000
AGXX40 KNHC 210710
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
200 AM EST SUN NOV 21 2010

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...
BUOY OBSERVATIONS SHOW LIGHT TO MODERATE E TO SE FLOW OVER MOST 
OF THE GULF...ALONG THE SOUTHERN PERIPHERY OF A 1027 MB SURFACE 
HIGH CENTERED OFF THE CAROLINA COAST. THE ONLY EXCEPTION TO THE 
LIGHT TO MODERATE FLOW IS 15 TO 20 KT WINDS THROUGH THE STRAITS 
OF FLORIDA AS NOTED BY SHIP OBSERVATIONS AND CMAN SITE IN THE 
FLORIDA KEYS. BUOYS OFF THE TEXAS COAST ARE ALSO SHOWING 15 TO 
20 KT SE RETURN FLOW...WHICH SHOULD PERSIST THROUGH EARLY TUE AS 
A SURFACE TROUGH DIGS THROUGH THE CENTRAL PLAINS INTO THE MID 
MISSISSIPPI VALLEY. THE SE FLOW OVER THE NW GULF WILL INCREASE 
AGAIN STARTING TUE NIGHT...AS DEEPER LOW PRES PUSHES THROUGH THE 
CENTRAL PLAINS. AN ASSOCIATED COLD FRONT WILL MOVE THROUGH THE 
SOUTHERN PLAINS AND APPROACH THE TEXAS COAST THU...AND MOVE INTO 
THE NW GULF WATERS LATE THU NIGHT FOLLOWED BY STRONG NORTHERLY 
WINDS. 

CARIBBEAN SEA AND TROPICAL N ATLC S OF 22N W OF 55W...A 
ASCAT...SHIP AND BUOY OBSERVATIONS SHOW A BROAD SWATH OF FRESH 
TRADES ACROSS THE ENTIRE CARIBBEAN. THE EXCEPTIONS ARE AREAS IN 
THE LEE OF THE GREATER ANTILLES ISLANDS AND OVER THE GULF OF 
HONDURAS. THE FRESH TRADES WILL CONTINUE ACROSS THE 
CARIBBEAN AND TROP N ATLC THROUGH MID WEEK AS HIGH PRES PERSISTS 
N OF THE AREA OVER THE WESTERN ATLC. THE STRONGEST WINDS WILL BE 
OVER THE N CENTRAL CARIBBEAN WHERE 20 TO 25 KT WINDS CAN BE 
EXPECTED STARTING SUN...INCLUDING THROUGH THE ATLC PASSAGES. THE 
PERSISTENTLY STRONG NE FLOW WILL GENERATE SEAS OF 10 TO 12 FT IN 
THE CENTRAL AND WESTERN CARIBBEAN BY MON...WITH 8 TO 10 SECOND 
PERIODS. WINDS WILL DIMINISH SLIGHTLY OVER THE WESTERN CARIBBEAN 
BY THU...AS THE HIGH PRES WEAKENS AND SHIFTS FURTHER EAST. 

SW N ATLC S OF 31N AND W OF 65W...
A DISSIPATING STATIONARY FRONT EXTENDS FROM 21N65W THROUGH THE 
TURKS AND CAICOS ISLANDS TO CENTRAL CUBA. BUOY AND SHIP 
OBSERVATIONS SHOW FRESH TRADES GENERALLY S OF 26N...ON THE 
SOUTHERN PERIPHERY OF 1027 MB SURFACE HIGH PRES CENTERED OFF THE 
CAROLINA COAST. SHIP OBSERVATIONS INDICATE WINDS OF 20 TO 25 KT 
ARE ACTIVE JUST NORTH OF PUERTO RICO AND DOMINICAN REPUBLIC. 
BUOYS SHOW SEAS ARE UP TO 10 FT IN NE SWELL S OF 26N AS WELL IN 
THE WATERS E OF THE BAHAMAS. THE FRESH TO STRONG TRADES WILL 
GRADUALLY DIMINISH IN INTENSITY AND AREAL COVERAGE THROUGH MID 
WEEK AS THE HIGH PRES WEAKENS AND SHIFTS SE. SEAS WILL SUBSIDE 
ACCORDINGLY AS WELL. SOUTHERLY RETURN FLOW WILL INCREASE OFF THE 
N FLORIDA COAST BY LATE THU...AHEAD OF A COLD FRONT PUSHING 
EASTWARD THROUGH THE DEEP SOUTH STATES. THE FRONT IS EXPECTED TO 
MOVE OFF THE N FLORIDA COAST BY LATE FRI...FOLLOWED BY STRONG NW 
WINDS. 

WARNINGS...

ATLC...
.NONE.

CARIBBEAN...
.NONE.

GULF OF MEXICO...
.NONE.

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

$$
FORECASTER CHRISTENSEN