Dr. Jeff Masters' WunderBlog

New Caribbean disturbance 93L a major concern; flooding in Asia kills over 200
Posted by: Dr. Jeff Masters, 2:50 PM GMT on June 21, 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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601. winter123 5:23 PM GMT on June 21, 2010    
Quoting lickitysplit:
Pretty disturbing video from the GOM


Yes. I hope BP goes out of business for this. With record profits last year it appears unlikely though.
Member Since: July 29, 2006 Posts: 28 Comments: 1700
602. weathersp 5:23 PM GMT on June 21, 2010    
Quoting StormW:


Something for snake bites.


Very irritated gator's being pushed out of their swampy home...
Member Since: January 14, 2007 Posts: 17 Comments: 4112
603. CaneAddict 5:24 PM GMT on June 21, 2010    
Quoting TampaSpin:
Outside of the storm that started with an "A" that we are all familiar with....was anyother storm that was the first named storm a Major Hurricane.......i don't know of any off the top of my head without doing research?


I'm not sure but with 93L, I would expect the unexpected...The potential is there for this to become a major hurricane once it gets into the NW Caribbean.
Member Since: October 5, 2007 Posts: 3 Comments: 2151
604. Drakoen 5:24 PM GMT on June 21, 2010    
Quoting Levi32:


Notice how much weaker the trough is on the GFS.

Still 10 days out the trough could be flatter and the ridge could be stronger....it's not wise to make track forecasts yet. I'm just voicing the other side right now. West gulf should be watching this closely as well. I want to see what the 12z Euro shows.


It is not that much weaker and the trough is in place which means erosion will occur. The GGEM shows the same thing as well.
Member Since: October 28, 2006 Posts: 57 Comments: 29010
605. StormGoddess 5:25 PM GMT on June 21, 2010    
Quoting sebastianflorida:
My Forecast:
1)There are 10,000 blog entries prior to 93L becoming a named storm.
2)1200 bloggers will be poofed prior to any landfall.
3)1200 posts will state a Cat 5 is comming to S. Florida.
4) Some People will start boarding up within 3 days.
5) 600 posts will call this a fish storm, even though unlikely.
6) Someone will claim 100 degree waters in the Gulf.
7) 500 posts will have graphics of prior storms, 10 will claim Andrew is comming.
8) Several bloggers will tell you they know it is comming to them because the racoons are behaving oddly.
9) Rapidly intensifying will be stated 300 times.
10) I have a cruise on the 24th, should I go.
11) I'm in Iceland, any chance the outerbands affect me.
12) This thing is moving Southwesr over the last 10 minutes, I know it, will be stated a few times.
Just my predictions.
5)

ROFLOL. That's hilarious. Especially about the raccoons. :)
Member Since: June 10, 2010 Posts: 6 Comments: 570
606. TampaSpin 5:25 PM GMT on June 21, 2010    
Quoting leelee75k:
you guys are awesome, thanks for thinking of things I didn't think of. clothespins and clothesline definitely going on my list as well as the rest of the suggestions. Unfortunately we don't have a generator and I don't think one is in our budget for this year.

tampaspin, how do you store extra propane tanks? I thought it was unsafe to store them indoors and worry about leaving them outdoors during the storm.

I'm prepared with all the basics, pretty much have everything that listed on your normal hurricane supply list, I was just looking for things that we forget or overlook.


Garage keep.......everything comes inside.
Member Since: September 2, 2007 Posts: 175 Comments: 19747
607. Levi32 5:26 PM GMT on June 21, 2010    
First we have to get 93L to even develop at all before talking specifics about track and intensity. We still have 2 models to bring into the fold that aren't showing any development. I believe this will develop but without a defined center all specific track forecasts are worthless. All we have is a general idea that a weakness in the ridge will likely curve this northwest into the gulf, but where it goes in the gulf is up in the air.
Member Since: November 24, 2005 Posts: 586 Comments: 25459
609. Drakoen 5:26 PM GMT on June 21, 2010    
Big ol' trough on the GFS 12z

Member Since: October 28, 2006 Posts: 57 Comments: 29010
610. Levi32 5:26 PM GMT on June 21, 2010    
Quoting Drakoen:


It is not that much weaker and the trough is in place which means erosion will occur. The GGEM shows the same thing as well.


Erosion yes or this would be going into the Yucatan....how much erosion though remains to be seen. We cannot make a call on that yet. We simply can't.
Member Since: November 24, 2005 Posts: 586 Comments: 25459
611. TampaSpin 5:27 PM GMT on June 21, 2010    
Quoting StormW:


Something for snake bites.


