Not a trace of Don; What's next?
Don is dead
Tropical Storm Don, the fourth named storm of the 2011 season, made landfall near Baffin Bay, Texas yesterday evening around 10pm CDT in less-than-grand fashion. The storm was looking very weak for the 24 hours before landfall, but fizzled rapidly after landfall, and by early Saturday morning, there was barely a trace of the storm to show that it even existed in the first place.
NHC Hurricane Specialist Eric Blake probably said it best in this mornings 5am EDT discussion on the storm:
THE DON IS DEAD. THE CYCLONE LITERALLY EVAPORATED OVER TEXAS ABOUT
AS FAST AS I HAVE EVER SEEN WITHOUT MOUNTAINS INVOLVED. DON HAS NO
CONVECTION...MEAGER RAINFALL...AND ONLY A SLIGHT SIGNATURE IN
SURFACE OBSERVATIONS AND RADAR DATA. THEREFORE...THIS IS THE LAST
ADVISORY ON THIS SYSTEM.
Figure 1. Total precipitation accumulation for the storm, estimated by radar.
The heaviest rainfall was falling south of the storm's center yesterday, so it wasn't surprising that Brownsville saw the most rain, 0.63 inches. KBRO also recorded 18 mph wind gusts. But to the north of the center, where many of the media were located, not a drop of rain fell. Corpus Christi saw zero inches of rain, but did record gale-force wind gusts (39 mph). Harlingen, near Baffin Bay, and close to where the center made landfall, saw 0.20 inches of rain and 18 mph wind gusts. This storm did very, very little to relieve any drought conditions in Southern Texas. And so it continues.
What's next: Invest 91L continues to impress
Invest 91L, which is located near 12°N 48°W in the central Atlantic, continues to impress today, and has shown signs of more organization over the past 24 hours. 91L will probably develop into a tropical cyclone before it reaches the Lesser Antilles, so residents of these islands should remain watchful and prepared. Satellite loops show not only organized thunderstorm activity, but also the makings of a surface circulation. Something this wave has working against it right now is dry air—there's a large mass of Saharan air on the north and east sides of the system, which could at least prevent significant intensification. Also, University of Wisconsin CIMSS analysis shows some strong wind shear (30-40 knots) to the north of the wave. However, I don't expect this to prevent development of the wave. Wind shear out ahead of the system is relatively low (5-15 knots). Moisture is plenty high within the system, and sea surface temperatures are warm and toasty (28°C+) and will only get warmer as 91L moves west into the Caribbean.
Figure 2. Infrared satellite of invest 91L taken at 1:15pm EDT today.
Forecast for 91L
Most of the reliable forecast models (GFS, CMC, FIM, and the ECMWF) have come to agree that 91L will develop, however, they differ on how long-lived that will be. Some of the models are suggesting it will be a short-lived tropical cyclone, not making it out of the Caribbean alive, and some suggest that it will hold together and intensify as it moves north of the Caribbean islands. The forecast track for the system will most likely be to the northwest through the Caribbean, at which point it will take a northeast turn near the Bahamas, never reaching the U.S. coast. HWRF agrees with this track (and also brings the system to category 2 strength by August 3rd). However, there is still some uncertainty that the system could track west, south of the Caribbean islands, and potentially into the Gulf of Mexico. However, none of the models that suggest this solution actually show that the wave will be a tropical cyclone at that point.
The National Hurricane Center is giving this wave an 80% chance of developing into at least Tropical Depression Five over the next 48 hours. Chances are we will see Emily out of this system. A Hurricane Hunter mission is scheduled for tomorrow at 2pm EDT, but I wouldn't be totally surprised to see them call this system this evening, given the threat to the Lesser Antilles.
Watching a northwest Caribbean disturbance
A broad area of disturbed weather is producing some heavy thunderstorms in the northwest Caribbean, southeast of the Yucatan Peninsula. Little to no low-level circulation exists with this feature, and none of the models are picking up on it. The Hurricane Center has "blobbed" this item (as I like to say) with a "near 0%" chance of developing over the next 48 hours. This disturbance could cause major flooding in the region given the amount of thunderstorm activity, and predictability for systems like this (potential Bay of Cempeche tropical cyclones) is very low. Models have a short lead time on development, and they spin up very fast once they enter the Bay of Campeche given the favorable topography of the land surrounding it. The difference between this system, though, and one like Arlene, is that there is very, very little low level circulation already present. Pre-Arlene was a bit more organized before it crossed the Yucatan, and so it's hard to imagine that this disturbance will be able to hold together, should it get that far.
If 91L develops, I'll be back tomorrow with a post.
Angela
Reader Comments
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(bows) but of course my good sir!
And no where did they say that this is an English-only blog.
