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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351. Hurricanes101 04:25 PM GMT del 21 Giugno 2010    
Quoting louisianaboy444:


GOOD JOB! Do i make the winnings out to Record Season or do you go by another name my friend wink wink :)


ah ok, good one lol
Member Since: Marzo 10, 2010 Posts: 1 Comments: 6902
352. xcool 04:25 PM GMT del 21 Giugno 2010    
troll OMG HERE WE GO
Member Since: Settembre 26, 2009 Posts: 2 Comments: 15501
353. CybrTeddy 04:25 PM GMT del 21 Giugno 2010    
Quoting StSimonsIslandGAGuy:
The only consecutive Cat 5 storm (even though I've never believed it should count as a Cat 5 storm):



Even though Erin developed while Dean was active, it also dissipated while Dean was active. Felix was the next storm to form after Dean.. and they become consecutive Category 5s.
Member Since: Luglio 8, 2005 Posts: 253 Comments: 20201
354. Levi32 04:25 PM GMT del 21 Giugno 2010    
93L looks to have a very good chance of becoming the first storm of 2010.
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355. CaneWarning 04:25 PM GMT del 21 Giugno 2010    
Quoting extreme236:


They will probably say it's showing some signs of organization. Probably orange alert (30%...maybe 40%)


Agreed.
Member Since: Aprile 26, 2009 Posts: 3 Comments: 3667
356. greentortuloni 04:25 PM GMT del 21 Giugno 2010    
Quoting Hurricanes101: "dissipate the oil? by doing what bringing it inland? Yea ok cuz that is better *rolls eyes*"

I can't help but think BP has been praying for a hurricane to clear the oil. If the oil and water turn into foam and get sprayed around, ti's a mess but a thin coating over large places is impossible to clean up: i.e. no cost.
Member Since: Giugno 5, 2006 Posts: 0 Comments: 1187
357. Drakoen 04:25 PM GMT del 21 Giugno 2010    
Curacao is reporting NE and Bonaire is reporting winds out of the WNW (wind shift). A closed low is trying to form.
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358. MahFL 04:26 PM GMT del 21 Giugno 2010    
More banding on N side, none yet seen on S side.
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359. saintsfan06 04:26 PM GMT del 21 Giugno 2010    
This is all The Weather Channel has to say about 93L as of 11:53AM. This seems a little lame to me.

ATLANTIC

A tropical wave in the eastern Caribbean is producing disorganized showers and thunderstorms over the open waters as well as nearby land areas, including northern South America and the Lesser Antilles. This system should produce some locally heavy rainfall and gusty winds in the Virgin Islands, Puerto Rico, and the Lesser Antilles regardless of whether or not it develops into a tropical cyclone.
Member Since: Settembre 18, 2007 Posts: 0 Comments: 164
360. louisianaboy444 04:26 PM GMT del 21 Giugno 2010    
Quoting RecordSeason:
344:

I promise I'm not JFV.

I am a completely different jackass.


Uh oh lol
Member Since: Agosto 29, 2006 Posts: 17 Comments: 1218
362. tropicfreak 04:26 PM GMT del 21 Giugno 2010    
Quoting Drakoen:
Curacao is reporting NE and Bonaire is reporting winds out of the WNW (wind shift). A closed low is trying to form.


We will likely see TD 1 by tonight and TS alex by tomorrow, if not TD 1 by morning
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363. Drakoen 04:27 PM GMT del 21 Giugno 2010    
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364. reedzone 04:27 PM GMT del 21 Giugno 2010    
Whats different about 93L is that conditions are FAVORABLE!! I expect a TD in a few days, IF shear is low in the GOM, and this makes it in there, EXPECT rapid development into a Hurricane like the EURO is showing.
Member Since: Luglio 1, 2008 Posts: 13 Comments: 7247
365. GBguy88 04:27 PM GMT del 21 Giugno 2010    
Quoting Patrap:
#306

Opal..95.

She almost caught many on I-10 Evacuating..but thankfully weakened rapidly before landfall.


