louisiana

A Tropical Storm Warning is in effect for...
* Sargent Texas to San Luis Pass
* East of Intracoastal City Louisiana to the Mouth of the
Mississippi River

A Hurricane Watch is in effect for...
* East of Intracoastal City to west of Morgan City Louisiana

A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline in
the indicated locations. For a depiction of areas at risk, please
see the National Weather Service Storm Surge Watch/Warning Graphic,
available at hurricanes.gov. This is a life-threatening situation.
Persons located within these areas should take all necessary
actions to protect life and property from rising water and the
potential for other dangerous conditions. Promptly follow
evacuation and other instructions from local officials.

A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area. Preparations to protect life
and property should be rushed to completion.

A Hurricane Watch means that hurricane conditions are possible
within the watch area.

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.

For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.

DISCUSSION AND OUTLOOK
----------------------
At 700 PM CDT (0000 UTC), the eye of Hurricane Laura was located
near latitude 28.4 North, longitude 92.9 West. Laura is moving
toward the north-northwest near 15 mph (24 km/h). A turn toward the
north is expected overnight, and a northward motion should continue
on Thursday. A northeastward to east-northeastward motion is
expected Thursday night and Friday. On the forecast track, Laura
will approach the upper Texas and southwest Louisiana coasts this
evening and move inland within that area tonight. The center of
Laura is forecast to move over northwestern Louisiana tomorrow,
across Arkansas Thursday night, and over the mid-Mississippi Valley
on Friday.

Reports from a NOAA Hurricane Hunter aircraft indicate that the
maximum sustained winds have increased to near 150 mph (240 km/h)
with higher gusts. Laura is an extremely dangerous category 4
hurricane on the Saffir-Simpson Hurricane Wind Scale. Some
additional strengthening is possible tonight before Laura reaches
the northwest Gulf coast overnight. Rapid weakening is expected
after Laura moves inland.

Hurricane-force winds extend outward up to 60 miles (95 km) from
the center and tropical-storm-force winds extend outward up to 205
miles (335 km). A sustained wind of 48 mph (78 km/h) was recently
reported at Cypremort Point, Louisiana, on Vermilion Bay.

The minimum central pressure estimated from NOAA Hurricane Hunter
aircraft observations is 940 mb (27.76 inches).

HAZARDS AFFECTING LAND
----------------------
Key messages for Laura can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT3 and WMO header WTNT43 KNHC.

Storm surge and tropical-storm-force winds will arrive within the
warning areas well in advance of Laura's center. All preparations
to protect life and property should be rushed to completion in the
next few hours.

STORM SURGE: The combination of a dangerous storm surge and the
tide will cause normally dry areas near the coast to be flooded by
rising waters moving inland from the shoreline. The water could
reach the following heights above ground somewhere in the indicated
areas if the peak surge occurs at the time of high tide...

Johnson Bayou LA to Rockefeller Wildlife Refuge including Calcasieu
Lake...15-20 ft
Sea Rim State Park TX to Johnson Bayou LA including Sabine
Lake...10-15 ft
Rockefeller Wildlife Refuge to Intracoastal City LA...10-15 ft
Intracoastal City LA to Morgan City including Vermilion Bay...8-12
ft
Port Bolivar TX to Sea Rim State Park...6-9 ft
Morgan City LA to Mouth of the Mississippi River...4-7 ft
Freeport TX to Port Bolivar including Galveston Bay...2-4 ft
Mouth of the Mississippi River to Ocean Springs MS including Lake
Borgne...1-3 ft
Lake Pontchartrain and Lake Maurepas...1-3 ft

The deepest water will occur along the immediate coast near and to
the right of the landfall location, where the surge will be
accompanied by large and destructive waves.

Unsurvivable storm surge with large and destructive waves will cause
catastrophic damage from Sea Rim State Park, Texas, to Intracoastal
City, Louisiana, including Calcasieu and Sabine Lakes. This surge
could penetrate up to 40 miles inland from the immediate coastline,
and flood waters will not fully recede for several days after the
storm.

Surge-related flooding depends on the relative timing of the surge
and the tidal cycle, and can vary greatly over short distances. For
information specific to your area, please see products issued by
your local National Weather Service forecast office.

WIND: Hurricane conditions are expected in the hurricane warning
area tonight and Thursday, with catastrophic wind damage expected
where Laura's eyewall moves onshore tonight. Tropical storm
conditions are moving onshore along the coast of Louisiana within
the tropical storm warning area and are expected to spread
northwestward within the warning areas this evening.

Hurricane-force winds and damaging wind gusts are also expected to
spread well inland into portions of eastern Texas and western
Louisiana early Thursday.

RAINFALL: From this evening through Friday, Laura is expected to
produce the following rainfall totals:

Across the northwestern Gulf Coast from far southwest Louisiana and
the Golden Triangle of Southeast Texas: 8 to 12 inches with isolated
totals of 18 inches.

Across central and the rest of western Louisiana into far eastern
Texas: 5 to 10 inches with isolated totals of 15 inches.

Across much of Arkansas: 3 to 7 inches with isolated totals of 10
inches.

This rainfall will cause widespread flash and urban flooding, small
streams and creeks to overflow their banks, and minor to moderate
freshwater river flooding.

By Friday into Saturday, Laura is expected to produce the following
rainfall totals:

Across the mid-Mississippi and portions of the Tennessee Valley,
Lower Ohio Valley, and central Appalachians: 2 to 4 inches with
isolated maximum amounts of 6 inches.

This rainfall may lead to flash and urban flooding and rapid rises
on small streams.

Across the Mid-Atlantic Region: 1 to 3 inches.

TORNADOES: Several tornadoes are expected this evening through
tonight over Louisiana, far southeast Texas, and southwestern
Mississippi. The risk for a few tornadoes will continue into
Thursday across Louisiana, Arkansas, and western Mississippi.

SURF: Swells produced by Laura are affecting the U.S. Gulf coast
from the west coast of Florida to Texas and northeastern Mexico.
These swells are likely to cause life-threatening surf and rip
current conditions. Please consult products from your local
weather office.

NEXT ADVISORY
-------------
Next complete advisory at 1000 PM CDT.

$$
Forecaster Pasch

Hurricane Laura is a dangerous Category 4 hurricane with 150 mph winds as of 10:00 PM CDT. It is a fairly large hurricane with hurricane force winds extending up to 60 miles from the eye. Tropical storm force winds extend up to 205 miles from the eye. Folks, a large hurricane is going to produce monster storm surge. To make matters worse, there is the COVID-19 pandemic. A monster hurricane barreling towards the coast is bad enough, but with COVID-19, it makes it astronomically worse. The coronavirus could spread among evacuees. 2020 is nothing but uncertainties and anxiety. Here is a wind swath map of Laura. It is a GIS file from the NHC. All GIS maps are created from QGIS.

It is a very large hurricane. Hurricane force winds from the northeast to southeast quadrant is 120 miles across! If it goes over land, it will be reduced by 15 percent due to land interaction. It reduces it to 102 miles and is moving at 15 mph. People on the eastern half of Laura could experience hurricane force winds for 7 hours! Hurricane force wind is a scary to hear, especially at night. I have been through hurricane force winds. It is something you never forget. Many are wondering where Hurricane Laura will go. Here is a heat map using points within 300 mile/480 kilometers radius. I used the latest forecast, which is 0000Z, including the GFS ensemble from 1800Z, and 0000Z forecast to create the heat map. The data and intensity forecast are from NCAR-Tropical Cyclone Guidance

Most of the forecast models have it heading to East Texas or Louisiana. I am not going to say where Hurricane Laura will make landfall. It does not matter where it makes landfall as it will produce monster and deadly storm surge far inland. As for how strong Laura will be. Here is an intensity forecast model.

Most forecast models have Hurricane Laura as a Category 4. One has it as a Category 5. I would not be surprised one bit if Hurricane Laura becomes a Category 5 right before landfall. It will be very devastating regardless of Category 4 or 5. Here is a Doppler radar image out of NWS Lake Charles.