It's getting absorbed back into 91L. When it finally finishes it, this thing is gonna be huge.
+1
I got the klingon covered, haha.
i dont care if they want to do this when we dont have a storm too talk about but we do and when some one is trying too find out info about 91L and not sure how too read the commets they will go a way
Translate to English and I'll answer...please.
Yo bud.
NWS NATIONAL HURRICANE CENTER MIAMI FL
800 PM EDT SUN JUL 31 2011
FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...
AN ELONGATED AREA OF LOW PRESSURE EXTENDING FROM THE LESSER ANTILLES
EASTWARD SEVERAL HUNDRED MILES INTO THE TROPICAL ATLANTIC OCEAN IS
PRODUCING A LARGE BUT DISORGANIZED AREA OF SHOWERS AND
THUNDERSTORMS. CONDITIONS ARE EXPECTED TO REMAIN FAVORABLE FOR A
TROPICAL DEPRESSION OR TROPICAL STORM TO FORM...AND THIS SYSTEM HAS
A HIGH CHANCE...90 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING
THE NEXT 48 HOURS AS IT MOVES WEST-NORTHWESTWARD AT AROUND 15 MPH.
IF THE SYSTEM BECOMES A TROPICAL CYCLONE TONIGHT OR MONDAY...
TROPICAL STORM WATCHES OR WARNINGS WOULD BE ISSUED FOR PORTIONS OF
THE NORTHERN WINDWARD ISLANDS AND THE LEEWARD ISLANDS ON VERY SHORT
NOTICE...AND INTERESTS IN THESE AREAS SHOULD CLOSELY MONITOR THE
PROGRESS OF THIS SYSTEM. A HURRICANE HUNTER AIRCRAFT IS SCHEDULED
TO INVESTIGATE THIS SYSTEM MONDAY MORNING. REGARDLESS OF TROPICAL
CYCLONE FORMATION...THIS SYSTEM WILL BRING LOCALLY HEAVY RAINFALL
AND GUSTY WINDS TO PORTIONS OF THE LESSER ANTILLES TONIGHT AND
MONDAY.
ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.
$$
FORECASTER BRENNAN
And what if a Spanish speaker comes on here and wants to find out whats going on with a storm?
You have to yell louder to people speaking a foreign language. In theory it makes it easier for them to understand you. (this only works if they only know that other foreign language)
Yeah, we're down to 90%.
When using Dr. Masters' blog, please refrain from posting material not relevant to the discussion of tropical weather, or the topic of the blog entry itself. Please do not engage in personal attacks or bickering. Material not conforming to these standards should be flagged with the button and ignored.
Nice arc clouds heading east off the northern part of the blob. Another sign of the dry air lurking north of the blobs.
------------------------------------------------- -------------------------------
000
ABNT20 KNHC 312335
TWOAT
TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
800 PM EDT SUN JUL 31 2011
FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...
AN ELONGATED AREA OF LOW PRESSURE EXTENDING FROM THE LESSER ANTILLES
EASTWARD SEVERAL HUNDRED MILES INTO THE TROPICAL ATLANTIC OCEAN IS
PRODUCING A LARGE BUT DISORGANIZED AREA OF SHOWERS AND
THUNDERSTORMS. CONDITIONS ARE EXPECTED TO REMAIN FAVORABLE FOR A
TROPICAL DEPRESSION OR TROPICAL STORM TO FORM...AND THIS SYSTEM HAS
A HIGH CHANCE...90 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING
THE NEXT 48 HOURS AS IT MOVES WEST-NORTHWESTWARD AT AROUND 15 MPH.
IF THE SYSTEM BECOMES A TROPICAL CYCLONE TONIGHT OR MONDAY...
TROPICAL STORM WATCHES OR WARNINGS WOULD BE ISSUED FOR PORTIONS OF
THE NORTHERN WINDWARD ISLANDS AND THE LEEWARD ISLANDS ON VERY SHORT
NOTICE...AND INTERESTS IN THESE AREAS SHOULD CLOSELY MONITOR THE
PROGRESS OF THIS SYSTEM. A HURRICANE HUNTER AIRCRAFT IS SCHEDULED
TO INVESTIGATE THIS SYSTEM MONDAY MORNING. REGARDLESS OF TROPICAL
CYCLONE FORMATION...THIS SYSTEM WILL BRING LOCALLY HEAVY RAINFALL
AND GUSTY WINDS TO PORTIONS OF THE LESSER ANTILLES TONIGHT AND
MONDAY.
ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.
$$
FORECASTER BRENNAN
In which language you track 91L?
Down to 90%. Good news.
Taz you have it backwards. There is so much Spanish because 91L is tracking towards Spanish speaking countries. If there were no storms then there would be no reason to be on the blog so no Spanish.
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