Opal was a dud...still packed a decent surge, but the winds really dropped off before landfall. One of only 3 eyes I've had the experience of witnessing.
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366. CaneWarning 04:28 PM GMT del 21 Giugno 2010    
We might get a TD quicker than we think.
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367. Patrap 04:28 PM GMT del 21 Giugno 2010    
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368. reedzone 04:29 PM GMT del 21 Giugno 2010    
BTW, also expect the NHC chances to go up, possibly to an orange code.
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369. hydrus 04:29 PM GMT del 21 Giugno 2010    
Quoting Patrap:
Donna near the Keys, Radar Image 1960

We can still see tree damage from Donna on U.S.41. Powerful storm.
Member Since: Settembre 27, 2007 Posts: 1 Comments: 14248
370. tropicfreak 04:29 PM GMT del 21 Giugno 2010    
Quoting StormW:
If you go here, zoom and animate, you can see it wrapping up.

NASA


Can't do it, have to have a special edition of java.
Member Since: Settembre 2, 2006 Posts: 110 Comments: 6566
371. 69Viking 04:29 PM GMT del 21 Giugno 2010    
Quoting Patrap:
Opal 95 shows how fast we can get a Bad one...close to Home.





She was my second Hurricane after moving to the Florida Panhandle in 1992. Erin came through in August as a Cat 1 but Opal in October amazed me with how fast it could develop and move towards the coast when a front picked her up and brought her to town!
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372. twhcracker 04:29 PM GMT del 21 Giugno 2010    
Quoting GBguy88:


Opal was a dud...still packed a decent surge, but the winds really dropped off before landfall. One of only 3 eyes I've had the experience of witnessing.


she was a pretty devastating dud! my gosh she wiped out the coast from pensacola to appalachicola. Entire streets and neighborhoods were washed away.
Member Since: Luglio 30, 2007 Posts: 6 Comments: 1448
373. tropicfreak 04:30 PM GMT del 21 Giugno 2010    
Quoting reedzone:
BTW, also expect the NHC chances to go up, possibly to an orange code.


Thats a no-brainer for sure.
Member Since: Settembre 2, 2006 Posts: 110 Comments: 6566
374. Hurricanes101 04:30 PM GMT del 21 Giugno 2010    
Quoting GBguy88:


Opal was a dud...still packed a decent surge, but the winds really dropped off before landfall. One of only 3 eyes I've had the experience of witnessing.


A dud? It killed 59 people, more than Andrew and Charley combined and caused 6 billion in damage.

Member Since: Marzo 10, 2010 Posts: 1 Comments: 6902
375. louisianaboy444 04:30 PM GMT del 21 Giugno 2010    
Quoting saintsfan06:
This is all The Weather Channel has to say about 93L as of 11:53AM. This seems a little lame to me.

ATLANTIC

A tropical wave in the eastern Caribbean is producing disorganized showers and thunderstorms over the open waters as well as nearby land areas, including northern South America and the Lesser Antilles. This system should produce some locally heavy rainfall and gusty winds in the Virgin Islands, Puerto Rico, and the Lesser Antilles regardless of whether or not it develops into a tropical cyclone.


Don't watch the TWC if any of us do its just for comic purposes
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376. scott39 04:30 PM GMT del 21 Giugno 2010    
Thanks Pat for the audio of Dr. Masters. The unknown of toxic dispersants really bothers me!
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377. leo305 04:30 PM GMT del 21 Giugno 2010    
Quoting Drakoen:
Curacao is reporting NE and Bonaire is reporting winds out of the WNW (wind shift). A closed low is trying to form.


pressure is falling
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378. kmanislander 04:30 PM GMT del 21 Giugno 2010    
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379. Floodman 04:30 PM GMT del 21 Giugno 2010    
Quoting tropicfreak:


Can't do it, have to have a special edition of java.


IE8 plus all the current updates and it works fine
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380. FSUstormnut 04:30 PM GMT del 21 Giugno 2010    
I have been following this website for over 6 years now and this is perhaps the first time I have seen Dr. Master stat; "major problem" for an invest!... That is pretty amazing... he didn't even use the word "potential." Scary stuff.
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381. winter123 04:31 PM GMT del 21 Giugno 2010    
Quoting Floodman:


Wow...so you don't see the slightest possibility of something interfering with this feature developing? How about track? I imagine you can tell us exactly where it's going? A CAT7 super-hypercane in Tampa at 144 hours?

