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 en Junio 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
  Permalink | A A A
Reader Comments
Display: 0, 50, 100, 200 Sort: Newest First - Order Posted
Viewing: 1951 - 2001

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79Blog Index

1951. all4hurricanes 11:13 PM GMT en Junio 21, 2010    
You're all right but it went by another name
5 points for the other name
50 for the explanation
Member Since: Marzo 29, 2008 Posts: 0 Comments: 2192
1953. cg2916 11:13 PM GMT en Junio 21, 2010    
Quoting amd:


I think the wave behind 93L is the bigger threat. It has a much stronger circulation at 850mb compared to 93L, and has more time for the shear to completely lessen in the Caribbean.



Disorganized, though.
Member Since: Diciembre 21, 2007 Posts: 13 Comments: 2908
1954. Levi32 11:13 PM GMT en Junio 21, 2010    
Out to play tennis. Back later.
Member Since: Noviembre 24, 2005 Posts: 586 Comments: 25445
1956. LoneStarWeather 11:14 PM GMT en Junio 21, 2010    
Quoting Patrap:


He was a Good Man for sure..and very modest as well

The truly good ones always are.
Member Since: Septiembre 8, 2001 Posts: 0 Comments: 391
1958. cg2916 11:15 PM GMT en Junio 21, 2010    
Quoting Claudette1234:


93L ASCAT uhmm could be dangerous


Looks like an LLC is trying to form, but not there yet. You can see a donut of wind, but half of it is going the wrong way.
Member Since: Diciembre 21, 2007 Posts: 13 Comments: 2908
1959. centex 11:16 PM GMT en Junio 21, 2010    
It's got alot of potential but needs more time, maybe couple more days.
Member Since: Agosto 10, 2007 Posts: 0 Comments: 2856
1960. tropicaltank 11:16 PM GMT en Junio 21, 2010    
Quoting Chicklit:
bingo.
the problem with the entire scenario is everything is in place for rapid intensification which models cannot handle.
What would be the first sign of rapid intensfication?
Member Since: Junio 27, 2009 Posts: 0 Comments: 242
1961. cg2916 11:16 PM GMT en Junio 21, 2010    
The 1869 Saxby Gale:

On October 4, a hurricane was first observed east of South Carolina. It moved rapidly northeastward, hitting Cape Cod on the 5th and Maine later that day. It turned northeastward, dissipating over northern New Brunswick that night. The storm caused widespread damage, as well as 37 deaths.

The storm is known as the Saxby Gale because of a prediction by Stephen Martin Saxby on December 25, 1868. However, he gave no mention of the location of the storm. Another person, Frederick Allison, gave detail of where and when it was going to hit. Nonetheless, when the storm happened, more remembered Saxby's prediction.
Member Since: Diciembre 21, 2007 Posts: 13 Comments: 2908
1963. Chicklit 11:17 PM GMT en Junio 21, 2010    


thanks!
Member Since: Julio 11, 2006 Posts: 14 Comments: 10253
1964. GatorWX 11:17 PM GMT en Junio 21, 2010    
Quoting Chicklit:
I wish someone would address the wave at 55-60 and tell us what effect this and 93L will have on each other. Typically, the stronger one will take over. Looks like the eastern wave has a surface low but not much else and 93L is just the opposite!


I have, and yes it does have a decent amount of vorticity, but it's embedded in the itcz, so in the very short term, 93 is the one to watch, and despite what the models say and yes, convection has waned a bit, I think its presentation on satellite has improved dramatically since this morning. I suspect the next cimss vorticity map will have a bit more yellows and oranges. After 36 hrs, I think the next wave will have a much better chance and it could have a shot. The second wave is kind of close to 93 and SA to develop right away. We will see! Right now, they are both rather similar in appearance and development, but like I stated above, 93 has a lot more going for it in the near term.
Member Since: Enero 1, 2008 Posts: 0 Comments: 633
1965. Patrap 11:17 PM GMT en Junio 21, 2010    
Member Since: Julio 3, 2005 Posts: 370 Comments: 111334
1966. cg2916 11:18 PM GMT en Junio 21, 2010    
Quoting tropicaltank:
What would be the first sign of rapid intensfication?


