Karen defeated; new disturbance a threat to the Gulf of Mexico
Wind shear put an end to Tropical Storm Karen yesterday. Karen's remains continue to generate a large area of disturbed weather a few hundred miles east of the northern Lesser Antilles Islands (Figure 1). This morning's QuikSCAT pass showed some rotation still exists near the surface, with winds up to 30 mph. Wind shear has fallen to 20 knots over Karen's remains, and some of the models forecast the shear will fall below 15 knots by Tuesday, which may allow redevelopment of the storm. Both the UKMET and NOGAPS model revive Karen later this week, and show it moving very slowly to the west towards the U.S., but well offshore. The GFS model keeps the shear high, and does not redevelop Karen.

Figure 1. This morning's visible satellite image.
Bahamas tropical disturbance
A potential significant threat area has developed today off the U.S. East Coast along an old frontal boundary. Several areas of heavy thunderstorm activity have started firing up along this old front. Wind shear is about 20 knots over the region today, so only slow development will occur. By Tuesday, the shear is forecast to drop below 15 knots, and most of the computer models are forecasting that a tropical depression will form near Florida or Cuba. This storm is forecast to move westward across the Gulf of Mexico, pushed by a strong ridge of high pressure expected to build in. An upper-level anticyclone aloft is expected to develop as well, providing an environment favorable for intensification. The UKMET model is forecasting a strong tropical storm or weak hurricane by Friday for the Texas/Mexico border region. The other models are not so aggressive, but all see the possibility of a tropical storm impacting the western Gulf of Mexico in Louisiana, Texas, or Mexico sometime Thursday through Saturday. The Hurricane Hunters are on call to fly into this system Tuesday afternoon, if necessary. Texas is at highest risk from this potential storm.
Melissa
Tropical Depression Melissa is not long for this world, thanks to wind shear of 15-20 knots that is expected to increase further as Melissa heads northwest. Melissa is not a threat to any land areas, and will not be around three days from now.
I'll have an update Monday.
Jeff Masters
Reader Comments
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MOistur coming into the GOM.
The tropics are unpredictable, but none of those blobs look like they have a chance.
I don't think any of these blobs will develop. Probably will have a quiet few days in the tropics for now.
The tropics are unpredictable, but none of those blobs look like they have a chance.
Well, we have the Bahamas/South Florida diturbance which seems likely enough to become Noel. And, not to mention, we may have the remains of Karen and Melissa returning. So, I think that may be our only activity for the next week.
Could we sts Noel soon and will it affect the n. GOM like tx and or la.???
IMO, I think it will strenghten to minimal TS/STS strength prior to S. Fla landfall...it then enters the gulf and becomes a weak cat 2. at landfall in southern texas- maybe northern mexico. Though IF this becomes a subtropical storm, wouldn't it seem kinda funny having one of those in the warm GOM? Out of all places...
TWOAT
TROPICAL WEATHER OUTLOOK
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1030 PM EDT SUN SEP 30 2007
FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...
A LARGE BUT DISORGANIZED AREA OF CLOUDINESS AND A FEW THUNDERSTORMS
IS LOCATED OVER THE WESTERN ATLANTIC...BAHAMA ISLANDS...AND
PORTIONS OF SOUTH FLORIDA. THIS ACTIVITY IS ASSOCIATED WITH AN
UPPER-LEVEL TROUGH AND A WEAK SURFACE LOW. SOME SLOW
DEVELOPMENT...PERHAPS OF A SUBTROPICAL NATURE...IS POSSIBLE DURING
THE NEXT COUPLE OF DAYS AS THIS SYSTEM MOVES SLOWLY WESTWARD OR
WEST-SOUTHWESTWARD.
DISORGANIZED CLOUDINESS AND THUNDERSTORMS...THE REMNANTS OF
KAREN...EXTEND FROM THE LEEWARD ISLANDS EASTWARD FOR SEVERAL
HUNDRED MILES. THE STRONG UPPER-LEVEL WINDS IN THIS AREA COULD
WEAKEN A LITTLE DURING THE NEXT COUPLE OF DAYS...BUT ANY
DEVELOPMENT OF THIS SYSTEM IS EXPECTED TO BE SLOW TO OCCUR AS IT
MOVES NORTHWESTWARD AT 10 TO 15 MPH.
THE REMNANT LOW OF TROPICAL DEPRESSION MELISSA IS LOCATED
ABOUT 675 MILES WEST OF THE CAPE VERDE ISLANDS AND IS MOVING
WEST-NORTHWESTWARD AT 10 TO 15 MPH. THIS SYSTEM IS PRODUCING ONLY
LIMITED AND INTERMITTENT THUNDERSTORM ACTIVITY...AND REGENERATION
APPEARS UNLIKELY DUE TO STRONG UPPER-LEVEL WINDS.
FOR MORE INFORMATION ON THE REMNANTS OF KAREN AND MELISSA...PLEASE
SEE THE HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER
SERVICE...UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER FZNT01 KWBC.
ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.
$$
FORECASTER KNABB
Link (Decending pass...didnt look like anything on the ascending pass either)
Link
Loop removed due to size.
NO!-L
Aww. Quickscat missed the center! Well, atleast it got most of it. Strong winds, some are TS force.
thanks do you have a location for it tia
48 HOUR FORECAST
Link
26N, 73W I believe.
thanks right it hasnt move much today at all waiting for dmax
also accuweather last night said a ts at 1002 for miami on mon they may have been a day early looks more like tues or wend as this blob go west and could be sts noel before its approch what you think ?
Link
A potential significant threat area has developed today off the U.S. East Coast along an old frontal boundary. Several areas of heavy thunderstorm activity have started firing up along this old front. Wind shear is about 20 knots over the region today, so only slow development will occur. By Tuesday, the shear is forecast to drop below 15 knots, and most of the computer models are forecasting that a tropical depression will form near Florida or Cuba. This storm is forecast to move westward across the Gulf of Mexico, pushed by a strong ridge of high pressure expected to build in. An upper-level anticyclone aloft is expected to develop as well, providing an environment favorable for intensification. The UKMET model is forecasting a strong tropical storm or weak hurricane by Friday for the Texas/Mexico border region. The other models are not so aggressive, but all see the possibility of a tropical storm impacting the western Gulf of Mexico in Louisiana, Texas, or Mexico sometime Thursday through Saturday. The Hurricane Hunters are on call to fly into this system Tuesday afternoon, if necessary. Texas is at highest risk from this potential storm.
...steering confirms that movement Patrap. Also, Sfury, that blob should track westwards accordingly, too.
--Patrap, have a good sleep!
...lots of shear in the GOM in the present.
...some shear in front of the cAtl blob, but low now.
Shear expected to drop in many areas in the next 24hrs. Bound to get something to spin up soon.
...vorticity shows the areas of concern.
Rain wasn't too bad though.
I've been in a Cat 4 here in Florida where the winds peaked about 130-140 in this area and it seemed like my home windows were about at there limit. So wondering if car windows have hurricane limits also.
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