Very ominous looking hurricane. It is going to be a very long and frightening night for Louisiana, especially for anyone who has not evacuated.

Laura, The First Major Hurricane Of 2020?

NOAA/NESDIS/STAR GOES ABI BAND 14 OR_ABI-L1b-RadC-M6C14_G16_s20202390226175_e20202390228548_c20202390229081.nc

Hurricane Laura is in the Gulf of Mexico. It has 90 mph winds from the National Hurricane Center (NHC) as of 10:00 PM Central Time. It comes at a time during the COVID-19 pandemic. The satellite presentation suggests that Laura is undergoing intensification. Here is an intensity forecast model. It is from <a href=http://hurricanes.ral.ucar.edu/realtime/plots/northatlantic/2020/al132020/>NCAR-Tropical Cyclone Guidance. It is also where I get where Laura goes.

Many of the forecast models have Laura as a Category 2 hurricane. Some have it as a Category 3 hurricane. Intensity forecast models are unreliable. I would not be surprised if Laura undergoes rapid intensification and becomes a Category 3 or even 4 hurricane. Hurricanes often intensify at night. Here are my reasoning why I think Laura will intensify. The first one is the lack of wind shear. Here is a wind shear map from CIMSS.

Laura is an area that has little wind shear. Wind shear tends to inhibit tropical development as they shear of thunderstorm clouds. Laura has little wind shear to deal with. However, to the north, the wind shear is stronger, which could prevent Laura from intensifying further. However, the water in the Gulf of Mexico are warm. Here is a Tropical Cyclone Heat Potential map of the Gulf of Mexico from NOAA.

The waters are quite warm as it goes deep. The deep warm water makes it favorable for intensification including rapid intensification. Here is a map of Maximum Potential Hurricane Intensity from The Center for Ocean-Land-Atmosphere Studies.

The Western Gulf of Mexico can support a powerful Category 5 hurricane with winds as high as 190 mph! I do not think Laura will be a Category 5 hurricane as conditions have to be near perfect. The conditions for Laura are most likely at Category 3 to 4 hurricane.

Where does Laura go ultimately? Here is a heat map using points within 300 mile/480 kilometers radius. I used the latest forecast, which is 0000Z, including the GFS ensemble from 1800Z, and 0000Z forecast to create the heat map. They are created with QGIS.

Most likely Laura will make landfall somewhere between Southeast Texas to Southwest Louisiana. I am not going to say where exactly because I think that is irresponsible. Anyone in the dark blue to white area of the heat map needs prepare for Laura. I do not like to focus on the central path as hurricanes can wobble and change at the last minute. Also, hurricanes are large and will have an effect regardless of where one is. I think it is the right move to evacuate from coastal areas as storm surge is dangerous. About 500,000 people have evacuated from coastal areas from The Weather Channel.

Officials in some areas in the path of Hurricane Laura worried Tuesday that residents were ignoring evacuation orders, despite predictions that the storm could make landfall as a major Category 3 hurricane with life threatening storm surge, destructive winds and flooding rainfall.

“We are concerned that not enough people are leaving,” Allison Getz, public information officer for Jefferson County, Texas, told weather.com Tuesday.

She said estimates are that 60% of people in Beaumont, the county’s largest city with a population of 118,000, aren’t going anywhere despite a mandatory evacuation order that was issued Monday night.

Similar evacuation orders continued to be announced Tuesday for several communities in southeastern Texas and southern Louisiana.

It is not easy to evacuate with social distancing in place due to the coronavirus. Hurricane Laura makes it more complicated in these trying times. Everyone in Texas and Louisiana need to be prepared for Hurricane Laura. It is going to be a long night tonight and tomorrow night.

Double Trouble In The Gulf Of Mexico

NOAA/NESDIS/STAR GOES ABI BAND 14 OR_ABI-L1b-RadF-M6C14_G16_s20202352000214_e20202352009522_c20202352010008.nc

Or more like triple trouble with the COVID-19 pandemic raging the world. There are two tropical threats as the tropics are heating up, Laura and Marco. This comes as 2020 has already produced 13 storms. It is ahead of the active 2005 season. One difference is that 2005 had 2 major hurricanes by August, Dennis and Emily. We have no major hurricanes so far in 2020. There have been two hurricanes, Hanna and Isaias. It comes at a time with the coronavirus spreading in America and around the world. If you want to get more information about the COVID-19 pandemic, check out my other blog, The Ebola Zone.

Having two tropical cyclones close together makes a complicated forecast. Here are heat map forecast for Laura and Marco. I used the latest forecast, which is 1800Z, including the GFS ensemble from 1200Z, and 1200Z forecast to create the heat map. I got them from NCAR-Tropical Cyclone Guidance. It is also where I get the intensity forecast model. They are heat map using points within 300 mile/480 kilometers radius. They are created with QGIS.

Laura

Marco

Both have Laura and Marco heading to Louisiana by next week. I consider this a low confidence and complex forecast. It is going to depend on how strong Marco is going to be as it heads into the Gulf of Mexico. It also depends on where Laura goes. If Laura goes over Cuba, it will reduce any chance of intensifying until enters the Gulf of Mexico. A weakened Laura is more likely to go westward. I expect the forecast models to change again due to the complex nature of Laura and Marco being close and other weather related factors. Having two tropical cyclones in the Gulf of Mexico is a rarity. It has occurred in 1933 and 1959. I am pretty sure the Gulf of Mexico has had two tropical cyclones at the same time prior to the 20th century.

An even more complicated factor is intensity. How strong will Laura and Marco get?

Laura

Marco

The intensity forecast for Laura has it as a Category 2 hurricane. Some have it as a Category 3 and one has it as a Category 4 hurricane. The intensity for Marco have it as a strong tropical storm to Category 1 hurricane. Two of them have Category 2 hurricane. Intensity forecast models are unreliable. I am not going to put much stock in them. I would not be surprised if Laura and Marco undergo rapid intensification as they are in the Gulf of Mexico.

As to where Laura and Marco go, that is going to be yet determined. I think it will change again. I consider the forecast low confidence regardless of what forecast model it is be it GFS, EURO, ICON, or Canadian. Until then, we all need to keep an eye on Laura and Marco. The tropics are just starting to heat up.

Hanna, The First Hurricane Of 2020?

NOAA/NESDIS/STAR GOES ABI BAND 14 OR_ABI-L1b-RadC-M6C14_G16_s20202070216208_e20202070218581_c20202070219114.nc

There is Tropical Storm Hanna, which is in the Gulf of Mexico. It is an intensifying tropical storm with an eye developing. Here is the 10:00 PM CDT advisory from the National Hurricane Center.

000
WTNT33 KNHC 250248
TCPAT3

BULLETIN
Tropical Storm Hanna Advisory Number 9
NWS National Hurricane Center Miami FL AL082020
1000 PM CDT Fri Jul 24 2020

…NOAA HURRICANE HUNTERS INDICATE THAT HANNA IS STRENGTHENING…
…EXPECTED TO MAKE LANDFALL AS A HURRICANE TOMORROW IN SOUTHERN
TEXAS…

SUMMARY OF 1000 PM CDT…0300 UTC…INFORMATION
———————————————–
LOCATION…27.1N 94.8W
ABOUT 165 MI…270 KM ESE OF CORPUS CHRISTI TEXAS
ABOUT 165 MI…265 KM ENE OF PORT MANSFIELD TEXAS
MAXIMUM SUSTAINED WINDS…65 MPH…100 KM/H
PRESENT MOVEMENT…W OR 270 DEGREES AT 8 MPH…13 KM/H
MINIMUM CENTRAL PRESSURE…992 MB…29.30 INCHES

WATCHES AND WARNINGS
——————–
CHANGES WITH THIS ADVISORY:

The Hurricane Warning has been extended southward to Port Mansfield
Texas.

The Tropical Storm Warning has been extended northward to High
Island Texas.

