000
AXNT20 KNHC 280601
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL  
205 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 0515 UTC.

...THE ITCZ...

FROM SOUTHERN COASTAL SIERRA LEONE TO 3N20W...CROSSING THE
EQUATOR ALONG 26W...TO 1S31W...RETURNING TO THE EQUATOR ALONG 
50...IN EXTREME NORTHEASTERN COASTAL BRAZIL. WIDELY SCATTERED
STRONG RAINSHOWERS AND THUNDERSTORMS ARE TO THE SOUTH OF 5N 
BETWEEN 10W AND 20W. DISORGANIZED ISOLATED MODERATE RAINSHOWERS 
TO LOCALLY STRONG THUNDERSTORMS ARE ELSEWHERE TO THE SOUTH 
OF 6N BETWEEN 27W AND 51W.

...DISCUSSION...

THE GULF OF MEXICO...

A COLD FRONT PASSES THROUGH SOUTH CENTRAL LOUISIANA TO THE 
SOUTHWESTERN CORNER OF THE AREA...NEAR 19N97W ALONG THE MEXICO 
COAST. ALL THE SEVERE WEATHER IMAGINABLE HAS BEEN OCCURRING 
OVER LAND DURING THE LAST 24 HOURS...WITH TORNADOES AND HEAVY 
RAIN. NUMEROUS STRONG RAINSHOWERS ARE MOVING FROM EASTERN 
ALABAMA INTO THE NORTHERN HALF OF GEORGIA. BROAD SURFACE
LOW PRESSURE COVERS MEXICO...FROM NORTHWEST TO SOUTHEAST...
AND THEN EASTWARD FROM THE AREA WHERE THE COLD FRONT REACHES
MEXICO EASTWARD TOWARD HONDURAS. ISOLATED MODERATE RAINSHOWERS 
HAVE BEEN OBSERVED MOVING ACROSS THE YUCATAN PENINSULA TO THE 
SOUTH OF 20N TO THE EAST OF 90W.

THE CARIBBEAN SEA...

BROKEN MULTILAYERED CLOUDS AND ISOLATED MODERATE RAINSHOWERS ARE 
FROM 10N TO 15N BETWEEN 56W 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 70W.

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 26N53W. 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 1011 MB LOW 
PRESSURE CENTER IS NEAR 31N20W. ISOLATED MODERATE RAINSHOWERS 
ARE TO THE NORTH OF 30N BETWEEN 17W AND 23W. RAINSHOWERS ARE 
POSSIBLE WITHIN 120 TO 180 NM TO THE WEST AND NORTHWEST OF 
30N16W 24N20W 21N30W 21N36W. BROAD SURFACE ANTICYCLONIC WIND 
FLOW COVERS THE ATLANTIC OCEAN TO THE NORTH OF 17N BETWEEN 35W 
AND 80W. A 1032 MB HIGH PRESSURE CENTER IS NEAR 35N60W.

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

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MT