000
AXNT20 KNHC 211722
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
105 PM EST TUE FEB 21 2012

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...WEATHER OBSERVATIONS...RADAR...AND METEOROLOGICAL 
ANALYSIS.

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1700 UTC.

...THE ITCZ/THE MONSOON TROUGH...

THE MONSOON TROUGH PASSES THROUGH LIBERIA NEAR 6N10W TO 2N20W.
THE ITCZ CONTINUES FROM 2N20W TO 1N26W...CROSSING THE EQUATOR 
ALONG 36W...TO 1S39W. ISOLATED MODERATE RAINSHOWERS TO LOCALLY
STRONG THUNDERSTORMS ARE TO THE SOUTH OF THE LINE THAT PASSES 
THROUGH THE PRIME MERIDIAN NEAR 4N...TO 4N13W 3N25W 4N44W 8N59W.

...DISCUSSION...

THE GULF OF MEXICO...
A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH OHIO TO 
SOUTHERN ARKANSAS TO CENTRAL TEXAS. THIS TROUGH SUPPORTS
A COLD FRONT THAT PASSES THROUGH CENTRAL LOUISIANA TO THE UPPER 
TEXAS GULF COAST TO TEXAS ALONG THE MEXICO BORDER NEAR 28N100W.
UPPER LEVEL ANTICYCLONIC WIND FLOW COVERS THE GULF OF MEXICO. 
THIS FLOW MOVES FROM MEXICO TO THE GULF OF MEXICO...ACROSS 
FLORIDA AND THE BAHAMAS...INTO THE ATLANTIC OCEAN TO 65W.
 
THE CARIBBEAN SEA...
BROAD UPPER LEVEL ANTICYCLONIC WIND FLOW COVERS THE AREA.
A DISSIPATING STATIONARY FRONT CONTINUES FROM 22N77W IN THE 
ATLANTIC OCEAN...ACROSS CUBA TO THE WESTERN TIP OF CUBA.
BROKEN TO OVERCAST MULTILAYERED CLOUDS AND OTHER POSSIBLE 
RAINSHOWERS ARE WITHIN 30 TO 60 NM ON EITHER SIDE OF THE LINE 
THAT PASSES THROUGH 23N70W 21N75W.

THE ATLANTIC OCEAN...
A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH 32N54W
TO 26N56W TO 20N60W. THE TROUGH SUPPORTS A COLD FRONT THAT 
PASSES THROUGH 32N51W TO 26N60W 23N70W AND 22N77W. 
A DISSIPATING STATIONARY FRONT CONTINUES FROM 22N77W...ACROSS 
CUBA TO THE WESTERN TIP OF CUBA. GALE-FORCE WINDS ARE TO THE 
NORTH OF 30N WITHIN 180 TO 240 NM ON EITHER SIDE OF THE FRONT. 
RAINSHOWERS ARE WITHIN 30 NM ON EITHER SIDE OF THE LINE THAT 
PASSES THROUGH 32N47W TO 30N49W TO 28N52W. BROKEN TO OVERCAST 
MULTILAYERED CLOUDS AND OTHER POSSIBLE RAINSHOWERS ARE WITHIN
30 TO 60 NM ON EITHER SIDE OF THE LINE THAT PASSES THROUGH 
32N48W 28N54W 24N63W 23N70W 21N75W. BROAD SURFACE ANTICYCLONIC 
WIND FLOW IS TO THE NORTH AND NORTHWEST OF THE COLD FRONT.
A SURFACE RIDGE EXTENDS FROM A 1033 MB HIGH PRESSURE CENTER
THAT IS NEAR 36N20W TO 33N26W 30N33W 27N38W 22N49W TO 21N54W.
AN UPPER LEVEL TROUGH PASSES ACROSS THE WESTERN SAHARA
OF AFRICA TO 22N32W TO 17N46W TO 12N55W INTO WESTERN VENEZUELA.

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

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MT