Dr. Jeff Masters' WunderBlog

New Caribbean disturbance 93L a major concern; flooding in Asia kills over 200
Posted by: Dr. Jeff Masters, 02:50 PM GMT del 21 Giugno 2010 +6
A concentrated region of intense thunderstorms associated with a tropical wave has developed in the central Caribbean, a few hundred miles south of Puerto Rico. This disturbance was designated Invest 93L by NHC this morning, and has the best chance to become Tropical Storm Alex of any system we've seen so far this year. The disturbance is located near Buoy 42059, and this buoy has been reporting winds of 5 - 15 knots this morning. So far, pressures are not falling. Water vapor satellite loops show that 93L is embedded in a large region of moist air. Some dry continental air from North America is over the western Caribbean, but this dry air is too far away to interfere with development today and Tuesday. Wind shear is a low 5 - 10 knots. The high wind shear associated with the strong winds of the subtropical jet stream are over the northern Caribbean, too far north to interfere with development. Sea Surface Temperatures are plenty warm, a record 29 - 30°C. The Madden-Julian oscillation currently favors upward motion over the Caribbean, which will act to increase the chances of tropical storm formation this week. The Madden-Julian oscillation is a pattern of enhanced rainfall that travels along the Equator from west to east. The pattern has a wet phase with large-scale rising air and enhanced thunderstorm activity, followed by a dry phase with large-scale sinking air and suppressed thunderstorm activity. Each cycle lasts approximately 30 - 60 days. When the Madden-Julian oscillation is in its wet phase over a hurricane-prone region, the chances for tropical storm activity are greatly increased. The only negative for 93L would seem to be the lack of spin; the University of Wisconsin 850 mb relative vorticity analysis is showing only meager amounts of spin at 850 mb (roughly 5,000 feet in altitude.)


Figure 1. Morning visible satellite image of the central Caribbean disturbance 93L.

Forecast for 93L
NHC is giving 93L a 20% chance of developing into a tropical depression by Wednesday morning, which is a reasonable forecast. With wind shear expected to drop to low values less than 10 knots over the central and western Caribbean this week (Figure 2), I don't see any major impediments to the storm becoming a tropical depression by Friday. The ECMWF model is the most aggressive in developing this system, taking it into the Gulf of Mexico as a hurricane next week. The NOGAPS model keeps the storm weak and farther south, predicting that 93L will bring heavy rains to northern Honduras as a tropical disturbance or tropical depression on Friday and Saturday. The GFS model does not develop 93L. Expect 93L to bring flooding rains of 3 - 6 inches to Jamaica, eastern Cuba, and extreme southwestern Haiti on Wednesday. These rains will spread to the Cayman Islands and central Cuba by Thursday.


Figure 2. Predicted wind shear for Friday, June 25, as forecast by this morning's 2am EDT run of the GFS model. Shear is given in meters per second; multiply by about two to convert to knots. Low wind shear values less than 6 m/s (12 knots) are predicted for much of the Western Caribbean this week.

Elsewhere in the tropics
The tropical wave (92L) that brought heavy rains of 2 - 5 inches to Puerto Rico on Saturday has weakened and is no longer a threat to bring flooding rains to the Caribbean.

Floods in China and Burma kill over 200
The deadliest and most destructive weather-related disaster on the planet so far this year is occurring in southern China and northern Burma, where a week of heavy rains has caused flooding that has claimed over 200 lives. The death toll stands at 175 in China and 63 in Burma, with more than 100 people still missing in China. Damage so far in China has been estimated at $4.3 billion.


Figure 3. Tree branches hung on a bridge at Taining County, southeast China's Fujian Province, June 19, 2010. Taining recorded 225 mm (9 inches) of rain in six hours on Friday. Image credit: Xinhua/Jiang Kehong.

Montana tornado rips roof off entertainment complex
A EF-2 tornado with winds of at least 100 mph ripped the roof of an entertainment complex in Billings, Montana on Sunday, causing up to $15 million in damage. No injuries were reported. It was the strongest tornado to hit the Billings area since 1958.