Snakes won't bite OILY GREASY legs will they...JUST SAYIN
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613. hydrus 5:27 PM GMT on June 21, 2010    
Quoting sporteguy03:

Audry?
Alma? 1966.
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614. ecflweatherfan 5:28 PM GMT on June 21, 2010    
If you live anywhere along the Caribbean Sea, to the Gulf of Mexico and along the Atlantic Coast from Florida to the Canadian Maritimes, including Bermuda, the Bahamas and the Azores... you need to remain alert for this potentially dangerous storm currently named 93L... LOL!!!!
Member Since: March 19, 2010 Posts: 0 Comments: 947
616. Levi32 5:28 PM GMT on June 21, 2010    
12z CMC is a mess....takes 93L as a weak system into the Yucatan and tries to develop the wave behind it and curve it up towards Florida. Bringing the latter feature northwest while punching 93L into the Yucatan makes no sense.
Member Since: November 24, 2005 Posts: 586 Comments: 25459
617. IKE 5:29 PM GMT on June 21, 2010    
Quoting Levi32:
12z CMC is a mess....takes 93L as a weak system into the Yucatan and tries to develop the wave behind it. Bringing the latter feature northwest while punching 93L into the Yucatan makes no sense.


I was just fixing to post that.

Nothing major on that run.
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619. hydrus 5:29 PM GMT on June 21, 2010    
Link. Hurricane Alma.
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620. sporteguy03 5:29 PM GMT on June 21, 2010    
store important documents in the dishwasher, did it in '04 but remember to take them out before you do the dishes:)
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621. leelee75k 5:30 PM GMT on June 21, 2010    
tampa, but what if you don't have a garage? would you then bring them inside the house?
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622. unf97 5:30 PM GMT on June 21, 2010    
Good afternoon everyone!

Looks like 93L will keep this blog perculating for the days to come.
Member Since: September 25, 2007 Posts: 0 Comments: 1193
623. Hurricane1956 5:30 PM GMT on June 21, 2010    
Hello everybody!!!!!! we are here in South Florida any early concerns of what develops from 93L,coming this way?,the CMC model have the system making a sharp turn to the right crossing Cuba and coming to South Florida,any thoughts??,thanks!!
Member Since: August 28, 2006 Posts: 0 Comments: 410
625. twhcracker 5:30 PM GMT on June 21, 2010    
Quoting leelee75k:
a random question directed to those who have experienced hurricanes and lengthy power outages.

Besides the typical hurricane supplies we are all familiar with, what item or items do you consider to be invaluable either during or after a storm that is not commonly thought of?

thanks


water water watter. cant get enough of it. not just potable water but water for flushing the toilet and watering animals. a digital converter box if your tv sets are older models for when cable and satellite goes out.
Member Since: July 30, 2007 Posts: 6 Comments: 1448
628. TampaSpin 5:31 PM GMT on June 21, 2010    
Quoting leelee75k:
tampa, but what if you don't have a garage? would you then bring them inside the house?


Yes you would have to but, be careful....and never light it inside the house....which you know!
Member Since: September 2, 2007 Posts: 175 Comments: 19747
629. tornadodude 5:31 PM GMT on June 21, 2010    


MESOSCALE DISCUSSION 1054
NWS STORM PREDICTION CENTER NORMAN OK
1228 PM CDT MON JUN 21 2010

AREAS AFFECTED...PARTS OF NRN AND CENTRAL MO INTO CENTRAL IL

CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY

VALID 211728Z - 211830Z

WATCH WILL BE NEEDED EARLY THIS AFTERNOON ACROSS PARTS OF NRN AND
CENTRAL MO INTO MUCH OF CENTRAL IL.

EARLY AFTERNOON SURFACE ANALYSIS SHOWED A WARM FRONT EXTENDING ESEWD
FROM NERN IA THROUGH CENTRAL IL/IND INTO SRN OH. REGIONAL
RADARS/LIGHTNING DATA INDICATED AN AREA OF TSTMS TRACKING ENEWD
ACROSS SERN IA ALONG THE LEADING EDGE OF THE REMNANT IA MCS AND
ASCENT WITH ATTENDANT MCV/SHORTWAVE TROUGH. ADDITIONAL STORMS WERE
DEVELOPING ACROSS WEST CENTRAL IL SWWD INTO CENTRAL MO WHERE STRONG
SURFACE HEATING IS WEAKENING SBCINH SUFFICIENTLY FOR SURFACE BASED
STORMS. ALTHOUGH STORMS IN WEST CENTRAL IL MAY STILL BE SLIGHTLY
ELEVATED TO THE NNE OF AN OUTFLOW BOUNDARY... WHICH EXTENDED FROM
SRN IL NWWD TO NERN MO...FORECAST SOUNDINGS SUGGEST THIS ACTIVITY
WILL BECOME SURFACE BASED AS TEMPERATURES CONTINUE TO RISE THROUGH
THE UPPER 80S AND LOWER 90S. STEEP MIDLEVEL LAPSE RATES /7-7.5 C PER
KM/ WILL FURTHER CONTRIBUTE TO MODERATE TO VERY STRONG INSTABILITY
THIS AFTERNOON WITH MLCAPE VALUES ALREADY RANGING FROM 1500-3000
J/KG FROM MO INTO SERN IA AND SRN/CENTRAL IL. OBJECTIVE ANALYSES
INDICATED EFFECTIVE BULK SHEAR INCREASING INTO THE DISCUSSION AREA
WITH FURTHER INCREASE EXPECTED THIS AFTERNOON.

