000
AGXX40 KNHC 150813
MIMATS

MARINE WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
400 AM EDT SUN APR 15 2012

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

GULF OF MEXICO...
TIGHT GRADIENT BETWEEN HIGH PRES RIDGE CENTERED OFF SOUTH 
CAROLINA COAST AND APPROACHING COLD FRONT ACROSS SOUTHERN PLAINS 
PRODUCING STRONG TO NEAR GALE FORCE SE WINDS OVER WATERS W OF 
90W TODAY AND TONIGHT.  SEAS HAVE BEEN REPORTED AS HIGH AS 10 
FT.  COLD FRONT ENTER GULF WESTERN ZONES TUE BUT STALLS W OF 90W 
WED AND RETREATS OVER BAY OF CAMPECHE THEN INLAND LATE WED. 
WINDS START DIMINISHING WED AS FRONT RETREATS AND WEAKENING HIGH 
PRES DRIFTS OVER SW N ATLC.  

CARIBBEAN SEA...
HEALTHY HIGH PRES CENTER 1029 MB OFF SOUTH CAROLINA COAST DRIFT 
FURTHER S BEHIND STRONG COLD FRONT PRESENTLY FROM 22N61W TO 
17N68W.  STRONG TO NEAR GALE FORCE WINDS BEHIND FRONT ENTER 
CARIBBEAN THROUGH ATLC PASSAGES...ANEGADA...MONA AND WINDWARD 
SPREADING SW AND BUILDING SEAS TO 12 FT THROUGH MON.  SEVERAL  
GALE FORCE WIND GUSTS HAVE BEEN REPORTED ACROSS BOTH BASINS AND 
FUNNELING SEAS ACROSS PASSAGES MAY RESULT IN HIGHER SEAS... 
ADDITIONAL PRECAUTIONS SHOULD BE TAKEN WHEN CROSSING THESE.
WIND AND SEA CONDITIONS IMPROVE LATE TUE AND WED.  

SW NORTH ATLANTIC S OF 31N W OF 55W...
HIGH PRES 1029 MB OFF SOUTH CAROLINA POWERS COLD FRONT JUST SE 
OF BASIN AND BRINGS STRONG TO NEAR GALE FORCE WINDS AND SEAS AS 
HIGH AS 11 FT S OF 26N INTO SW N ATLC ZONE.  HIGH PRES SHIFT SE 
MON BUT WEAKEN RESULTING IN DIMINISHING WINDS ACROSS BASIN N OF 
24N TUE AND WED.  LINGERING N SWELLS DECAY BELOW 8 FT LATE WED 
OVER SOUTHERNMOST LATITUDES.  FRONTAL TROUGH...ASSOCIATED WITH  
DEVELOPING LOW PRES NE OF AREA MOVES ACROSS N WATERS E OF 65W 
LATE MON BRINGING SOME INCREASE IN WINDS AND SEAS THROUGH 
REMAINDER OF FORECAST PERIOD.

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 AND TROPICAL N ATLC...
.NONE.

.SW N ATLC...
.NONE.
    
FOR ADDITIONAL INFORMATION PLEASE VISIT
HTTP://WWW.HURRICANES.GOV/MARINE

$$
FORECASTER WALLY BARNES