000
AXNT20 KNHC 091157
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL  
705 AM EST WED MAR 09 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 1115 UTC.

...THE ITCZ...

FROM THE LIBERIA COAST NEAR 5N9W...CROSSING THE EQUATOR ALONG 
25W...INTO BRAZIL NEAR 5S50W. STRONG RAINSHOWERS AND 
THUNDERSTORMS ARE THE EQUATOR TO 6S BETWEEN 32W AND 40W 
INCLUDING IN BRAZIL'S COASTAL PLAINS. ISOLATED MODERATE 
RAINSHOWERS TO LOCALLY STRONG THUNDERSTORMS ARE ELSEWHERE
TO THE SOUTH OF 10N TO THE EAST OF 60W.

...DISCUSSION...

THE GULF OF MEXICO...
A MIDDLE LEVEL TO UPPER LEVEL TROUGH THAT IS MOVING THROUGH THE 
U.S.A. MIDWEST SUPPORTS A TEXAS COLD FRONT. STRONG RAINSHOWERS 
AND THUNDERSTORMS COVER THE U.S.A. FROM SOUTHEASTERN LOUISIANA 
TO ALABAMA. BROKEN TO OVERCAST LOW CLOUDS AND POSSIBLE HAZE
AND LIGHT RAIN ARE IN THE COASTAL PLAINS AND COASTAL WATERS
FROM SOUTH TEXAS TO THE FLORIDA PANHANDLE.

THE CARIBBEAN SEA...
A SURFACE RIDGE PASSES OVER THE BAHAMAS AND CUBA...INTO THE 
HONDURAS/NICARAGUA BORDER. RAINSHOWERS ARE POSSIBLE TO THE EAST 
OF 70W...IN CLUSTERS OF BROKEN LOW TO MIDDLE LEVEL CLOUDS THAT 
ARE MOVING SOUTHWESTWARD FROM THE ATLANTIC OCEAN. OTHER CLUSTERS 
OF SCATTERED TO BROKEN LOW CLOUDS AND POSSIBLE PRECIPITATION ARE
MOVING AWAY FROM HISPANIOLA...JAMAICA...AND CUBA...AND ARE TO 
THE NORTH AND NORTHEAST OF THE LINE THAT GOES FROM 22N84W TO 
13N80W TO 13N70W. 

THE REST OF THE ATLANTIC OCEAN...
UPPER LEVEL WESTERLY WIND FLOW MOVES ACROSS FLORIDA AND THE 
BAHAMAS TO 60W. A DISSIPATING STATIONARY FRONT ENDS JUST TO
THE WEST OF BERMUDA. A SURFACE TROUGH CONTINUES FROM JUST TO
THE WEST OF BERMUDA TO 28N66W AND 25N69W. BROKEN LOW CLOUDS
AND POSSIBLE RAINSHOWERS ARE WITHIN 30 NM ON EITHER SIDE OF
THE SURFACE TROUGH. A DEEP LAYER CENTRAL ATLANTIC OCEAN
TROUGH SUPPORTS THE SURFACE TROUGH THAT PASSES THROUGH 32N51W
TO A 1011 MB LOW PRESSURE CENTER THAT IS NEAR 25N49W.
GALE-FORCE WINDS ARE BEING EXPERIENCED TO THE NORTH OF 28N
TO THE EAST OF THE SURFACE TROUGH TO 38W. SEA HEIGHTS RANGE
FROM 10 FEET TO 18 FEET IN NORTHEASTERLY SWELL. BROKEN TO 
OVERCAST MULTILAYERED CLOUDS AND POSSIBLE RAINSHOWERS ARE TO
THE NORTH OF 25N BETWEEN 40W AND 51W. OTHER BROKEN TO OVERCAST 
MULTILAYERED CLOUDS AND AREAS OF POSSIBLE PRECIPITATION ARE TO 
THE NORTH OF 20N BETWEEN 20W AND 40W. A REMNANT CLOUD LINE IS 
ALONG 23N39W 18N45W 15N50W. BROKEN LOW CLOUDS AND POSSIBLE 
RAINSHOWERS ARE WITHIN 45 NM ON EITHER SIDE OF THE REMNANT CLOUD 
LINE. AN UPPER LEVEL CYCLONIC CENTER IS NEAR 35N14W IN WATER 
VAPOR IMAGERY. UPPER LEVEL CYCLONIC FLOW COVERS THE AREA THAT
IS TO THE NORTH OF 30N TO THE EAST OF 30W. UPPER LEVEL WESTERLY 
FLOW IS FROM 20N TO 30N TO THE EAST OF 40W. A 1006 MB LOW 
PRESSURE CENTER THAT IS HELPING TO PRODUCE GALE FORCE WINDS IS 
NEAR 35N12W. A DISSIPATING STATIONARY FRONT IS ALONG THE MOROCCO 
COAST NEAR 30N. A SURFACE TROUGH CONTINUES FROM 30N10W TO 26N19W.

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

$$
MT