000
AXNT20 KNHC 061136
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL  
805 AM EDT WED APR 06 2011

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL 
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTION 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.

...ITCZ...

FROM THE CENTRAL LIBERIA COAST...CROSSING THE EQUATOR ALONG 17W
TO 2S30W...INTO EXTREME NORTHEASTERN BRAZIL NEAR 3S44W. ISOLATED
MODERATE RAINSHOWERS TO LOCALLY STRONG THUNDERSTORMS ARE TO THE 
SOUTH OF 6N BETWEEN 7W AND 52W.

...DISCUSSION...

FROM THE ATLANTIC OCEAN THAT IS TO THE WEST OF 70W
INTO THE GULF OF MEXICO...
A DEEP LAYER TROUGH THAT IS ALONG THE U.S.A. EAST COAST
SUPPORTS THE COLD FRONT THAT PASSES THROUGH 32N72W IN THE 
ATLANTIC OCEAN...TO 26N ALONG THE SOUTHEASTERN FLORIDA COAST...
INTO THE SOUTH CENTRAL GULF OF MEXICO AND THE ISTHMUS OF 
TEHUANTEPEC IN MEXICO. GALE FORCE WINDS ARE BEING OBSERVED IN 
THE GULF OF TEHUANTEPEC ON THE PACIFIC OCEAN COAST OF MEXICO. 
MIDDLE LEVEL TO UPPER LEVEL NORTHWESTERLY AND WESTERLY WINDS 
COVER MUCH OF THE GULF OF MEXICO. SURFACE HIGH PRESSURE COVERS 
THE GULF OF MEXICO FROM SOUTHEASTERN ALABAMA AND THE FLORIDA 
PANHANDLE TOWARD THE MEXICO GULF COAST NEAR 20N97W. BROKEN TO 
OVERCAST MULTILAYERED CLOUDS AND POSSIBLE RAINSHOWERS ARE WITHIN 
240 NM TO THE WEST OF THE LINE THAT PASSES THROUGH BERMUDA TO
28N71W TO 24N80W. BROKEN HIGH CLOUDS ALSO ARE TO THE NORTH OF 
25N TO THE WEST OF 60W IN ADVANCE OF THE FRONT. RAINSHOWERS 
REMAIN FROM THE ISTHMUS OF TEHUANTEPEC TO CENTRAL GUATEMALA...
TAKING PLACE NEAR A SURFACE TROUGH.

CARIBBEAN SEA...
BROAD UPPER LEVEL ANTICYCLONIC FLOW MOVES AROUND AN UPPER LEVEL 
RIDGE THAT IS ORIENTED FROM VENEZUELA TOWARD CUBA. THE EARLIER
PRECIPITATION IN COLOMBIA HAS WEAKENED CONSIDERABLY. IT WAS 
ASSOCIATED WITH A NORTH-TO-SOUTH MIDDLE LEVEL TROUGH THAT REMAINS
IN THE AREA. OTHER RAINSHOWERS ARE SPREAD ACROSS THE REST OF THE 
AREA...IN CLOUDS THAT ARE MOVING WESTWARD WITH THE TRADEWIND 
FLOW.

ATLANTIC OCEAN TO THE EAST OF 70W...
A DEEP LAYER TROUGH PASSES THROUGH 32N31W TO 25N33W TO 22N37W.
THIS TROUGH SUPPORTS A COLD FRONT THAT PASSES THROUGH 32N28W TO
26N33W TO 23N41W. A SHEAR AXIS CONTINUES FROM 23N41W TO 22N48W 
AND 22N54W. PRECIPITATION IS POSSIBLE WITHIN 60 TO 75 NM ON 
EITHER SIDE OF THE LINE THAT PASSES THROUGH 32N25W 26N30W 
21N40W...AND WITHIN 60 TO 90 NM ON EITHER SIDE OF THE SHEAR 
AXIS. A BROAD AREA OF UPPER LEVEL CYCLONIC FLOW APPEARS TO BE 
CUT OFF FROM THE REST OF THE EARLIER TROUGH PATTERN...COVERING 
THE ATLANTIC OCEAN FROM 12N TO 20N BETWEEN 10W AND 20W. SURFACE 
ANTICYCLONIC FLOW COVERS THE ATLANTIC OCEAN TO THE NORTH OF THE 
FRONT/SHEAR AXIS...MOVING AROUND A 1029 MB HIGH PRESSURE CENTER 
THAT IS NEAR 34N48W.

FOR ADDITIONAL INFORMATION PLEASE VISIT
HTTP://WWW.HURRICANES.GOV/MARINE

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MT