The government of Mexico has issued a Tropical Storm Warning north
of Barra el Mezquital to the Mouth of Rio Grande.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for…
* Baffin Bay to Sargent Texas

A Hurricane Warning is in effect for…
* Port Mansfield to Mesquite Bay Texas

A Tropical Storm Warning is in effect for…
* Barra el Mezquital Mexico to Port Mansfield Texas
* Mesquite Bay to High Island Texas

A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 24 hours in the indicated locations. For a
depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
hurricanes.gov. This is a life-threatening situation. Persons
located within these areas should take all necessary actions to
protect life and property from rising water and the potential for
other dangerous conditions. Promptly follow evacuation and other
instructions from local officials.

A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area, in this case within the next 24
hours. Preparations to protect life and property should be rushed
to completion.

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within
the next 24 hours.

Interests elsewhere along the Texas and Louisiana coasts should
monitor the progress of Hanna. Interests in northeastern Mexico
should also monitor the progress of this system.

For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
national meteorological service.

DISCUSSION AND OUTLOOK
———————-
At 1000 PM CDT (0300 UTC), the center of Tropical Storm Hanna was
located near latitude 27.1 North, longitude 94.8 West. Hanna is
moving toward the west near 8 mph (13 km/h) and this motion should
continue through Saturday morning. A gradual turn toward the
west-southwest is expected Saturday night and that motion should
continue through Sunday. On the forecast track, the center of Hanna
should make landfall along the Texas coast within the hurricane
warning area Saturday afternoon or early evening.

Maximum sustained winds are near 65 mph (100 km/h) with higher
gusts. Additional strengthening is forecast, and Hanna is expected
to become a hurricane before the cyclone makes landfall on
Saturday. Rapid weakening is expected after Hanna moves inland.

Tropical-storm-force winds extend outward up to 80 miles (130 km)
from the center.

The estimated minimum central pressure based on data from the NOAA
Hurricane Hunters is 992 mb (29.30 inches).

HAZARDS AFFECTING LAND
———————-
Key messages for Hanna can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT3 and WMO header WTNT43 KNHC.

STORM SURGE: The combination of a dangerous storm surge and the
tide will cause normally dry areas near the coast to be flooded by
rising waters moving inland from the shoreline. The water could
reach the following heights above ground somewhere in the indicated
areas if the peak surge occurs at the time of high tide…

Baffin Bay to Sargent TX…including Corpus Christi Bay, Copano Bay,
Aransas Bay, San Antonio Bay, and Matagorda Bay…3 to 5 ft
Mouth of the Rio Grande to Baffin Bay TX…1 to 3 ft
North of Sargent to High Island TX…including Galveston Bay…1 to
2 ft

The deepest water will occur along the immediate coast near and to
the right of the landfall location. Surge-related flooding depends
on the relative timing of the surge and the tidal cycle, and can
vary greatly over short distances. For information specific to your
area, please see products issued by your local National Weather
Service forecast office.

WIND: Hurricane conditions are expected in the warning area
Saturday afternoon. Tropical storm conditions are expected to begin
in the warning area by Saturday morning.

RAINFALL: Hanna is expected to produce 5 to 10 inches of rain with
isolated maximum totals of 15 inches through Sunday night in south
Texas and into the Mexican states of Coahuila, Nuevo Leon, and
northern Tamaulipas. This rain may result in life-threatening flash
flooding, rapid rises on small streams, and isolated minor to
moderate river flooding in south Texas.

Along the upper Texas and Louisiana coasts 3 to 5 inches of rain is
expected.

SURF: Swells generated by Hanna are expected to increase and affect
much of the Texas and Louisiana coasts during the next couple of
days. These swells are likely to cause life-threatening surf and rip
current conditions. Please consult products from your local weather
office.

TORNADOES: A brief tornado or two will be possible across portions
of the Texas coast, beginning Saturday morning.

NEXT ADVISORY
————-
Next intermediate advisory at 100 AM CDT.
Next complete advisory at 400 AM CDT.

$$
Forecaster Cangialosi

Hanna is getting stronger with 65 mph winds and getting larger. How strong will Hanna get and where will it make landfall? Here is an intensity forecast model and where it goes from NCAR-Tropical Cyclone Guidance. Let’s look at the intensity forecast model.

Most of the intensity forecast model have Hanna as a tropical storm. A couple of them have it intensifying into a Category 1 hurricane. I would not be surprised if Hanna became a Category 1 or even Category 2 hurricane. Here are forecast models from EURO, GFS, Canadian (CMC), and Navy Global Environmental Model (NAVGEM). They are from Tropical Tidbits.

EURO

GFS

CMC

NAVGEM

The EURO and Canadian are not recent. The GFS is 30 hours into the forecast. The GFS has Hanna stronger after it makes landfall. The NAVGEM keeps it as a tropical storm right before landfall. Regardless of what forecast models have, I think Hanna will become a Category 1 or even 2 hurricane. The satellite image of Hanna does show intensification due to the more circular shape of the storm. Tropical storms tend to intensify at night. I would not be surprised if we wake up to Hurricane Hanna. If that is the case, Hanna would be the first hurricane of the 2020 Atlantic Season. First hurricane during the COVID-19 pandemic. Here is the forecast of where Hanna will go.

Most of the forecast model have Hanna making landfall on South Texas, possibly around the Corpus Christi area on Saturday. Many forecast models have Hanna going southwestward towards Mexico. One forecast model has it going northward towards Oklahoma. That would be a good thing as North Texas and Texas Panhandle are in a drought. They can use the rain for sure.

Hurricane Hanna adds a lot of uncertainty on top of the COVID-19 pandemic. It continues to ravage the world. If you want to read more about COVID-19 pandemic, check out my other blog, The Ebola Zone.

April 2020 Hurricane Season Forecast

The world is dealing with the COVID-19 pandemic. Many nations are affected by the pandemic as it has sickened many. Hurricane season is not on anyone’s mind as many are staying home and social distancing to curb the spread of the coronavirus. Hurricane Season is coming as it starts on June 1, 2020. Here are other forecasts.

Colorado State University
16/8/4 ACE: 150

Joe Bastardi (Weather Bell)
14 to 20 Storms/7 to 11 Hurricanes/3 to 6 Major Hurricanes ACE: 145 to 195

Tropical Storm Risk
16/8/3 ACE: 130

Accuweather
14 to 18 Storms/7 to 9 Hurricanes/2 to 4 Major Hurricanes

Crown Weather
15/8/3

The Weather Channel
18/9/4

Weather Tiger
16/8/4

University of Arizona
19/10/5 ACE: 163

North Carolina University
18 to 22 Storms/8 to 11 Hurricanes/3 to 5 Major Hurricanes

They are all predicting an active season.

The analog years I am using are in which El Nino started late and is forecasted to be El Nino for the rest of the year to next year. Obviously, the forecast is uncertain with El Nino or Neutral.

Based on this, the analog years are 1881, 1901, 1937, 1944, 1949, 1979, 1990, 2004, 2013, and 2017. The winter started as Neutral and is forecasted to either go Neutral, La Nina, or El Nino. El Nino is not the only factor. I look at Atlantic Multidecadal Oscillation (AMO), Pacific Decadal Oscillation (PDO), Northeast Pacific Warm Pool (NEPWP), Equatorial Indian Ocean (EIO), Tropical South Atlantic (TSAI), New Zealand Warm Pool (NZWP), Quasi-Biennial Oscillation (QBO), and Atlantic Main Development Region (MDR). Here is the ocean temperature anomaly map. It is from Tropical Tidbits.

Analog Years For 2020 (TS/H/MH ACE ACE/Storm)
1881 7/4/0 59 8.4
1901 13/6/0 99 7.6
1937 11/4/1 66 6.0
1944 14/8/3 104 7.4
1949 16/7/2 96 6.0
1979 9/5/2 93 10.3
1990 14/8/1 97 6.9
2004 15/9/6 227 15.1
2013 14/2/0 36 2.6
2017 17/10/6 225 13.2

All of the seasons had major hurricane, except 1881, 1901, and 2013. However, I consider 1881 and 1901 suspect because of no satellite. That includes any season before satellite. The most active is 2017 with 17 named storms, 10 hurricanes, and 6 major hurricanes. The least active is 2013 which only had 2 hurricanes and no major hurricanes.