Figure 4. Video of the Billings tornado shows an impressive debris cloud (and a few expletives not deleted!) The clear slot on the right of the tornado is likely associated with the parent thunderstorm's rear flank downdraft.

Wind and ocean current forecast for the BP oil disaster
Southeast to east winds less than 10 knots will blow in the northern Gulf of Mexico today through Friday, according to the latest marine forecast from NOAA. The resulting weak ocean currents should cause little motion of the oil slick, according to the latest trajectory forecasts from NOAA and the State of Louisiana. The long range outlook is uncertain, as the tropical wave over the central Caribbean could enter the Gulf of Mexico early next week and develop into a tropical storm.

Resources for the BP oil disaster
My post, What a hurricane would do the Deepwater Horizon oil spill
My post on the Southwest Florida "Forbidden Zone" where surface oil will rarely go
My post on what oil might do to a hurricane
NOAA's interactive mapping tool allows one to overlay wind and ocean current forecasts, oil locations, etc.
Gulf Oil Blog from the UGA Department of Marine Sciences
Oil Spill Academic Task Force
University of South Florida Ocean Circulation Group oil spill forecasts
ROFFS Deepwater Horizon page
Synthetic Aperture Radar (SAR) imagery from the University of Miami

Jeff Masters
Billings, MT tornado (StormTeam)
Photo taken from approx. 5-6 miles east. Video here: http://www.youtube.com/watch?v=8429C0-LSlo
Billings, MT tornado
Categories: Flood Hurricane
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1101. StadiumEffect 07:18 PM GMT del 21 Giugno 2010    
Quoting Drakoen:


Safe to say that it's a wet one!
1102. bjdsrq 07:18 PM GMT del 21 Giugno 2010    
Quoting Patrap:
..Hi, Dozo..

"Oil-Zilla"



Category 10W-30 by Sunday.
Member Since: Luglio 26, 2003 Posts: 3 Comments: 428
1103. xcool 07:19 PM GMT del 21 Giugno 2010    
TAKE ALL MODELS RIGTH NOW throw it out the DOOR
Member Since: Settembre 26, 2009 Posts: 2 Comments: 15503
1104. MississippiWx 07:19 PM GMT del 21 Giugno 2010    
Quoting Levi32:


These swings should be fully expected. We can't expect the ECMWF to be consistent on anything other than development at this point. The ECMWF can't even initialize the center on every run without a center to initialize. It has the vort max doing different things on every run because the system hasn't figured itself out yet. It's a complex situation with 3 different systems in the mix.


I noticed you said earlier that the winds under 93L are still easterly, but cloud-wise, it looks like 93L is slowly but surely bending the flow around it. To the east, clouds are moving to the north and on the west side, the clouds are starting to take on a southerly hint.
Member Since: Luglio 15, 2006 Posts: 14 Comments: 8651
1105. Drakoen 07:19 PM GMT del 21 Giugno 2010    
Quoting Levi32:


Partly associated with an old low that got stuck over Venezuela and is now drifting north towards 93L's area. That's the other thing that's making the situation more complicated.


850MB vort is south and east of those islands
Member Since: Ottobre 28, 2006 Posts: 57 Comments: 29010
1106. PalmBeachWeatherBoy 07:20 PM GMT del 21 Giugno 2010    
I think this might be a panhandle threat, DONT HIT THE PANIC BUTTON, im a nobody, just a wild GUESS
Member Since: Agosto 30, 2006 Posts: 1 Comments: 433
1107. Tazmanian 07:20 PM GMT del 21 Giugno 2010    
TD by tuesday AM
Member Since: Maggio 21, 2006 Posts: 5088 Comments: 111361
1109. FLWeatherFreak91 07:20 PM GMT del 21 Giugno 2010    
Quoting StormW:
Not good...hot towers

Storm, wouldn't you say there is a difference between "hot towers" and overshooting tops? Because I would tend to reserve the term "hot tower" to what occurs inside the eyewall of a strong hurricane due to the friction between two different area of the eyewall
Member Since: Dicembre 1, 2006 Posts: 2 Comments: 3462
1110. Tazmanian 07:20 PM GMT del 21 Giugno 2010    
Quoting Stormchaser2007:


Is that a joke?



nop he is right hot towers
Member Since: Maggio 21, 2006 Posts: 5088 Comments: 111361
1111. Stormchaser2007 07:20 PM GMT del 21 Giugno 2010    
Western side is void of convection.

