ATL : EX TOMAS - Discussion

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#21 Postby HURAKAN » Wed Oct 27, 2010 8:27 pm

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#22 Postby HURAKAN » Wed Oct 27, 2010 8:47 pm

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#23 Postby Dean4Storms » Wed Oct 27, 2010 8:58 pm

From the looks of the size I would think it takes longer to develop than a small system would. If it does develop it looks like a large storm.
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Re: ATL : INVEST 91L - Discussion

#24 Postby GCANE » Wed Oct 27, 2010 9:12 pm

Core is a bit wider than normal and LLC still has wave-type LL winds.

Along with it being below 10N, IHMO I agree that it will take some time to spin up.

Impressive though that convection continues to deepen as shear is dropping due in part to the anti-cyclone overhead.


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#25 Postby Florida1118 » Thu Oct 28, 2010 12:48 am

A VIGOROUS TROPICAL WAVE IS LOCATED OVER THE TROPICAL ATLANTIC
ABOUT 1050 MILES EAST-SOUTHEAST OF THE WINDWARD ISLANDS.
ENVIRONMENTAL CONDITIONS APPEAR FAVORABLE FOR SOME SLOW DEVELOPMENT
OF THIS SYSTEM DURING THE NEXT COUPLE OF DAYS. THERE IS A LOW
CHANCE...20 PERCENT...OF THIS SYSTEM BECOMING A TROPICAL CYCLONE
DURING THE NEXT 48 HOURS AS IT MOVES WESTWARD OR WEST-NORTHWESTWARD
AT 15 TO 20 MPH.

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#26 Postby Gustywind » Thu Oct 28, 2010 4:28 am

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#27 Postby Gustywind » Thu Oct 28, 2010 6:10 am

000
AXNT20 KNHC 280553
TWDAT

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
205 AM EDT THU OCT 28 2010

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTIONS OF
SOUTH AMERICA...AND ATLANTIC OCEAN TO THE AFRICAN COAST FROM THE
EQUATOR TO 32N. THE FOLLOWING INFORMATION IS BASED ON SATELLITE
IMAGERY...METEOROLOGICAL ANALYSIS...WEATHER OBSERVATIONS...AND
RADAR.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
0515 UTC.

...TROPICAL WAVES...

TROPICAL WAVE EXTENDS FROM 13N42W THROUGH A 1008 MB LOW NEAR
6N45W TO 2N45W MOVING W 15-20 KT. WAVE REMAINS EMBEDDED WITHIN A
BROAD MID LEVEL CYCLONIC ROTATION CENTERED JUST TO THE E OF THE
LOW CENTER.
SCATTERED TO NUMEROUS STRONG CONVECTION IS FROM
8N-12N BETWEEN 41W-49W. CLUSTERS OF SCATTERED MODERATE/STRONG
CONVECTION COVERS THE REMAINDER OF THE AREA FROM 3N-14N BETWEEN
40W-52W.

$$
PAW
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#28 Postby HURAKAN » Thu Oct 28, 2010 6:15 am

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Re: ATL : INVEST 91L - Discussion

#29 Postby Blown Away » Thu Oct 28, 2010 6:29 am

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72 Hour TAFB has 91L's low just north of SA.
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Re: ATL : INVEST 91L - Discussion

#30 Postby cycloneye » Thu Oct 28, 2010 6:43 am

ABNT20 KNHC 281137
TWOAT
TROPICAL WEATHER OUTLOOK
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
800 AM EDT THU OCT 28 2010

FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...

SHOWER AND THUNDERSTORM ACTIVITY ASSOCIATED WITH A LOW PRESSURE
SYSTEM LOCATED ABOUT 1200 MILES NORTHWEST OF THE NORTHERNMOST CAPE
VERDE ISLANDS HAS BECOMES LESS ORGANIZED OVER THE PAST FEW HOURS.
SATELLITE DATA INDICATE THAT THE LOW IS PRODUCING WINDS TO GALE
FORCE. ALTHOUGH UPPER-LEVEL WINDS ARE ONLY MARGINALLY CONDUCIVE
FOR DEVELOPMENT...AN INCREASE IN ORGANIZATION COULD RESULT IN THE
FORMATION OF A TROPICAL STORM. THERE IS A MEDIUM CHANCE...50
PERCENT...OF THIS SYSTEM BECOMING A TROPICAL CYCLONE DURING THE
NEXT 48 HOURS AS IT MOVES SLOWLY WESTWARD.