It rapidly intensifying.
Member Since: Diciembre 21, 2007 Posts: 13 Comments: 2908
1967. FMTXWMAN 11:18 PM GMT en Junio 21, 2010    
http://cimss.ssec.wisc.edu/tropic/real-time/tpw2/natl/main.html

Pretty interesting graphic, shows some circulation, just do not know how they extrapolate it into the animation.
Member Since: Mayo 1, 2007 Posts: 2 Comments: 66
1968. all4hurricanes 11:18 PM GMT en Junio 21, 2010    
the point was to test your knowledge not to get it right I guess that's why my last question was so hard all the cheaters went silent
Member Since: Marzo 29, 2008 Posts: 0 Comments: 2192
1970. Chicklit 11:19 PM GMT en Junio 21, 2010    
Quoting tropicaltank:
What would be the first sign of rapid intensfication?
finding the low level center and wrapping (counter clockwise)... thanks guys, by the way, for answering my question! now i can leave for a while...
Member Since: Julio 11, 2006 Posts: 14 Comments: 10253
1971. xcool 11:19 PM GMT en Junio 21, 2010    
oh snap
Member Since: Septiembre 26, 2009 Posts: 2 Comments: 15501
1972. GatorWX 11:19 PM GMT en Junio 21, 2010    
I'm really interested in the banding 93 is presenting. Could develop a closed surface low very soon..imo. Is looking good despite the relative lack of deep convection near what you could call the center.
Member Since: Enero 1, 2008 Posts: 0 Comments: 633
1973. Hurricanes101 11:19 PM GMT en Junio 21, 2010    
Quoting all4hurricanes:
the point was to test your knowledge not to get it right I guess that's why my last question was so hard all the cheaters went silent


or we just stopped caring lol
Member Since: Marzo 10, 2010 Posts: 1 Comments: 6902
1974. cg2916 11:19 PM GMT en Junio 21, 2010    
Quoting GatorWX:


I have, and yes it does have a decent amount of vorticity, but it's embedded in the itcz, so in the very short term, 93 is the one to watch, and despite what the models say and yes, convection has waned a bit, I think its presentation on satellite has improved dramatically since this morning. I suspect the next cimss vorticity map will have a bit more yellows and oranges. After 36 hrs, I think the next wave will have a much better chance and it could have a shot. The second wave is kind of close to 93 and SA to develop right away. We will see! Right now, they are both rather similar in appearance and development, but like I stated above, 93 has a lot more going for it in the near term.


93L just hit DMIN.
Member Since: Diciembre 21, 2007 Posts: 13 Comments: 2908
1975. Patrap 11:21 PM GMT en Junio 21, 2010    
Viz



WV



RGB to (Night IR)


Rainbow
Member Since: Julio 3, 2005 Posts: 370 Comments: 111334
1977. marmark 11:21 PM GMT en Junio 21, 2010    
Quoting cg2916:


It rapidly intensifying.
jer...
Member Since: Febrero 1, 2004 Posts: 2 Comments: 238
1978. centex 11:21 PM GMT en Junio 21, 2010    
Don't be too fooled by visible, the early evening contrast can be deceiving.
Member Since: Agosto 10, 2007 Posts: 0 Comments: 2856
1979. 954FtLCane 11:22 PM GMT en Junio 21, 2010    
Quoting all4hurricanes:
You're all right but it went by another name
5 points for the other name
50 for the explanation

the september gale..ding ding
Member Since: Septiembre 30, 2008 Posts: 0 Comments: 1464
1980. tropicaltank 11:22 PM GMT en Junio 21, 2010    
I believe we will break the John Hope rule,regarding cyclogenesis in the Carib.
Member Since: Junio 27, 2009 Posts: 0 Comments: 242
1981. all4hurricanes 11:23 PM GMT en Junio 21, 2010    
1961 you said more than I knew but you gave no mention to how Saxby made his prediction it is a crucial part of the tale
Member Since: Marzo 29, 2008 Posts: 0 Comments: 2192
1982. GatorWX 11:23 PM GMT en Junio 21, 2010    
Quoting WinterAnalystwx13:


Wind Shear is low across the whole Caribbean.