Member Since: Giugno 9, 2007 Posts: 4 Comments: 15249
1112. Levi32 07:20 PM GMT del 21 Giugno 2010    
Look at how light the winds are in the western Caribbean. There is major potential for piling up of air here as the fast-moving trades slam the brakes. This increases surface convergence and forces the air to rise. The monsoon trough is also farther north than normal and is over the Caribbean rather than over Panama. This is another feature getting involved in this situation. It's complex, and is a big reason why the ECMWF is jumpy.

Member Since: novembre 24, 2005 Posts: 587 Comments: 25462
1113. Stormchaser2007 07:21 PM GMT del 21 Giugno 2010    
Quoting FLWeatherFreak91:
Storm, wouldn't you say there is a difference between "hot towers" and overshooting tops? Because I would tend to reserve the term "hot tower" to what occurs inside the eyewall of a strong hurricane due to the friction between two different area of the eyewall


Exactly.
Member Since: Giugno 9, 2007 Posts: 4 Comments: 15249
1114. Tazmanian 07:21 PM GMT del 21 Giugno 2010    
Quoting Stormchaser2007:
Western side is void of convection.





that looks hrs old
Member Since: Maggio 21, 2006 Posts: 5088 Comments: 111361
1115. 7544 07:21 PM GMT del 21 Giugno 2010    
93l could be a fla strom imo the models will go more east looks like 93l is starting to inch n ne at this hour
Member Since: Maggio 6, 2007 Posts: 0 Comments: 5925
1117. bjdsrq 07:22 PM GMT del 21 Giugno 2010    
Quoting Tazmanian:



nop he is right hot towers


Had one of those this morning... too many tacos last night.
Member Since: Luglio 26, 2003 Posts: 3 Comments: 428
1119. rmbjoe1954 07:22 PM GMT del 21 Giugno 2010    
Quoting smarterthanyou:
a nice summer blow
wiping Florida away
could be a blessing


Why would you even say that? Anyway, until there is a COC, I am not relying much on what the models' solutions are to-date.
Member Since: Giugno 16, 2005 Posts: 0 Comments: 733
1120. Levi32 07:22 PM GMT del 21 Giugno 2010    
Quoting MississippiWx:


I noticed you said earlier that the winds under 93L are still easterly, but cloud-wise, it looks like 93L is slowly but surely bending the flow around it. To the east, clouds are moving to the north and on the west side, the clouds are starting to take on a southerly hint.


They are, but it usually starts at the mid-levels and that's what we're seeing. Surface winds may start to turn later, but I expect gradual, not rapid, organization of the system over the next couple days.
Member Since: novembre 24, 2005 Posts: 587 Comments: 25462
1121. CybrTeddy 07:22 PM GMT del 21 Giugno 2010    
Quoting Stormchaser2007:
Western side is void of convection.



Still becoming organized, note the spiral banding starting to become evident. Loss in convection is expected as the day goes on.. no dry air or shear to impede its development.

ECMWF may have backed off some, but it still shows a strong TS towards Texas. NOGAPS is still with us.
Member Since: Luglio 8, 2005 Posts: 253 Comments: 20280
1122. FLWeatherFreak91 07:22 PM GMT del 21 Giugno 2010    
Quoting Stormchaser2007:
Western side is void of convection.

