000
AGXX40 KNHC 300645
MIMATS

MARINE WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL
245 AM EDT SAT APR 30 2011

MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA 
AND TROPICAL N ATLC...AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W.

GULF OF MEXICO...
SOUTHERN EXTENT OF COLD FRONT S OF FLORIDA HAS LARGELY DISSIPATED
AS E TO SE RETURN FLOW BECOMES ESTABLISHED ACROSS THE ENTIRE GULF
OF MEXICO. SCATTEROMETER DATA SHOWS LIGHT TO MODERATE E WINDS IN 
THE EASTERN HALF OF THE GULF...AND SURFACE OBS INDICATE MODERATE 
TO FRESH E-SE WINDS IN THE WESTERN GULF. SEAS ARE GENERALLY 3-5 
FT ACROSS THE GULF. EXPECT VERY LITTLE CHANGE THIS WEEKEND. HIGH 
PRES WILL SLOWLY SHIFT E ALONG 30N ALLOWING PROLONGED PERIOD OF 
E-SE WINDS TO PREVAIL OVER THE REGION WITH SEAS BUILDING TO 7 FT 
IN THE NW GULF. LOW PRES TROUGH ASSOCIATED WITH A DEVELOPING COLD
FRONT OVER TEXAS WILL INTENSIFY SUN NIGHT AND MON...INCREASING 
THE PRES GRADIENT W OF 90W. A SLOW MOVING COLD FRONT WILL REACH 
THE TEXAS COAST MON...THEN EXTEND FROM LOUISIANA TO NEAR TAMPICO 
MEXICO MON NIGHT...AND FROM THE FLORIDA BIG BEND TO THE BAY OF 
CAMPECHE TUE. N-NE WINDS INCREASE TO 20-25 KT NW OF THE FRONT.

SW N ATLC...
WEAKENING COLD FRONT EXTENDS FROM 31N73W TO MIAMI FLORIDA. SAT 
IMAGERY SHOWS MOST OF THE ACTIVE CONVECTION E OF THE SOUTHERN 
PART OF THE FRONT IN THE NORTHERN BAHAMAS BUT ISOLATED SHOWERS 
ELSEWHERE ALONG THE FRONTAL BOUNDARY. SCATTEROMETER AND SURFACE 
OBS INDICATE A SHARP DECREASE IN WIND SPEED NEAR THE FRONT OVER 
THE PAST 12 HOURS...AN INDICATION THE FRONT IS RAPIDLY LOSING 
ITS UPPER LEVEL SUPPORT S OF 30N. THE FRONT WILL CONTINUE TO 
WEAKEN TODAY. HIGH PRES WILL BUILD E ALONG 30N MON THROUGH TUE 
AND ELY WINDS INCREASE TO 20 KT OVER THE SE PORTION OF THE AREA. 
ANOTHER COLD FRONT WILL APPROACH THE SE U.S. COAST WED AFTERNOON 
WITH SW WINDS INCREASING TO 15-20 KT IN NW PORTION OF THE AREA.

CARIBBEAN AND TROPICAL N ATLC...
HIGH PRES SHIFTING NE OF THE AREA AND LOWER PRES ASSOCIATED WITH 
THE WEAKENING COLD FRONT PASSING N OF THE CARIBBEAN IS ACTING TO 
DIMINISH TRADE WINDS ACROSS THE AREA. SEAS ARE GENERALLY 5-7 FT 
IN THE E CARIBBEAN...3-5 FT IN THE W CARIBBEAN...AND 6-7 FT IN 
THE TROPICAL N ATLC. VERY LITTLE CHANGE EXPECTED THIS WEEKEND. 
HIGH PRES BUILDING N OF THE AREA WILL CREATE 20 KT WINDS IN THE 
ATLC PASSAGES AND NEAR THE COAST OF COLOMBIA SUN NIGHT THROUGH 
TUE WHILE ELY WINDS WILL INCREASE TO 20 KT E OF 75W TUE AND WED. 

WARNINGS..

ATLC...
.NONE.

CARIBBEAN...
.NONE.

GULF OF MEXICO...
.NONE.

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

$$
FORECASTER MUNDELL