No, CAT8 into New Orleans. Already I think I see a pinhole eye!
Member Since: Luglio 29, 2006 Posts: 28 Comments: 1700
382. KEEPEROFTHEGATE (Mod) 04:31 PM GMT del 21 Giugno 2010    
Quoting Levi32:
93L looks to have a very good chance of becoming the first storm of 2010.
and the first major to boot mark my words
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383. Levi32 04:31 PM GMT del 21 Giugno 2010    
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384. reedzone 04:31 PM GMT del 21 Giugno 2010    
I honestly don't understand why Dr. Masters is going really conservative with this one when wind shear ahead of this invest is 5-10 knots..
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386. twhcracker 04:32 PM GMT del 21 Giugno 2010    
opal did catch many on I-10. My niece spent opal on I-10 in the jam.
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387. louisianaboy444 04:32 PM GMT del 21 Giugno 2010    
Quoting winter123:

No, CAT8 into New Orleans. Already I think I see a pinhole eye!


The Red Spot on Jupiter is an Analog storm IMO
Member Since: Agosto 29, 2006 Posts: 17 Comments: 1218
389. CaneWarning 04:32 PM GMT del 21 Giugno 2010    
Quoting reedzone:
I honestly don't understand why Dr. Masters is going really conservative with this one when wind shear ahead of this invest is 5-10 knots..


He sees no reason to freak us all out yet.
Member Since: Aprile 26, 2009 Posts: 3 Comments: 3667
390. Patrap 04:33 PM GMT del 21 Giugno 2010    
Quoting scott39:
Thanks Pat for the audio of Dr. Masters. The unknown of toxic dispersants really bothers me!

Were entering a period of Unknowns big Time scott

Were all gonna have to be on our toes now as the world will be watching here.

We can roll Info or go berserk.

Im gonna choose to roll Info.

Member Since: Luglio 3, 2005 Posts: 370 Comments: 111244
391. Hurricanes101 04:33 PM GMT del 21 Giugno 2010    
Quoting louisianaboy444:


The Red Spot on Jupiter is an Analog storm IMO


lmao
Member Since: Marzo 10, 2010 Posts: 1 Comments: 6902
392. KEEPEROFTHEGATE (Mod) 04:33 PM GMT del 21 Giugno 2010    
Quoting kmanislander:
Bonaire now reporting WNW winds and falling pressure.

Surface low organizing
yeppers time is real short for first storm to form
Member Since: Luglio 15, 2006 Posts: 143 Comments: 40413
393. Floodman 04:33 PM GMT del 21 Giugno 2010    
Quoting winter123:

No, CAT8 into New Orleans. Already I think I see a pinhole eye!


LOL...if you're going to be a bear, be a grizzly!
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394. tropicfreak 04:33 PM GMT del 21 Giugno 2010    
This thing is rapidly organizing, surface low is currently developing as we speak.
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395. scott39 04:33 PM GMT del 21 Giugno 2010    
Are there oil plumes less than 500ft?
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396. BenBIogger 04:33 PM GMT del 21 Giugno 2010    
Quoting Drakoen:
Curacao is reporting NE and Bonaire is reporting winds out of the WNW (wind shift). A closed low is trying to form.


93L Seem more like a convergence line to me.
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397. AllStar17 04:33 PM GMT del 21 Giugno 2010    
Here we go! We better stay on our toes!
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398. Levi32 04:33 PM GMT del 21 Giugno 2010    
Quoting Drakoen:
Curacao is reporting NE and Bonaire is reporting winds out of the WNW (wind shift). A closed low is trying to form.
Quoting kmanislander:
Bonaire now reporting WNW winds and falling pressure.

Surface low organizing


Keep in mind that the two other stations on the island are reporting SSE winds. If there is any westerly wind trying to start it is not very defined yet. We'll have to keep watching it.

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399. CaneWarning 04:34 PM GMT del 21 Giugno 2010    
Quoting twhcracker:
opal did catch many on I-10. My niece spent opal on I-10 in the jam.


A situation like that could lead to a huge loss of life. I remember as Katrina was hitting there were rumors that there were hundreds of cars stuck on bridges...thank goodness those rumors were not true since those bridges didn't survive the storm.
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400. reedzone 04:34 PM GMT del 21 Giugno 2010    
Quoting CaneWarning:


He sees no reason to freak us all out yet.


Tru, I guess it's a good call then. All I'm saying, and I said this last nght, with those warm above average sea temps in the GOM, EXPECT a Hurricane to form IF shear values are low.
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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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