It's because all of the convection at this time is only being supported by convergence. If the storm wants to develop, it better form a surface low before losing the convergence.
Member Since: Dicembre 1, 2006 Posts: 2 Comments: 3462
1123. FLWeatherFreak91 07:23 PM GMT del 21 Giugno 2010    
Quoting StSimonsIslandGAGuy:
Actually, the more I think about it, planting kudzu all over Haiti might be a good idea. Plant trees and they'll just be chopped down for firewood.
Haha. Well, I hope that doesn't happen because the beautiful half of the island (Dominican Republic) doesn't need any kudzu all over its palm trees ;)
Member Since: Dicembre 1, 2006 Posts: 2 Comments: 3462
1124. IKE 07:24 PM GMT del 21 Giugno 2010    
Quoting xcool:
TAKE ALL MODELS RIGTH NOW throw it out the DOOR


Why? Short-term none of the 4 develop this....GFS,CMC,NOGAPS and ECMWF don't for at least 3-4 days.

Quoting Tazmanian:




that looks hrs old


It's current.
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37047
1125. blueyedhrlyridr 07:24 PM GMT del 21 Giugno 2010    
Looks like it has about 25knt shear in the Northwest Carribean. This shear should relax some before 93 gets there. that is where I feel we will have T.S. status. Depending on where it crosses the yukatan will depend on how fast it gets its act together
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1126. Tazmanian 07:24 PM GMT del 21 Giugno 2010    
Quoting IKE:


Why? Short-term none of the 4 develop this....GFS,CMC,NOGAPS and ECMWF don't for at least 3-4 days.



It's current.



well it may be but too me it looks hrs old
Member Since: Maggio 21, 2006 Posts: 5088 Comments: 111361
1127. Stormchaser2007 07:24 PM GMT del 21 Giugno 2010    
Quoting FLWeatherFreak91:
It's because all of the convection at this time is only being supported by convergence. If the storm wants to develop, it better form a surface low before losing the convergence.


A surface low should form within the next 12-36 hours.
Member Since: Giugno 9, 2007 Posts: 4 Comments: 15249
1128. Clearwater1 07:25 PM GMT del 21 Giugno 2010    
Quoting StormW:
Not good...hot towers



Hot towers mean no so strong? Right, so you mean it's a good thing. Or am I once again totally off base.
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1130. sflawavedude 07:25 PM GMT del 21 Giugno 2010    
Is south florida going to be hit by any storms by tihs time next week? :)
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1132. StormGoddess 07:25 PM GMT del 21 Giugno 2010    

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1133. mcluvincane 07:26 PM GMT del 21 Giugno 2010    
We go through this every year guys. Models were weak worth Katrina at first then then u all know what happened. Models r useless as of now
Member Since: Giugno 2, 2010 Posts: 0 Comments: 1315
1136. FloridaRick 07:27 PM GMT del 21 Giugno 2010    
Quoting TexasGulf:


One of the most handy things is a small propane camping stove. You can either buy new or get an old used one on Craigslist. That's perfect for cooking meals for a small family.

If you've got a generator, remember to get a small window air conditioner. It can be used and doesn't have to look good, just be sure it works. If you lose electricity for several days, you can pick one room in your house that you can isolate for air conditioning.

If you live in a neighborhood and have your own yard... Tiki torches and fuel is a great thing to have. Neighborhoods can get really dark at night with no electricity. After Rita, I had 4 tiki's in the yard at night. A tiki torch in front yard and one in back provides some light, lets people know you're home and keeps the looters away. They can't see if you're sitting in the window watching or not, or if you're armed or not. They won't want to find out.

Lastly... take pictures of your home before the storm comes. Digital pictures will have the date & time on them. Take pictures of the exterior on all 4 sides, then take pictures of each room in the house. It doesn't take as long as you'd think. That will help enoromously when dealing with some insurance adjusters.

After the storm, it is typical not to be able to call out using your cell phone. Sometimes they shut down non-emergency calls. Remember... even if you can't call out, you can often send text messages to let people know you're OK.