Here are notable storms in the analog seasons.

1881
Hurricane #5 or Georgia Hurricane of 1881

1901
Tropical Storm #2
Hurricane #4 or 1901 Louisiana Hurricane

1937
Tropical Storm #3

1944
Hurricane #7 or 1944 Great Atlantic Hurricane
Hurricane #13 or 1944 Cuba–Florida hurricane

1949
Hurricane #2 or Florida Hurricane of 1949
Hurricane #11 or Texas Hurricane of 1949

1979
Tropical Storm Claudette
Hurricane David
Hurricane Frederic

1990
Hurricane Diana
Hurricane Klaus

2004
Hurricane Charley
Hurricane Frances
Hurricane Ivan
Hurricane Jeanne

2013
Hurricane Ingrid

2017
Hurricane Harvey
Hurricane Irma
Hurricane Maria

Many of these notable storms in analog seasons were prodigious rainmakers like Claudette and Harvey. Claudette dumped 43 inches of rain in 24 hours near Alvin. It was the highest 24 hour total in American and broken in Waipā Garden, Hawaii on April 14-15, 2018. The rain event dumped nearly 50 inches of rain in 24 hours! Harvey dumped heavy rain over a large area and led to massive flooding. Many areas saw 30 to 40 inches of rain with totals as high as 70 inches! Some were intense like David, Ivan, Irma, and Maria, which were Category 5 hurricanes. Jeanne and Maria are some of the deadliest Atlantic hurricanes, which claimed over 3,000 lives. I am not suggesting 2020 will see something like Claudette, David, Ivan, Jeanne, Harvey, Irma, and Maria.

Here is a heat map of analog seasons. It is based on 300 mile radius from the storms. It was created with QGIS. The hurricane data came from International Best Track Archive for Climate Stewardship (IBTrACS).

The heat map has Gulf of Mexico, Southeastern US, and Caribbean. However, when you look at the whole basin, everyone is at risk for landfall. I never make landfall predictions as I strongly object to doing landfall forecasts this early. Everyone is at equal risk.

Here is a statistical analysis of analog seasons vs all season. It was done with PSPP..

Analog
Mean
13/6.3/2.1
13/6/2 (Rounded Up)

Median
14/6.5/1.5
14/7/2 (Rounded Up)

Standard Deviation
3.13/2.54/2.28

ACE
Mean
110.2

Median
96.5

Standard Deviation
64.75

ACE/Storm
Mean
8.37

Median
7.52

Standard Deviation
3.68

95% Confidence Interval
Tropical Storm
Lower Bound: 10.76
Upper Bound: 15.24

Hurricane
Lower Bound: 4.48
Upper Bound: 8.12

Major Hurricane
Lower Bound: 0.47
Upper Bound: 3.73

ACE
Lower Bound: 63.88
Upper Bound: 156.52

ACE/Storm
Lower Bound: 5.74
Upper Bound: 11

How do analog seasons compare as a whole. Statistics from 1870 to 2019.

Mean
9.99/5.55/2.07
10/6/2

Median
10/5/2

Standard Deviation
4.24/2.63/1.68

ACE
Mean
93.59

Median
84

Standard Deviation
54.45

ACE/Storm
Mean
9.39

Median
8.67

Standard Deviation
4.01

95% Confidence Interval
Tropical Storm
Lower Bound: 9.3
Upper Bound: 10.68

Hurricane
Lower Bound: 5.13
Upper Bound: 5.98

Major Hurricane
Lower Bound: 1.8
Upper Bound: 2.34

ACE
Lower Bound: 84.8
Upper Bound: 102.37

ACE/Storm
Lower Bound: 8.74
Upper Bound: 10.04

The 95% Confidence Interval for analog season vs the whole season is wide. Analog seasons could either be inactive or active. Analog seasons are above average compared to the whole season.

What is my prediction for this season?
12 to 20 named storms, likely 16 named storms
6 to 12 hurricanes, likely 9 hurricanes
2 to 6 major hurricanes with 4 major hurricanes
ACE is 120 to 220 with ACE likely of 140 to 200

Let’s see how my April 2019 hurricane forecast compare to the actual 2019 season.

9 to 15 named storms, likely 12 named storms
5 to 10 hurricanes, likely 7 hurricanes
1 to 4 major hurricanes with 2 major hurricanes
ACE is 60 to 120 with ACE likely of 70 to 110

Colorado State University
13/5/2 ACE: 80

Joe Bastardi (Weather Bell)
10 to 15 Storms/4 to 7 Hurricanes/0 to 2 Major Hurricanes ACE: 60 to 110

Tropical Storm Risk
12/5/2 ACE: 81

Accuweather
10/5/3

Crown Weather
10/6/3

The Weather Channel
12/6/2

2019 Actual Number
18 Named Storms
6 Hurricanes
3 Major Hurricanes
131 ACE

Many including myself got the forecast off. The 2019 Hurricane Season was more active than forecasted. Most got the number of hurricanes and major hurricanes correct. The ACE was under, compared to the actual ACE. There is always room for improvement.

Regardless of forecast, I think 2020 could be an interesting hurricane season. It could be jarring with the COVID-19 pandemic going on with social distancing likely in place even with shelter in place being slowly phased out. It could flare up in the summer. I do not know as viruses are unpredictable like weather. If you want to read more about the COVID-19 pandemic, you can check out my other blog, The Ebola Zone.

2019-2020 Winter Forecast

It is this time again. Winter is here and Christmas is coming. Christmas comes sooner and sooner every year. I cannot believe that 2010’s is about to enter memory lane as we enter the 2020s. 2000 felt like yesterday as we feared Y2K bug, but nothing serious happened. The new Millennium start in 2001. In many ways, the new Millennium started on September 11, 2001 when Al-Qaeda terrorists flew into the World Trade Center, Pentagon, and near Shanksville claiming 3,000 lives.

We currently have a warm neutral equatorial Pacific. It is hard to say if El Nino is developing or not. However, the water off the coast of Alaska is very warm, which is a factor I have taken into account. It is dubbed “The Blob” or I call it the Northeast Pacific Warm Pool. What will the Winter of 2019-2020 be like? I will start with winters that have warm neutral equatorial Pacific.
1880-1881
1883-1884
1884-1885
1885-1886
1891-1892
1895-1896
1900-1901
1919-1920
1923-1924
1946-1947
1952-1953
1953-1954
1958-1959
1978-1979
1989-1990
1990-1991
1993-1994
2003-2004

Here is a map of the most recent sea surface temperature anomaly. It is as of 12/23/2019.

Here is annotated version.

I will also look at the ocean temperature as they are factors besides El Nino. This will help narrow it down to which winter analogs they are. They are Tripole Index for the Interdecadal Pacific Oscillation (TPI IPO), Pacific Decadal Oscillation (PDO), Atlantic Multidecadal Oscillation (AMO), Northeast Pacific Warm Pool (NEPWP), Equatorial Indian Ocean (EIOI), Roaring Forties (R40I)/Southern Ocean, and Quasi-Biennial Oscillation (QBO). The rest that are not linked, please click on Climate Indices. Not all El Nino winters are the same.

Here is the chart of analogs.