Not completely, shear is between 15-25kts between Haiti and the Yucatan, N of 15n. You can see the clouds ahead of 93 and on its w side being sheared just a bit. Is lessening though. 93 is the one to watch in the short term, imo.
Member Since: Enero 1, 2008 Posts: 0 Comments: 633
1983. Patrap 11:23 PM GMT en Junio 21, 2010    
Member Since: Julio 3, 2005 Posts: 370 Comments: 111334
1984. tropicaltank 11:23 PM GMT en Junio 21, 2010    
Pretty good shape for DMIN.
Member Since: Junio 27, 2009 Posts: 0 Comments: 242
1985. cg2916 11:24 PM GMT en Junio 21, 2010    
Try tinypic, then people can't cheat.
Member Since: Diciembre 21, 2007 Posts: 13 Comments: 2908
1986. GatorWX 11:24 PM GMT en Junio 21, 2010    
Quoting tropicaltank:
What would be the first sign of rapid intensfication?


A tropical depression or storm forming.
Member Since: Enero 1, 2008 Posts: 0 Comments: 633
1987. CaneWarning 11:24 PM GMT en Junio 21, 2010    
Wow, look at the intensity models. Some show a major hurricane, and some RIP it. LOL
Member Since: Abril 26, 2009 Posts: 3 Comments: 3667
1988. Patrap 11:24 PM GMT en Junio 21, 2010    
93L Floater - RGB Color Infrared Loop

Be sure to check the SST and MSLP Box
Member Since: Julio 3, 2005 Posts: 370 Comments: 111334
1989. Tazmanian 11:24 PM GMT en Junio 21, 2010    
93L is rapidly intensifying.
Member Since: Mayo 21, 2006 Posts: 5088 Comments: 111341
1990. Tazmanian 11:25 PM GMT en Junio 21, 2010    
Quoting CaneWarning:
Wow, look at the intensity models. Some show a major hurricane, and some RIP it. LOL



yup lol
Member Since: Mayo 21, 2006 Posts: 5088 Comments: 111341
1991. Tazmanian 11:25 PM GMT en Junio 21, 2010    
i now see a pine hole eye with 93L
Member Since: Mayo 21, 2006 Posts: 5088 Comments: 111341
1993. BahaHurican 11:25 PM GMT en Junio 21, 2010    
While we're admiring our 30% in the ATL, the EPac is practically frothing.... lol

Member Since: Octubre 25, 2005 Posts: 19 Comments: 17631
1994. centex 11:25 PM GMT en Junio 21, 2010    
Quoting tropicaltank:
I believe we will break the John Hope rule,regarding cyclogenesis in the Carib.
I don't think that applies after SA.
Member Since: Agosto 10, 2007 Posts: 0 Comments: 2856
1996. Tazmanian 11:26 PM GMT en Junio 21, 2010    
Quoting BahaHurican:
While we're admiring our 30% in the ATL, the EPac is practically frothing.... lol





i see a downgrade comeing for 95E
Member Since: Mayo 21, 2006 Posts: 5088 Comments: 111341
1997. Hurricanes101 11:26 PM GMT en Junio 21, 2010    
Taz you are on the fast track to many peoples' ignore lists if you keep posting that way
Member Since: Marzo 10, 2010 Posts: 1 Comments: 6902
1998. Drakoen 11:27 PM GMT en Junio 21, 2010    
Quoting Tazmanian:
i now see a pine hole eye with 93L


Not march logger?
Member Since: Octubre 28, 2006 Posts: 57 Comments: 29010
2000. Tazmanian 11:27 PM GMT en Junio 21, 2010    
Quoting Hurricanes101:
Taz you are on the fast track to many peoples' ignore lists if you keep posting that way



lol



cant i have a little fun lol
Member Since: Mayo 21, 2006 Posts: 5088 Comments: 111341
2001. tennisgirl08 11:27 PM GMT en Junio 21, 2010    
My thoughts on 93L:

next update - will remain the same (medium - 30%)

red circle sometime tomorrow or tomorrow night

Could jump straight to TS Alex status by Thurs or Friday in the Western Caribbean.
Member Since: Julio 17, 2008 Posts: 0 Comments: 1242

Viewing: 1951 - 2001

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79Blog Index

New Comment
Community Standards Policy Comments will take a few seconds to appear.
Post Your Comments
Please sign in to post comments.
Not only will you be able to leave comments on this blog, but you'll also have the ability to upload and share your photos in our Wunder Photos section.
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.

Local Weather
Clear
81 ° F
Despejado
Community Activity