If you choose to evacuate, bring a road map of your county that shows all the side streets. In case you need to get back in, national guard normally only blocks off the main roads and highways. You can sneak in past them, even if turned away at first, by taking the small residential side streets. Once you're in the county, they aren't authorized to kick you back out... even if they saw you sneak by on the side streets. The road map may also save you 1-2 hours during evacuation if you take roads other than the highways for as long as possible.


I would also add getting an old style phone that plugs into the wall. After Charlie in Punta Gorda this was the only phone in the house that worked. After 3 days of silence I heard the phone ringing in my daughters bed room. All other rooms had wireless phones and ran on electricity. You can get one of these phones for between 5 and 10 bucks.
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1137. Tazmanian 07:27 PM GMT del 21 Giugno 2010    
Quoting superweatherman:



AND HERE WE GO!




in joy the 24hr banned


During active periods of hurricane season, these rules will be strictly enforced. Violations will be met with a minimum 24 hour ban



see you in 24hrs






Member Since: Maggio 21, 2006 Posts: 5088 Comments: 111361
1138. gingerbabe 07:27 PM GMT del 21 Giugno 2010    
Quoting PalmBeachWeatherBoy:
I think this might be a panhandle threat, DONT HIT THE PANIC BUTTON, im a nobody, just a wild GUESS

the panhandle likes storms whose name starts with a vowel...agnes 1972...erin 1995...ivan 2004...opal 1995...just saying
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1139. IKE 07:27 PM GMT del 21 Giugno 2010    
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1140. FLWeatherFreak91 07:27 PM GMT del 21 Giugno 2010    
Quoting blueyedhrlyridr:
Looks like it has about 25knt shear in the Northwest Carribean. This shear should relax some before 93 gets there. that is where I feel we will have T.S. status. Depending on where it crosses the yukatan will depend on how fast it gets its act together
Really? on the 1500 utc shear map it looks like 80% of the storm is in an area of <10 kt shear.
Member Since: Dicembre 1, 2006 Posts: 2 Comments: 3462
1141. Tazmanian 07:27 PM GMT del 21 Giugno 2010    
Quoting StormGoddess:
Looks like this is the deal at the moment, imo.
Photobucket




give 92L a rest its gone and that no back up that is 93L
Member Since: Maggio 21, 2006 Posts: 5088 Comments: 111361
1143. kuppenskup 07:28 PM GMT del 21 Giugno 2010    
Quoting 7544:
93l could be a fla strom imo he models will go more east lloks like 93l is starting to inch n ne at this hour


Maybe the Fla Keys but no further North than that.
Member Since: Agosto 26, 2009 Posts: 0 Comments: 404
1144. MississippiWx 07:28 PM GMT del 21 Giugno 2010    
Quoting Levi32:


They are, but it usually starts at the mid-levels and that's what we're seeing. Surface winds may start to turn later, but I expect gradual, not rapid, organization of the system over the next couple days.


I hate these systems that take 2-3 days to organize just into a TD! They wear and tear on my brain. LOL.

Despite its improvement in the cloud pattern, it still doesn't look like it's in a big hurry to organize from top to bottom.
Member Since: Luglio 15, 2006 Posts: 14 Comments: 8651
1145. Tazmanian 07:28 PM GMT del 21 Giugno 2010    
Quoting IKE:




lol the wave be hide 93L has red in it
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1146. CoopNTexas 07:28 PM GMT del 21 Giugno 2010    
TOTALLY different setup than Katrina. Models are not useless now. GEEZ
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1148. gordydunnot 07:28 PM GMT del 21 Giugno 2010    
I think what ever was left of 92l has been messing with the west side of 93l that is why I think wait until tonight.
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1149. weathersp 07:29 PM GMT del 21 Giugno 2010    
I created this myself, learning is fun, when used with weather..

12z RAOB from Curacao...

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1150. Ossqss 07:29 PM GMT del 21 Giugno 2010    
I did not know if it had been brought up, but JB upped his forecast today. Urrgh!

http://www.accuweather.com/blogs/news/story/33013/bastardi_ups_hurricane_season.asp
Member Since: Giugno 12, 2005 Posts: 6 Comments: 8154

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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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