Year ENSO TPI IPO PDO AMO NEPWP EIOI DMI R40I QBO Total Note
1880-1881 1 1 1 1 4 No QBO Data
1883-1884 1 1 1 1 4 No QBO Data
1884-1885 1 1 1 1 4 No QBO Data
1885-1886 1 1 1 3 No QBO Data
1891-1892 1 1 1 3 No QBO Data
1895-1896 1 1 1 3 No QBO Data
1900-1901 1 1 2 No QBO Data
1919-1920 1 1 2 No QBO Data
1923-1924 1 1 2 No QBO Data
1946-1947 1 1 1 1 4 No QBO Data
1952-1953 1 1 1 1 4
1953-1954 1 1 1 3
1958-1959 1 1 1 3
1978-1979 1 1 1 1 1 1 6
1989-1990 1 1 1 1 1 1 1 7
1990-1991 1 1 1 1 1 1 1 1 8
1993-1994 1 1 1 1 1 1 6
2003-2004 1 1 1 1 1 5

I narrow down to these analog winters.
1978-1979
1989-1990
1990-1991
1993-1994
2003-2004

I will use those winters for the analog winter forecast. Let’s look at the upper air pattern at the 500 millibar level or 18,000 feet. All the maps are from 20th Century Reanalysis Monthly Composites.

There is ridging south of Alaska, Arctic Ocean, and Greenland. The ridging over Gulf Of Alaska and Far East Russia are negative East Pacific Oscillation (EPO) and West Pacific Oscillation (WPO). They are the North Pacific equivalent of North Atlantic Oscillation (NAO). Ridging over Greenland is a negative NAO. A negative NAO, EPO, and WPO are more favorable for cold winters. The ridging allows cold air to be shunted southward. The areas under the ridging are warmer as a result. All the cold air went to a different area.

What will the temperature be like at the surface?

Most of North America and Siberia are cold. Southeast Texas winter temperature is not abnormally cold or warm, but within average. Regardless, this suggests this winter could be a cold one. Greenland, Mongolia, and Korea are warmer than normal, but not overtly warm.

Let’s look at temperature at 850 millibars or 5,000 feet.

The air is cold at 5,000 feet over Canada and Siberia. It is not abnormally cold over Texas. The reason I am including this is if is freezing cold above the surface, it increases the chance for snow in the winter. One can have freezing cold at the surface, but warm above ground. That leads to freezing rain or sleet. For snow to form, the upper atmosphere needs to be cold. Snowfall occurs if the surface is not cold because the atmosphere is freezing. It is above that counts. Often when it snows, the surface is not really that cold.

Lastly, let’s look at precipitation rate.

The Western US looks to be dry. The wettest looks to be around Hawaii, Southeastern US, and Western Europe. Houston area could see a wetter than normal winter, but not overtly wet winter. The last time the Northeast Pacific Warm Pool was warm was in 2013-2014. There a severe drought that plagued California. The warm Northeast Pacific Warm Pool contributed to the Ridiculously Resilient Ridge.

How were winters like in these analog years?

1978-1979
Coldest winter recorded in America. The late 1970s and just the 1970s was cold in general. It was cold all over the Lower 48.

1989-1990
The winter to remember with December 1989 freeze. Many areas set record lows, which are yet to be broken as of 2019. Houston saw a low of 7°F on December 22, 1989! Houston has seen single digit temperatures in February 1899 twice and January 1930. Houston presumably had single digits in January 1886. The epic freeze affected east of the Rocky Mountains. After the cold blast, winter was mild throughout America. The December 1989 freeze ranks up there with January 1886, February 1895, February 1899, and December 1983.

1990-1991
Almost a year after the epic December 1989 freeze, America sees another freeze. It mainly affects the Western US. It is one of the worst freeze for California. Houston area sees another freeze. Western Europe had a cold winter, particularly United Kingdom. Many areas in Europe saw heavy snow.

1993-1994
The cold blast on January 1994 that affected the Eastern US. Houston saw snow in February 1994. There was an ice storm in February 1994.

2003-2004
The December 2003 Nor’easter that dumped heavy snow throughout the Northeastern US. It is one of the largest early season Nor’easter. Another Nor’easter dubbed White Juan ravages the Eastern US and Maritime Provinces of Canada in February 2004. It dumped heavy snow of up to 40 inches.

What these winters have in common is there was a huge cold blast. Also, the winters are among the coldest on record. Does this mean we will see another December 1989 freeze this winter or a warm winter after the December 1989 cold blast? No, but we could see a cold blast or warm winter this winter.

I think this winter is looking to be a cold winter. I would not be surprised to hear of a major cold blast this coming winter or snow fall. I could see major winter storms happening on top potent cold waves.

Deja Vu

It is deja vu. Just two years earlier, Harvey ravaged Texas with heavy rain. Today, it is Imelda. Heavy rain fell east of the Houston area, mainly in Liberty, Chambers, and Beaumont area. It was again heavy rain at night. Some areas got 6 inches of rain in one hour! That is really intense on the same level as Harvey. The rains kept falling and falling well into the night and early morning. Here is a rainfall map I got from Advanced Hydrologic Prediction Service (AHPS) and used QGIS. The rainfall is from 12Z to 12Z, which from yesterday to today. 12Z is 7:00 AM CDT.

The 24 hour total is over 30 inches of rain. Not surprised as the rains were very intense, especially around Winnie in Chambers County.

Here is a two day total since 7:00 AM since September 17, 2019.

A large area got at least 20 inches of rain from coastal Texas to east of Houston. The highest total is nearly 36 inches. However, over 43 inches of rain fell near Fannett in the past three days.

If that is true, Imelda is one of the wettest tropical system in America. Here is the list of wettest tropical systems in America from list of wettest tropical cyclones in America.

1.) Harvey 2017 60.58
2.) Lane 2018 58.00
3.) Hiki 1950 52.00
4.) Amelia 1978 48.00
5.) Easy 1950 45.20
6.) Claudette 1979 45.00
7.) Imelda 2019 43.15
8.) TD 15 1970 41.68
9.) Allison 2001 40.68
10.) September 1921 Hurricane 39.71

Six of the ten are in Texas. Two are in Hawaii, and one are in Florida and Puerto Rico. Hawaii and Puerto Rico have mountainous terrain, which is more favorable for heavy rain. Some areas in Texas are hilly like in Central Texas with the case of Amelia. It is likely that over 50 inches of rain fell during Amelia based on this below.

Roland Manatt, in the Rocky Creek drainage along the divide between the Medina and Guadalupe Rivers, 8 mi northwest of Medina, measured 48 in. of rain in 52 hrs. He began measuring in a vegetable can which rapidly became tiresome in the sometimes over 4 in/hr intensities. He switched to a large fruit juice can and stayed awake over 2 days and nights measuring the rain. He said he dozed off a few times and let the can overflow – so the 48 in. is to be considered a lower limit.

Same goes with the 1921 flood as there were less weather stations and people back then to measure rain. This would also apply with the 1899 Brazos Flood as heavy rain fell over a large area in Texas. The 1899 flood was caused by Tropical Storm #1, which was a “weak” one like Imelda.

Here is a rainfall report from NWS Lake Charles.

000
SXUS54 KFWR 191531
HYDLCH

Rainfall Reports for the Lake Charles Hydrologic Service Area
National Weather Service...West Gulf RFC...Fort Worth, TX
1029 AM CDT Thu Sep 19 2019

Precipitation for the 24 hours ending about 7 a.m. Thursday September 19, 2019

Golden Triangle-Beaumont/Port Arthur/Orange...

Beaumont - Neches River 19.80 Beaumont-SE Texas Rgnl Arpt 13.70
Nederland 1.8 W 11.00 Vidor 7.2 N 10.00
Bridge City 1.3 NW 7.07 Port Arthur 3 NNE 5.03
Orange 3 SW - County Airport 4.81

Remainder of Lake Charles HSA...

