000
AXNT20 KNHC 281131
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL  
805 AM EDT THU APR 28 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 1015 UTC.

...THE ITCZ...

FROM THE COASTAL BORDER OF SIERRA LEONE AND LIBERIA TO 3N20W...
CROSSING THE EQUATOR ALONG 22W...TO 4S24W AND BECOMING INDISTINCT
NEAR 7S28W. NUMEROUS STRONG RAINSHOWERS AND THUNDERSTORMS ARE 
FROM 3N TO 5N BETWEEN 13W AND 20W...AND FROM 2S TO 2N BETWEEN 
10W AND 20W. DISORGANIZED ISOLATED TO WIDELY SCATTERED MODERATE 
RAINSHOWERS AND LOCALLY STRONG THUNDERSTORMS ARE ELSEWHERE TO 
THE SOUTH OF 4N BETWEEN 20W AND NORTHWESTERN BRAZIL.

...DISCUSSION...

THE GULF OF MEXICO...

A COLD FRONT PASSES THROUGH THE NORTHWESTERN FLORIDA PANHANDLE
TO EXTREME SOUTHEASTERN LOUISIANA TO THE SOUTHWESTERN CORNER OF 
THE AREA...NEAR 20N98W IN MEXICO. STRONG RAINSHOWERS AND 
THUNDERSTORMS ARE IN SOUTHWESTERN GEORGIA. ISOLATED MODERATE
RAINSHOWERS ARE DEVELOPING FROM THE NORTH CENTRAL GULF WATERS 
NEAR 28N89W TOWARD THE FLORIDA PANHANDLE NEAR 31N85W.
BROAD SURFACE LOW PRESSURE COVERS MEXICO...FROM NORTHWEST TO 
SOUTHEAST...AND THEN EASTWARD FROM THE AREA WHERE THE COLD FRONT 
REACHES MEXICO TOWARD HONDURAS. ISOLATED MODERATE RAINSHOWERS 
ARE IN THE SOUTHERN HALF OF THE YUCATAN PENINSULA.

THE CARIBBEAN SEA...

BROKEN MULTILAYERED CLOUDS AND ISOLATED MODERATE RAINSHOWERS ARE 
FROM 10N TO 15N BETWEEN 55W AND 64W IN THE SOUTHEASTERN CORNER 
OF THE AREA. THE CLOUDS AND PRECIPITATION HAVE BEEN ASSOCIATED 
WITH BROAD SURFACE LOW PRESSURE/A SURFACE TROUGH FOR THE LAST 
FEW DAYS. THE TROUGH CURRENTLY IS NOT AS APPARENT/NOT THAT 
APPARENT BASED ON SEVERAL DATA SOURCES SUCH AS SATELLITE IMAGERY 
AND SCATTEROMETER WINDS. THE SENSIBLE WEATHER REMAINS EVEN IF 
A SURFACE TROUGH MAY NOT BE THAT APPARENT. THE NORTHEASTERN 
CORNER OF THE AREA APPEARS TO BE FEELING SOME OF THE EFFECTS OF 
BEING ALONG THE SOUTHERN SIDE OF THE UPPER LEVEL CYCLONIC FLOW
THAT IS FOUND WITHIN 150 NM ON EITHER SIDE OF 21N62W 29N72W
IN THE ATLANTIC OCEAN. LOW CLOUDS AND POSSIBLE RAINSHOWERS ARE 
TO THE NORTH OF 15N BETWEEN 60W AND 72W. NUMEROUS STRONG 
RAINSHOWERS AND THUNDERSTORMS ARE IN NORTHERN COLOMBIA AND 
COASTAL WATERS FROM 8N TO 10N BETWEEN 74W AND 78W. THIS 
PRECIPITATION IS TAKING PLACE NEAR BROAD EAST-TO-WEST ORIENTED
SURFACE LOW PRESSURE.

THE ATLANTIC OCEAN...

BROAD UPPER LEVEL CYCLONIC FLOW AND POSSIBLE PRECIPITATION ARE 
WITHIN 150 NM ON EITHER SIDE OF 21N62W 24N68W 29N72W. AN UPPER 
LEVEL CYCLONIC CIRCULATION CENTER IS NEAR 26N52W. CYCLONIC FLOW 
COVERS THE AREA TO THE NORTH OF 20N BETWEEN 47W AND 68W. BROAD 
UPPER LEVEL CYCLONIC FLOW WITH A TROUGH COVERS THE ATLANTIC 
OCEAN TO THE NORTH OF 20N BETWEEN AFRICA AND 40W. A 1010 MB LOW 
PRESSURE CENTER IS NEAR 32N18W. A COLD FRONT STRETCHES FROM THE 
LOW CENTER...ACROSS THE CANARY ISLANDS...TO 25N20W. A SURFACE
TROUGH CONTINUES FROM 25N20W TO 22N27W 21N36W. ISOLATED MODERATE 
RAINSHOWERS ARE TO THE NORTH OF 30N BETWEEN 14W AND 18W. 
RAINSHOWERS ARE POSSIBLE WITHIN 180 NM TO THE WEST AND NORTHWEST 
OF 30N14W 22N20W 20N39W. BROAD SURFACE ANTICYCLONIC WIND FLOW
COVERS THE ATLANTIC OCEAN TO THE NORTH OF 17N BETWEEN 40W AND 
80W. A 1030 MB HIGH PRESSURE CENTER IS NEAR 35N57W.

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

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MT