..PETERS.. 06/21/2010


ATTN...WFO...ILX...LSX...DVN...EAX...

LAT...LON 39239450 39979322 40789185 40929050 40808979 40088926
38938969 38719117 38769382 39239450
Member Since: June 28, 2006 Posts: 22 Comments: 7816
632. TampaTom 5:32 PM GMT on June 21, 2010    
Quoting hydrus:
Alma? 1966.


Allen - 1980..

Linkerooo....
Member Since: June 20, 2005 Posts: 22 Comments: 1049
633. thegoldenstrand 5:32 PM GMT on June 21, 2010    
Quoting winter123:


Yes. I hope BP goes out of business for this. With record profits last year it appears unlikely though.


and to think Obama had Ken Salazar go to bat for BP so it could drill after Washington DC court ruled in April of 2009 that BP and others could not drill due to environmental safety concerns.

After our inept Government helps destroy the Gulf, Obama and the gang are pushing Nuclear, which will lead to something possibly as bad inland within a couple years if Court decisions and laws are not respected.
Member Since: August 16, 2008 Posts: 0 Comments: 102
634. GoodOleBudSir 5:33 PM GMT on June 21, 2010    
Quoting leelee75k:
a random question directed to those who have experienced hurricanes and lengthy power outages.

Besides the typical hurricane supplies we are all familiar with, what item or items do you consider to be invaluable either during or after a storm that is not commonly thought of?

thanks


Fill the bathtub. I did not think to do it with Wilma. Would have helped a lot.
Member Since: July 30, 2008 Posts: 0 Comments: 261
635. hydrus 5:33 PM GMT on June 21, 2010    
Link.... Audrey. 1957.
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636. Levi32 5:33 PM GMT on June 21, 2010    
Floater up.

Member Since: November 24, 2005 Posts: 586 Comments: 25459
638. reedzone 5:33 PM GMT on June 21, 2010    
NHC has the floater positioned on 93L, only problem is, it says 92L lol.. Looking closely at the visible, I see a small spin 14.2N 68.5W. I believe that is where the LLC might form in the next 24-40 hours.
Member Since: July 1, 2008 Posts: 13 Comments: 7247
639. thegoldenstrand 5:34 PM GMT on June 21, 2010    
Quoting TampaTom:


Allen - 1980..


Nope, more like Audrey... but only if it gets spinning soon or the disturbance behind it will be the one to watch.
Member Since: August 16, 2008 Posts: 0 Comments: 102
640. tornadodude 5:34 PM GMT on June 21, 2010    
Quoting Baltimorebirds:
I can't belive people are forgetting that andrew was the first named storm,and it was a cat'5


people arent forgetting, we just dont mention it. there are some storms that are better off not being mentioned due to the traumatic impact they have had on many of the bloggers here.
Member Since: June 28, 2006 Posts: 22 Comments: 7816
642. hydrus 5:34 PM GMT on June 21, 2010    
Quoting TampaTom:


Allen - 1980..
Sorry. I thought he meant June storms.
Member Since: September 27, 2007 Posts: 1 Comments: 14314
643. boyzNme 5:34 PM GMT on June 21, 2010    
Quoting leelee75k:
tampa, but what if you don't have a garage? would you then bring them inside the house?


did you see the dishwasher comment? I think it was patrap that said after katrina they found everything in a dishwasher completely spotless.
Member Since: August 29, 2008 Posts: 5 Comments: 58
646. TampaTom 5:35 PM GMT on June 21, 2010    
Quoting hydrus:
Sorry. I thought he meant June storms.


Look at me. Do I look upset to you?
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648. xcool 5:36 PM GMT on June 21, 2010    
favorable pattern START NOW.
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649. PalmBeachWeatherBoy 5:36 PM GMT on June 21, 2010    
Should we be looking at normal July tracks if 93L develops or are the tropics still in a June type track pattern?
Member Since: August 30, 2006 Posts: 1 Comments: 433
650. 69Viking 5:36 PM GMT on June 21, 2010    
Quoting leelee75k:
thanks boyznme!

Another great suggestion and one I didn't think of.


Has anyone said fans? If you live where hurricanes hit it means you live where it's good and hot well into possibly October so fans come in really handy at keeping you cool! That is if you have a generator to power them.
Member Since: August 25, 2006 Posts: 0 Comments: 2247
651. StormGoddess 5:37 PM GMT on June 21, 2010    
Quoting leelee75k:
Thanks patrap, that's exactly the type of things I'm looking for, didn't think of either one of those to have.

anyone else?

Having a piece of flint to start a fire to stay warm (and cook with if you don't have propane) is always a great thing. Also, if you need water right away and don't have any stored or you have lost your supplies for one reason or another, the tablets to sterilize water are good to have. Also to have a little backpack or something with all your supplies together in one place in case you have to evacuate all of a sudden is always useful as well.
Member Since: June 10, 2010 Posts: 6 Comments: 570

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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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