SATELLITE IMAGES AND SURFACE OBSERVATIONS INDICATE THAT A SURFACE
LOW IS FORMING WITHIN A DEEP-LAYER TROUGH LOCATED ABOUT 700 MILES
SOUTH-SOUTHEAST OF BERMUDA. SHOWER AND THUNDERSTORM ACTIVITY HAS
CHANGED LITTLE DURING THE LAST FEW HOURS. HOWEVER...ENVIRONMENTAL
CONDITIONS ARE BECOMING MORE CONDUCIVE FOR THE DEVELOPMENT OF A
TROPICAL OR SUBTROPICAL DEPRESSION DURING THE NEXT DAY OR TWO.
THERE IS A HIGH CHANCE...60 PERCENT...OF THIS SYSTEM BECOMING A
SUBTROPICAL OR TROPICAL CYCLONE DURING THE NEXT 48 HOURS AS IT
MOVES WEST-NORTHWESTWARD NEAR 15 MPH.

A VIGOROUS TROPICAL WAVE LOCATED OVER THE TROPICAL ATLANTIC
ABOUT 1000 MILES EAST-SOUTHEAST OF THE WINDWARD ISLANDS IS PRODUCING
A LARGE AREA OF SHOWERS AND THUNDERSTORMS. ENVIRONMENTAL
CONDITIONS APPEAR FAVORABLE FOR SOME SLOW DEVELOPMENT OF THIS
SYSTEM DURING THE NEXT COUPLE OF DAYS. THERE IS A LOW CHANCE...20
PERCENT...OF THIS SYSTEM BECOMING A TROPICAL CYCLONE DURING THE
NEXT 48 HOURS AS IT MOVES WESTWARD OR WEST-NORTHWESTWARD AT 15 TO
20 MPH.

ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.

$$
FORECASTER CANGIALOSI/PASCH
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#31 Postby HURRICANELONNY » Thu Oct 28, 2010 6:47 am

A 1008mb low between 6n-2n? I can't see anything resembling a low at 2n.
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#32 Postby Gustywind » Thu Oct 28, 2010 7:21 am

Pressure down to 1006 hpa...
000
AXNT20 KNHC 281141
TWDAT

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT THU OCT 28 2010

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTIONS OF
SOUTH AMERICA...AND ATLANTIC OCEAN TO THE AFRICAN COAST FROM THE
EQUATOR TO 32N. THE FOLLOWING INFORMATION IS BASED ON SATELLITE
IMAGERY...METEOROLOGICAL ANALYSIS...WEATHER OBSERVATIONS...AND
RADAR.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
1045 UTC.


...TROPICAL WAVES...

TROPICAL WAVE EXTENDS FROM 11N45W THROUGH A 1006 MB LOW NEAR
6N47W TO 3N48W MOVING W 15-20 KT. WAVE REMAINS EMBEDDED WITHIN A
BROAD MID LEVEL CYCLONIC ROTATION CENTERED NEAR THE LOW CENTER.
SCATTERED/NUMEROUS STRONG CONVECTION IS WITHIN 90 NM W OF THE
WAVE AXIS FROM 5N-9N WITH CLUSTERS OF SCATTERED MODERATE/STRONG
CONVECTION COVERING THE REMAINDER OF THE AREA FROM 3N-14N
BETWEEN 41W-52W.

$$
PAW
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#33 Postby HURAKAN » Thu Oct 28, 2010 7:36 am

AL, 91, 2010102812, , BEST, 0, 72N, 486W, 30, 1006, DB

slowly gaining latitude
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#34 Postby Gustywind » Thu Oct 28, 2010 7:50 am

From Crown Weather :rarrow: http://www.crownweather.com/?page_id=325
Atlantic Tropical Weather Discussion
Issued: Thursday, October 28, 2010 605 am ET/505 am CT

Invest 91-L Located About 1000 Miles East-Southeast Of The Windward Islands:

I am closely following a fairly strong tropical disturbance which is located about 1000 miles east-southeast of the Windward Islands. Slow, but steady development is likely from this system, which is designated Invest 91-L by the National Hurricane Center. This is the same feature that the model guidance have been developing into a tropical cyclone in the Caribbean. This morning’s global model guidance is no different and continues to forecast tropical cyclone development over the next few days. Current analysis of surface and upper air maps support the model forecasts as upper level conditions are expected to become favorable for development within the next couple of days or so.

Satellite loops this morning showed a system that is well-organized with notable low-level turning in the clouds. Based on the current state of this system and the forecast for favorable environmental conditions, I think this will be upgraded to a tropical depression by or before Saturday evening.