Beaumont 10 W 19.43 Lumberton 2 NNE 10.34
Kirbyville 15 SSE - RAWS Site 7.56 Evadale 1 W - Neches River 6.13
Fred 6.05 McFadden 5.71
Kountze 5.24 Kountze 1.1 S 5.15
Jasper 3 SW 4.69 Kountze 4 NE - Village Creek 4.65
Spurger 6.2 S 4.45 Spurger 1 NE 4.15
Woodville 2 W 4.00 Town Bluff 2 NE-B A Steinhagen 3.93
Woodville 7.2 S 3.92 Warren 7 SE -Southern Rough 3.92
Lake Charles 4.8 SSE 3.90 Woodville - Harmony Station 3.75
Woodville 7 ENE 3.67 Woodville 2 SE 3.67
Chester 1 SE 3.60 Jasper 15 NNW - Sam Rayburn Rv 3.43
Colmesneil 7 ESE 3.23 Iowa 9.7 NNW 3.05
Bon Wier - Sabine River 2.74 Ragley 5 SE 2.72
Hackberry 8 SSW 2.56 Sulphur 2.2 E 2.53
Bell City 13 SW 2.20 Moss Bluff 2.15
Lake Charles 7 NW-SH Jones SP 2.10 De Ridder-Beauregard Par Arpt 2.05
Lake Charles - Regnl Airport 2.05 Lake Charles - Calcasieu River 2.05
Lake Charles 2 N 1.95 Lake Charles 11.5 SSW 1.91
Grand Chenier 10 NE 1.70 Dry Creek 8 NW 1.65
Grand Chenier 9 ESE 1.52 Jennings 1.12
Jennings 1 NW - Airport 1.10 Leesville 6 SSW 0.93
Bunkie 0.90 Abbeville 16 SSW 0.85
Kaplan 1.6 SSE 0.84 Abbeville 9.9 SW 0.83
Jasper 3 SSW 0.77 Marksville 1 W - FSA 0.75
Jeanerette 5 NW 0.68 Crowley 2 NE 0.66
Rayne 1 W 0.63 Carencro 0.55
Carencro 3.9 ENE 0.55 Leesville 0.50
Lafayette - Airport 0.46 Oberlin 0.40
Abbeville 1 E 0.25 Bunkie 0.3 WSW 0.24
Alexandria - England AFB 0.22 Grand Coteau 2.7 E 0.22
Ruby 3 W - Red River L & Dam 2 0.20 Alexandria - Regional Airport 0.16
Opelousas 1 ESE - FSA 0.16 Alexandria - Power Plant 0.08
St. Martinville 0.2 S 0.07 Opelousas 2 NW - Ahart Field 0.07
Morgan City 2 ESE 0.03

$$

Here is a rainfall report from NWS Houston.

034
SXUS54 KFWR 191531
HYDHGX

Rainfall Reports for the Houston / Galveston Hydrologic Service Area
National Weather Service...West Gulf RFC...Fort Worth, TX
1029 AM CDT Thu Sep 19 2019

Precipitation for the 24 hours ending about 7 a.m. Thursday September 19, 2019

Metro Houston...

Roman Forest 1.9 ENE 16.88 Conroe 0.7 E 12.25
Conroe - Montgomery Co Airport 11.05 Cleveland 3.6 S 10.93
Conroe 2.1 SSW 9.20 Conroe 1.1 W 5.00
Spring 5.7 N 4.36 Cloverleaf 1.7 W 3.86
Conroe 4 S - W Fk San Jacinto 2.86 Spring 4 N 2.80
Conroe 2.38 Pasadena 4.4 WNW 2.35
Spring 1.3 NW 2.33 Houston - Ship Channel Bridge 2.16
Sheldon - Lake Houston 2.08 Spring 3 NW - Panther Branch 2.08
The Woodlands - Panther Branch 2.02 Montgomery 2.00
Houston 2.1 NNE 1.80 Montgomery 2.6 NE 1.79
Houston - Hobby Airport 1.61 The Woodlands 2.8 N 1.56
Houston Westbury 1.44 Houston 5.9 SW 1.44
Houston - Bush Intl Airport 1.39 Houston 1.4 NE 1.39
The Woodlands 3.7 NNW 1.36 South Houston 3 S 1.32
Dickinson 0.5 NNE 1.31 Houston 2.1 SSW 1.27
The Woodlands 4.6 NNW 1.25 Tomball 2.7 ENE 1.23
Webster 3.9 NNW 1.22 Houston - Buffalo Bayou 1.22
Bunker Hill Village 3.6 NNW 1.21 Webster 2.8 NNW 1.20
West University Place 0.4 WNW 1.18 Hilshire Village 2.7 ENE 1.16
Spring Valley 2.7 NW 1.15 Montgomery 4 N 1.15
Pinehurst 3.8 SE 1.15 Katy 4.5 S 1.14
League City 0.9 WNW 1.02 Houston - Cole Ck at Diehl Rd 1.00
Pearland-Coward`s Ck@Cloverdal 1.00 Dickinson 1.4 W 0.97
Houston - Hooks Memorial Arpt 0.95 Friendswood 2.6 NE 0.95
League City 3.6 ENE 0.94 Pearland - Regional Airport 0.91
Houston - Keegans Bayou 0.91 Bunker Hill Village 4.4 WSW 0.90
Friendswood 2.5 NNE 0.90 Houston 4.7 WNW 0.88
Nassau Bay 0.9 ENE 0.81 Mission Bend 0.8 N 0.80
Hedwig Village 1.1 NNW 0.80 Kemah 0.2 WNW 0.79
Alvin 1.6 SW 0.77 The Woodlands 5.8 NW 0.75
Katy 3 SSE - Buffalo Bayou 0.73 League City 2.7 NE 0.69
The Woodlands 5.5 NW 0.66 Tomball 4.6 SSW 0.63
Missouri City 5.1 SSE 0.58 Sugar Land 1 W 0.52
Fulshear - Buffalo Bayou 0.51 Pearland 7.4 W 0.50
Arcola - HOU Southwest Airport 0.47 Magnolia 2.8 S 0.46
Katy 7.3 SSE 0.43 Sugar Land 3 SSE 0.42
Sugar Land Mncpl Airport 0.40 Manvel 3.6 S 0.40
Dobbin 1 NE - Lake Creek 0.37 Addicks - Langham Creek 0.31
Jersey Village 6.4 W 0.30 Missouri City 1.7 SSW 0.26
Richmond 4.4 NNE 0.22 Richmond 4.6 SE 0.18
Houston - IH 10 @ SH 6 0.12 Richmond 4.9 NNE 0.10
Richmond 2.9 NE 0.09 Richmond - Brazos River 0.06
Richmond 2.3 SE 0.05 Richmond 4.6 N 0.04
Barker - Barker Reservoir 0.01

Bryan/College Station Area...

College Station 6.4 ENE 0.41 Bryan 3.5 NNW 0.27
College Station 3 SE - Bee Ck 0.26 College Station 2 SSE 0.20
College Station 10.4 ENE 0.18 College Station 3 SE - Bee Ck 0.17
College Station 4.5 SW 0.12 Bryan 3.9 SSW 0.12
Bryan 3 NE- Coulter Field 0.10 Bryan 3.8 SSW 0.10
Shiro -Gibbons Creek Reservoir 0.09 College Station-Easterwood Apt 0.09
Madisonville 0.04 Gause 2.5 W 0.03
Bryan 7.1 N 0.02 Milano 5.2 ENE 0.02
Brenham 8 E 0.02 Brenham 0.7 E 0.02
Lyons - Davidson Creek 0.01 Normangee 9 SW - Navasota Rvr 0.01
Chappell Hill 1 NW 0.01

Galveston and Coastal Areas...

Galveston 6.4 NE 4.55 Freeport - Old Brazos River 4.53
Galveston 5.6 NE 3.78 Galveston - Scholes Airport 3.56
High Island 8 NNW - Anahuac 3.55 Galveston 8.3 NE 2.88
Texas City 3.8 E 1.23 La Marque 3.9 SE 1.15
Lake Jackson 1.6 E 0.92 Santa Fe 0.7 S 0.76
Alvin 6 SW - Chocolate Bayou 0.76 Sargent 1 ENE 0.73
West Columbia 1 ESE 0.65 Hitchcock 1.6 NNW 0.62
Angleton - Brazoria Co Arpt 0.52 Brazoria NWR 0.50
El Campo 4.9 SSE 0.35 Damon 1 NNW 0.28
Bay City - Colorado River 0.21 Edna 3.8 NNW 0.20
Ganado 1.5 W 0.16 Palacios 11.5 NNE 0.01

Remainder of Houston / Galveston HSA...

