000
AGXX40 KNHC 270605
MIMATS

MARINE WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL
210 AM EDT FRI APR 27 2012

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

GULF OF MEXICO...
AN E-W RIDGE EXTENDS FROM SW FL TO THE TX COASTAL BEND WITH SSE 
RETURN FLOW AT 15-20 OVER THE EXTREME W WATERS FROM 24N-27N W OF 
96W...AND E-SE 15-20 KT WINDS ARE OBSERVED ELSEWHERE W OF 89W. 
THE RIDGE AXIS WILL GRADUALLY SHIFT N AND EXTENDS E-W ACROSS THE 
NORTHERN COASTAL PLAINS SAT...THEN RE-ORIENTATE SE-SW FROM THE 
SC TO NE TX. ELY WINDS WILL PULSE AT 15-20 KT ACROSS THE SE GULF 
THROUGH SAT...THEN AN INVERTED TROUGH WILL DEVELOP IN THE 
VICINITY OF THE CAY SAL BANK LATE SAT NIGHT AND EARLY SUN. 
GUIDANCE DIFFERS ON STRENGTH OF THE ASSOCIATED LOW LEVEL WINDS 
BUT THE GFS AND ECM ARE FAIRLY CLOSE ON THE TRACK WHICH MOVES 
THE TROUGH TO ALONG 87W LATE MON NIGHT. WILL GO WITH A BLEND OF 
GEFS AND GFSP FOR THE STRENGTH...AND HOLD WINDS AT 15-20 KT. THE 
TROUGH WILL GRADUALLY DISSIPATE AS IT CONTINUES WNW ACROSS THE 
CENTRAL WATERS TUE.
 
SW N ATLC FROM 19N TO 31N W OF 55W...
A SURFACE HIGH IS JUST SE OF BERMUDA WITH A RIDGE EXTENDING SW 
TO CENTRAL FLORIDA. SLY WINDS ARE AT 15-20 KT N OF THE 
RIDGE...AND ELY WINDS ARE AT 15-20 KT S OF 22N. THE RIDGE WILL 
SHIFT N TO ALONG 31N SAT...THEN WEAKEN AS A TROUGH DEVELOPS W OF 
THE NW BAHAMAS THIS WEEKEND. UNCERTAINTY IN THE STRENGTH OF 
TROUGH...BUT EXPECT THE GRADIENT TO SUPPORT ELY 15-20 KT ACROSS 
THE ENTIRE AREA S OF 25N...EXCEPT NE 15-20 KT WINDS IN THE FL 
STRAITS W OF TROUGH AXIS. WINDS SHOULD DIMINISH FROM THE E ON 
MON AND TUE AS THE TROUGH MOVES W ACROSS THE SOUTHERN GULF OF 
MEXICO...BUT GENERALLY EXPECT E 15-20 KT THROUGHOUT THE BAHAMAS 
THROUGH TUE NIGHT.        

CARIBBEAN SEA AND TROPICAL ATLC S OF 19N W OF 55W...
A BROAD TROUGH CONTINUES ALONG 80W WITH THE ELY TRADES ENHANCED 
TO 15-20 KT EVERYWHERE E OF THE TROUGH. THE ELY WINDS WILL 
DIMINISH FROM THE E LATE IN THE WEEKEND AS ATLC HIGH PRES SHIFTS 
N...AND THE LOW LEVEL TROUGH MOVES ACROSS THE WESTERN CARIBBEAN 
AND FINALLY W OF THE AREA MON NIGHT.

NOTE... EFFECTIVE APR 3, 2012 AT 1800 UTC THE OFFSHORE WATERS 
FORECAST ZONES CHANGED FOR THE CARIBBEAN AND SW N ATLANTIC AND 
THE GULF OF MEXICO. ISSUANCE TIME FOR THE GULF OF MEXICO OFFSHORE
WATERS FORECASTS IS REFERENCED TO THE EASTERN TIME ZONE. FOR 
DETAILS SEE WWW.NHC.NOAA.GOV/ABOUTTAFBPROD.SHTML#OWF

GRIDDED MARINE OUTPUT IS AVAILABLE AT 
WWW.NHC.NOAA.GOV/TAFB/GRIDDED_MARINE (LOWER CASE).

GULF OF MEXICO...
.NONE.

CARIBBEAN SEA...
.NONE.

ATLANTIC...
.NONE.

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

$$
FORECASTER NELSON