So, let’s take a look at both the global model guidance and the hurricane track model guidance from this morning:

The GFS operational model forecasts that this system will wait to develop into a tropical cyclone until it is in the southeast Caribbean on Sunday. After that, it forecasts this system to develop and intensify in the central Caribbean early next week and forecasts it to track across Hispaniola next Thursday. The GFS model then forecasts this system to become absorbed into a strong coastal storm tracking off of the Mid-Atlantic and New England coastlines next Friday. It should be noted that the GFS ensemble guidance is much different than its operational counterpart and forecasts this system to not become entrained by the deep Eastern US trough, but instead forecasts a scenario that has it hanging around the western and central Caribbean for pretty much all of next week.

The European operational model forecasts this system to try and develop before getting into the Caribbean and forecasts a track that takes it over Trinidad, Tobago and Grenada during Saturday. After that, the European model forecasts this system to initially track west-northwestward to about 80 West Longitude in the Caribbean on Wednesday and forecasts a scenario that shows this system hanging around south of Jamaica through at least next Saturday.

The European ensemble guidance is trending towards a scenario that shows a ridge of high pressure hanging around longer causing this system to hang back in the western Caribbean and not be picked up by the Eastern US trough.

The Canadian model forecasts a scenario that shows development and intensification before it reaches the Windward Islands and takes it across the Windward Islands and just south of Barbados on Saturday. Once in the eastern Caribbean, the Canadian model forecasts this system to intensify into a fairly strong storm during Sunday and Monday and forecasts a track that would take it over Hispaniola on Tuesday night and over the southeastern Bahamas late Wednesday and Wednesday night and then out into the open Atlantic after that.

I do not believe the hurricane track models like the BAM models as it is forecasting a track that has it crashing into South America. The HWRF model, however, is a little more believable as it forecasts a west-northwest track over the next couple of days and forecasts this system to track right over Barbados late Saturday as a tropical storm and then right over Martinique as a upper end tropical storm early Sunday morning. After that, the HWRF model forecasts this system to slow way down in the eastern Caribbean and intensify, so that by late Monday night it is forecast to be located near 16 North Latitude, 65 West Longitude as a Category 2 hurricane.

So, this is what I’m thinking this morning: I think Invest 91-L will track westward over the next 24 to 36 hours and then turn more to the west-northwest as it encounters a weakness in a ridge of high pressure. This should cause Invest 91-L to miss South America and instead track about halfway between Tabago and Barbados and then over St. Vincent during Saturday as perhaps a 50 to 60 mph tropical storm. After that, Invest 91-L is forecast to track into the eastern Caribbean late this weekend and then slowly track towards the central Caribbean early next week and be near 16 North Latitude, 69 West Longitude in 5 days from now or on Tuesday morning as a upper end Category 1 or low end Category 2 hurricane. After that, who knows as there is an equal chance of either this system being picked up by the East Coast trough or be left behind just south of Jamaica by later next week.

So, all interests in the Windward Islands, Trinidad, Tobago and Barbados should closely monitor the progress of this system as Invest 91-L may be on your doorstep in just 48 hours as a tropical storm. In addition, all interests in the Caribbean, especially those in Jamaica, eastern Cuba, Haiti and the Dominican Republic should keep close tabs on this system. I will be keeping a close eye on this potential and will keep you all updated.
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#35 Postby HURAKAN » Thu Oct 28, 2010 8:22 am

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latest, impressive wave
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#36 Postby Gustywind » Thu Oct 28, 2010 8:30 am

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Re: ATL : INVEST 91L - Discussion

#37 Postby TheBurn » Thu Oct 28, 2010 9:01 am

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Re: ATL : INVEST 91L - Discussion

#38 Postby cycloneye » Thu Oct 28, 2010 9:28 am

Plane going tommorow afternoon if necessary.

2. SUSPECT AREA (APPROACHING WINDWARD ISLANDS)
FLIGHT ONE -- TEAL 71
A. 29/1800Z
B. AFXXX 01KKA INVEST
C. 29/1530Z
D. 09.5N 57.0W
E. 29/1730Z TO 29/2200Z
F. SFC TO 10,000 FT

3. SUCCEEDING DAY OUTLOOK: BEGIN 6-HRLY FIXES ON SYSTEM
NEAR THE WINDWARD ISLANDS AT 30/1200Z NEAR 11N 62W.
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#39 Postby HURAKAN » Thu Oct 28, 2010 9:35 am

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impressive wave
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Re:

#40 Postby GCANE » Thu Oct 28, 2010 9:39 am

HURAKAN wrote:impressive wave


Nice mid-level rotation.

PV anomoly looks to be elongated above the boundary layer but good structure at mid-levels.

Diabatic heating from convevction and sun could help lower level vorticity and push it more down to the surface today.


Image



Image


Image
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