Dayton 1.1 SE 11.00 Dayton 0.2 E 9.02
Romayor - Trinity River 4.76 Cleveland 2 S 2.12
Livingston 2 W-Long King Creek 2.12 Livingston 0.5 E 2.08
El Campo 2.7 NW 1.77 El Campo 2 NW 1.66
El Campo 1 NW 1.24 Wharton 1.4 ESE 1.13
Wharton 0.3 E 1.09 Glen Flora - Colorado River 1.04
Wharton 3.1 NE 0.99 Oakhurst 3.6 SSE 0.90
Wharton - Colorado River 0.89 Lane City - Colorado River 0.80
Dodge 1.6 S 0.69 Ratcliff 0.65
Kennard 7 N 0.43 Livingston 13.4 NW 0.43
Livingston 8.4 W 0.37 Crockett 1.8 NNE 0.34
Point Blank 0.7 ESE 0.32 Crockett 10.5 SE 0.24
Onalaska 0.6 WSW 0.22 Trinity 2.9 E 0.22
Willis 5 NW - Huntsville RAWS 0.21 Trinity 3.7 E 0.20
Crockett 0.19 Huntsville 4.8 NNW 0.19
Huntsville - Municipal Airport 0.19 Huntsville 1.3 SSE 0.16
Trinity 5.1 NW 0.11 Yoakum - Ag Exp Station 0.11
Huntsville 11.5 WSW 0.09 Riverside - Trinity River 0.08
Sealy 0.3 WNW 0.07 East Bernard - San Bernard Rvr 0.05
Brenham 0.04 Bellville 0.9 ENE 0.02
Brenham 1.3 ESE 0.02 Attwater NWR near Lafitte 0.01
Sealy 10 SW - San Bernard Rvr 0.01 Hempstead - Brazos River 0.01
San Felipe 1 WNW 0.01 Bellville 6.5 NNE Trace

$$

Since there is a sense of deja vu with Harvey, here is a rainfall map of Harvey. It is from AHPS. It is from 7:00 AM August 25, 2017 to 7:00 AM September 1, 2017.

A large area got 30 to 40 inches of rain. The highest is nearly 55 inches in the map. The highest rainfall is 65 to 70 inches of rain from National Hurricane Center.

It is unfortunate many who were flooded by Harvey are now flooded by Imelda. The sense of deja vu for many. I hope for better days ahead.

What Does It For Tonight For Imelda

Last night was very rainy for the coastal areas. Many areas saw 6 to 12 inches of rain. The highest is nearly 22 inches at Sargent! Most of the rain was south of the center of Imelda. Generally, the heaviest rains tend to be on the east side of the center. Here is a Doppler radar image from NWS Houston.

Here is a rainfall report.

000
SXUS54 KFWR 181527
HYDHGX

Rainfall Reports for the Houston / Galveston Hydrologic Service Area
National Weather Service...West Gulf RFC...Fort Worth, TX
1027 AM CDT Wed Sep 18 2019

Precipitation for the 24 hours ending about 7 a.m. Wednesday September 18, 2019

Metro Houston...

Alvin 1.6 SW 9.10 Friendswood 2.5 NNE 7.97
Friendswood 2.6 NE 7.16 South Houston 3 S 6.93
League City 0.9 WNW 6.40 Pearland - Regional Airport 6.34
League City 3.5 W 6.30 Friendswood 1 SE 6.19
Dickinson 4.4 WSW 6.05 Sheldon - Lake Houston 5.68
Houston - Hobby Airport 5.38 Dickinson 1.4 W 5.08
Manvel 3.6 S 5.02 Dickinson 0.5 NNE 4.83
Kenefick 4 W - Dayton RAWS 4.81 Kemah 0.2 WNW 4.80
Missouri City 5.1 SSE 4.78 League City 2.7 NE 4.78
Webster 2.8 NNW 4.52 Houston 2.1 SSW 4.32
Pasadena 4.4 WNW 4.06 Bacliff 0.5 SSE 4.05
Roman Forest 1.9 ENE 3.93 Cleveland 3.6 S 3.86
Webster 3.9 NNW 3.81 Nassau Bay 0.9 ENE 3.66
West University Place 0.4 WNW 3.51 Cloverleaf 1.7 W 3.43
Houston Westbury 3.42 Houston 5.9 SW 3.39
Hedwig Village 1.1 NNW 3.05 Houston 2.1 NNE 2.88
Houston 4.7 WNW 2.57 Sugar Land 1 W 2.56
Sugar Land 3 SSE 2.54 Hilshire Village 2.7 ENE 2.50
Bunker Hill Village 3.6 NNW 2.46 Cleveland 4 ENE 2.41
Spring Valley 2.7 NW 2.34 Houston - Keegans Bayou 2.32
Houston - Buffalo Bayou 2.30 Houston - Cole Ck at Diehl Rd 2.03
Sugar Land Mncpl Airport 1.94 Missouri City 1.7 SSW 1.87
Bunker Hill Village 4.4 WSW 1.73 Pearland 3.1 E 1.63
Mission Bend 0.8 N 1.59 Houston - IH 10 @ Eldridge 1.48
Richmond 3.4 NE 1.43 Richmond 4.6 SE 1.34
Richmond 2.3 SE 1.34 Richmond 4.4 NNE 1.25
Spring 7.1 WSW 1.24 Richmond 4.9 NNE 1.20
Richmond 2.9 NE 1.18 Spring 4 N 1.18
Houston - Bush Intl Airport 1.15 Spring 1.3 NW 1.13
Richmond - Brazos River 1.10 Mission Bend 5.6 NNW 1.05
Richmond 4.6 N 0.97 Conroe - Montgomery Co Airport 0.86
Spring 5.7 N 0.84 Katy 7.3 SSE 0.82
The Woodlands - Panther Branch 0.80 Conroe 0.7 E 0.80
Fulshear - Buffalo Bayou 0.77 Conroe 0.76
The Woodlands 5.8 NW 0.73 The Woodlands 4.6 NNW 0.73
Tomball 2.7 ENE 0.68 Spring 3 NW - Panther Branch 0.67
Katy 4.5 S 0.63 Houston - Hooks Memorial Arpt 0.60
The Woodlands 5.5 NW 0.60 Jersey Village 6.4 W 0.52
Jersey Village 8.5 NW 0.51 Conroe 4 S - W Fk San Jacinto 0.46
The Woodlands 3.7 NNW 0.45 Addicks - Langham Creek 0.44
Pinehurst 3.8 SE 0.44 Katy 3 SSE - Buffalo Bayou 0.43
Jersey Village 4.6 NW 0.43 Montgomery 4 N 0.40
Tomball 6.2 W 0.37 Hockley 2.5 ESE 0.33
Magnolia 2.8 S 0.29 Tomball 4.6 SSW 0.28
Bunker Hill Village 2 NW 0.24 Hockley 7 S - Cypress Creek 0.23
Montgomery 0.20 Montgomery 2.6 NE 0.18
Dobbin 1 NE - Lake Creek 0.12 Cleveland - E FK San Jacinto 0.06
Barker - Barker Reservoir 0.05

Bryan/College Station Area...

College Station 10.4 ENE 0.20 Brenham 0.7 E 0.17
Madisonville 0.11 College Station 6.4 ENE 0.11
College Station 4.5 SW 0.08 Brenham 8.7 NW 0.08
Gause 2.5 W 0.06 Brenham 0.05
College Station 3.2 SE 0.04 Caldwell Municipal Airport 0.03
Bryan 3 NE- Coulter Field 0.02 College Station-Easterwood Apt 0.02
Brenham 8 E 0.02 Chappell Hill 1 NW 0.02
Chappell Hill 1.8 N 0.02 Hearne - Municipal Airport 0.01
Normangee 9 SW - Navasota Rvr 0.01 Somerville 2 S - Somerville Lk 0.01
College Station 5.7 S 0.01 College Station 0.3 ESE 0.01

Galveston and Coastal Areas...

