000
AGXX40 KNHC 201757
MIMATS

MARINE WEATHER DISCUSSION         
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
200 PM EDT MON APR 20 2009

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

GULF OF MEXICO...
A COLD FRONT EXTENDING FROM FL BIG BEND TO CENTRAL BAY OF 
CAMPECHE THIS AFTERNOON WILL MOVE SE OF AREA LATE TUE 
AFTERNOON. MODELS HAVE BACKED OFF ON STRENGTH OF NLY FLOW OVER 
THE SW GULF SO I BACKED OFF THIS MORNINGS TEXT PACKAGE TO 20-25 
KT AND ALSO MOVED UP TIMING OF WIND/SEAS DIMINISHING IN WAKE OF 
FRONT. MODELS ALSO FLUCTUATING SLIGHTLY ON TRACK OF HIGH PRES IN 
WAKE OF FRONT...BUT EXPECTING THE HIGH CENTER TO MOVE SLOWLY E 
ALONG 26N TUE AND WED THEN MOVE FASTER TO THE NE THU AND FRI. 
WINDS AROUND PERIPHERY OF THE ASSOCIATED RIDGE WILL INCREASE TO 
15-20 KT...EXCEPT 20-25 KT AROUND SUNSET FRI INTO SAT IN FL 
STRAITS.
 
SW N ATLC...
A LOW PRES CONTINUES NEAR 28N54W WITH A FRONTAL TROUGH EXTENDING 
SW TO HISPANIOLA. EXPECT THE TROUGH TO WASH OUT TONIGHT INTO 
EARLY TUE. SURFACE HIGH PRES JUST S OF BERMUDA HAS A RIDGE 
EXTENDING SW TO FL E COAST AT 27N ATTM...RIDGE WILL SHIFT S TO
ALONG 25N TUE...THEN SHIFT E OF THE BAHAMIAN CHAIN TUE NIGHT AND 
WED. SLY FLOW N OF RIDGE AT 15-20 KT ATTM...BUT EXPECTED TO TURN
SW WHILE INCREASING TO 20-25 KT EARLY TONIGHT JUST AHEAD OF 
FRONT MOVING OFF GA COAST LATE TONIGHT. FRONT WILL MOVE E AT 
PRETTY GOOD CLIP WED BUT BEGIN TO LOSE ITS PUSH LATE WED NIGHT 
ALONG PSN FROM BERMUDA TO SE BAHAMAS. REMNANTS OF FRONT EXPECTED 
TO MEANDER OVER THE SE WATERS THROUGH SAT. WIND AND SEAS STILL 
EXPECTED TO BE HIGHER TO E OF FRONT.

CARIBBEAN AND TROPICAL N ATLC...
A DISSIPATING COLD OVER THE NW CORNER OF THE TROPICAL ATLC ZONE 
WITH SEAS TO 7 FT IN N SWELL BEHIND FRONT. A WEAK COLD FRONT 
WILL ENTER THE YUCATAN CHANNEL LATE TONIGHT...PASSING EASTWARD 
THROUGH THE SOUTHERN CUBA COASTAL WATERS REACHING NEAR THE 
WINDWARD PASSAGE THU NIGHT WHERE IT SHOULD LOSE IDENTITY.
OTHERWISE...ATLC RIDGE N OF AREA WILL MAINTAIN FRESH ELY TRADES 
ACROSS THE REGION THROUGH THE PERIOD WITH LOCALLY ENHANCED WIND 
AND SEAS ALONG THE COAST OF COLOMBIA. 

ATLC...
.NONE.. 

CARIBBEAN...
.NONE.

GULF OF MEXICO...
.NONE.

FORECASTER NELSON. TROPICAL PREDICTION CENTER.