Sargent 1 ENE 21.34 Galveston 8.3 NE 8.63
Alvin 6 SW - Chocolate Bayou 8.21 Brazoria NWR 7.52
Galveston 6.4 NE 7.33 Bay City - Colorado River 7.13
Midfield 6.50 La Marque 1.8 E 6.42
Galveston 5.6 NE 6.24 Lake Jackson 1.6 E 6.11
Santa Fe 0.7 S 6.00 Galveston - Scholes Airport 5.86
Angleton - Brazoria Co Arpt 5.86 Hitchcock 1.6 NNW 5.29
Matagorda 1 S 5.19 Texas City 3.8 E 4.58
La Marque 3.9 SE 4.53 West Columbia 1 ESE 4.25
Crystal Beach 3.7 ENE 4.21 High Island 8 NNW - Anahuac 3.91
Palacios 11.5 NNE 2.90 Damon 1 NNW 1.92
Palacios Mncpl Airport 0.89 Edna 3.8 NNW 0.29
El Campo 4.9 SSE 0.06 Port Lavaca - Calhoun Co Arpt 0.05

Remainder of Houston / Galveston HSA...

Dayton 1.1 SE 5.28 Dayton 0.2 E 4.50
Liberty - Trinity River 2.55 Mont Belvieu 1.6 NNW 2.42
Romayor - Trinity River 1.43 Cleveland 2 S 0.91
Riverside - Trinity River 0.72 Goodrich 5 NW Lake Livingston 0.46
Huntsville 11.5 WSW 0.43 East Bernard - San Bernard Rvr 0.42
Trinity 3.7 E 0.41 Moulton 6.9 SE 0.35
Wharton 1.4 ESE 0.35 Lane City - Colorado River 0.34
Wharton 3.1 NE 0.34 Livingston 8.4 W 0.33
Shiner 5.1 ESE 0.31 Point Blank 0.7 ESE 0.31
Livingston 10 W 0.30 Livingston 2 W-Long King Creek 0.29
Huntsville 1.3 SSE 0.29 Trinity 2.9 E 0.28
Kennard 7 N 0.25 Shiner 5.8 ENE 0.25
Onalaska 0.6 WSW 0.25 Oakhurst 3.6 SSE 0.25
Wharton 0.3 E 0.24 Huntsville 2.3 S 0.22
Brenham 0.21 Crockett 0.21
Wharton - Colorado River 0.21 Hallettsville 6.8 WNW 0.20
Ratcliff 0.19 Trinity 5.1 NW 0.19
Livingston 13.4 NW 0.17 Brenham 1.3 ESE 0.17
Hallettsville 17.1 SE 0.16 Huntsville 0.15
San Felipe 1 WNW 0.15 Yoakum 6.2 NNE 0.15
Glen Flora - Colorado River 0.14 Bellville 0.9 ENE 0.13
Huntsville - Municipal Airport 0.13 Hallettsville - Lavaca River 0.12
Bellville 6.5 NNE 0.12 Wallis 4.3 NW 0.11
Burton 6.9 SSW 0.11 Bellville 1 SW 0.10
Frelsburg - Cummins Creek 0.10 Bellville 0.4 NE 0.10
Willis 5 NW - Huntsville RAWS 0.09 Sealy 0.3 WNW 0.09
Hallettsville 8 N 0.09 Hempstead - Brazos River 0.08
Cat Spring 1.4 N 0.07 Bellville 4.3 NW 0.07
Huntsville 4.8 NNW 0.07 Weimar 7 S 0.07
Columbus - Colorado River 0.06 Dime Box - East Yegua Creek 0.06
Eagle Lake 7 NE 0.06 Attwater NWR near Lafitte 0.05
Hallettsville 1 SSE 0.05 Moulton 0.3 S 0.05
Sealy 10 SW - San Bernard Rvr 0.04 Dime Box - Middle Yegua Creek 0.04
Moulton 1 SSE 0.04 El Campo 2.7 NW 0.04
El Campo 2 NW 0.03 Brenham 8 SW 0.03
El Campo 1 NW 0.03 Industry 3 W 0.01
New Ulm 5.1 S 0.01

$$

Currently at this time, heavy rain is falling in East Texas around Beaumont area.

There is a line of thunderstorms forming north of Houston. Could this develop into a feeder band? Let’s look at the short term mesoscale forecast models. They are High-Resolution Rapid Refresh (HRRR), North American Mesoscale Forecast System (NAM), Regional Model (RGEM), and Weather Research and Forecast (WRF-NMM). They are at 0900Z or 4:00 AM CDT.

Most of the forecast models have rain east of Houston. The exception is WRF-NMM, which has thunderstorms over Houston at 4:00 AM. I would not be surprised if there is heavy rain tonight to tomorrow morning in the Houston area. One reason why I think Houston area could see rain is that Tropical Depression Imelda is moving northwest at 3 mph per Weather Prediction Center. A more westerly direction may suggest that rain could go westward towards Houston.

Here is what I think will happen.
-Heavy rain at night, especially near, east, and south of the center.
-Not ruling out Houston area getting heavy rain tonight.
-Rainfall amounts could range from 5 to 10 inches/12.7 to 25.4 centimeters of rain with isolated totals approaching and exceeding 15 inches/38.1 centimeters.

Imelda Strikes

NOAA/NESDIS/STAR GOES ABI BAND 14 OR_ABI-L1b-RadC-M6C14_G16_s20192610301156_e20192610303529_c20192610304061.nc

Tropical Imelda formed suddenly from Invest 98L. It was an area of low pressure over the Gulf Of Mexico. Imelda formed and made landfall on Freeport as a tropical storm earlier today. Now, it is over Houston area and is now a tropical depression per National Hurricane Center (NHC). The question is where Imelda goes. Here is a heat map from various forecast models. I used the latest forecast, which is 0000Z, to create the heat map. I got them from NCAR-Tropical Cyclone Guidance. It is a heat map using points within 300 mile/480 kilometers radius.

This is a low confidence forecast as it is circular in shape. Something I saw with Harvey. The forecast models are all over the place on where Imelda will go in the next 5 days. This shows that this is far from over. Since the winds have died down, heavy rain and flooding will be the main problem. Here is the most recent Doppler radar loop from NWS Houston.

Looks like Imelda is moving westward and slowing down. The heavy rain is linger over the Houston area. This is rather concerning. With these tropical systems, heavy rain can develop near the center of the low. The thunderstorms flare up at night due to the warm core and cooler surrounding temperature. Core rain occurred in Thrall (1921), Alice (1954), Beulah (1967), Camille (1969), Claudette (1979), Allison (2001), and Harvey (2017). Right now it looks quiet, but it can change suddenly.

Let’s look at the short term mesoscale forecast models. They are High-Resolution Rapid Refresh (HRRR), North American Mesoscale Forecast System (NAM), Regional Model (RGEM), and Weather Research and Forecast (WRF-ARW, and WRF-NMM). They are at 0900Z or 4:00 AM CDT.

The forecast models have thunderstorms firing up east of the center. HRRR has thunderstorms east of Houston. The NAM has thunderstorms over Western Harris County. The RGEM has thunderstorms along the coast. The WRF-NMM has thunderstorms over Houston. The WRF-ARW had not been updated at the time. The only consensus is that thunderstorms and heavy rain will form along and near the center of Imelda tonight. The question is where as forecast models are all over the place.

Here is what I think will happen.
-Heavy rain at night, especially near and east of the center.
-Not ruling out Houston area getting heavy rain tonight.
-Rainfall amounts could range from 5 to 10 inches/12.7 to 25.4 centimeters of rain with isolated totals approaching and exceeding 15 inches/38.1 centimeters.

This is looking to be a wet week regardless of what happens. I would not be surprised if some areas could see 20 to 30 inches/50.8 to 76.2 centimeters of rain once it is all over.