000
AGXX40 KNHC 271834
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
230 PM EDT TUE OCT 27 2009

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

GULF OF MEXICO COLD FRONT FROM THE MOUTH OF THE MISSISSIPPI TO  
THE BAY OF CAMPECHE NEAR 19N96W WILL RAPIDLY WEAKEN FROM THE 
FLORIDA PANHANDLE TO 26N90W TONIGHT THEN DISSIPATE WED. STRONG 
20-30 KT NLY WIND BEHIND THE FRONT EARLIER HAVE DECREASEE TO 15 
KT OR LESS. PRES GRADIENT TIGHTENS AS ATLC HIGH PRES RIDGES INTO 
THE E GULF AND LOWER PRES DEVELOPS OVER TEXAS. AS A RESULT
SLY WINDS INCREASE TO 20-25 KT OVER THE WESTERN GULF WED NIGHT 
THROUGH THU NIGHT. NEXT COLD FRONT MOVES OFF THE TEXAS COAST THU 
NIGHT AND WILL EXTEND FROM CENTRAL LOUISIANA TO TAMPICO MEXICO 
FRI AFTERNOON THEN WEAKEN FROM THE FLORIDA PANHANDLE TO THE BAY 
OF CAMPECHE NEAR 19N95W SAT AND DISSIPATE SUN. NLY WINDS BRIEFLY 
INCREASE TO 20-25 KT BEHIND THE FRONT ON FRI. HIGH PRES BUILDS N 
OF THE AREA WILL SUPPORT A TIGHT ENOUGH GRADIENT FOR 15-20 KT NE 
WINDS OVER THE NE GULF SUN.

ATLC HIGH PRES RIDGE IS STRENGTHENING ALONG 30/31N. THE RIDGE 
WEAKENS AND MOVES S AS A RATHER STRONG COLD FRONT MOVES TO THE N 
OF THE AREA WED NIGHT. GFS INDICATES SWATH OF NLY WINDS NEAR 20 
KT THU THEN INCREASING TO NE 20-25 KT FRI AND SEAS BUILDING TO 
12 FT IN THE NE PORTION OF THE AREA. THESE WINDS PERSIST INTO 
SAT AND WAVEWATCH BRINGS NE SWELL OF 8-12 FT INTO A LARGE 
PORTION OF THE AREA. THE WINDS DECREASE AND SEAS SLOWLY SUBSIDE
SUN. A WEAK COLD FRONT MOVES OFF THE SE U.S. COAST LATE SAT AND 
EXTENDS FROM 31N76W TO 28N80W SUN WITH WEAK WINDS BOTH AHEAD OF 
AND BEHIND IT.

CARIBBEAN TRADES IN THE 20-25 KT RANGE CONTINUE IN THE CENTRAL 
CARIBBEAN S OF 18N BETWEEN 66W AND 81W WITH A TIGHT PRES 
GRADIENT BETWEEN ATLC HIGH PRES TO THE N AND LOW PRES OVER NRN S 
AMERICA. THESE WINDS ARE EXPECTED TO PERSIST THROUGH TONIGHT 
THEN DECREASE TO 15-20 KT WED THEN BELOW 20 KT THU THROUGH SUN.
HOWEVER ELY WINDS 20 KT INCREASE N OF 15N TO S OF HISPANIOLA 
AND PUERTO RICO WHERE THE PRES GRADIENT WILL REMAIN TIGHT 
THROUGH THU. WINDS WILL BE LESS THAN 20 KT ACROSS THE ENTIRE 
AREA FRI THROUGH SUN. MEANWHILE A TROPICAL WAVE NEAR 59W WILL 
CONTINUE TO PROPAGATE TO THE W ENTERING THE E CARIBBEAN BY 
TONIGHT. THE WAVE SHOULD WEAKEN AS IT MOVES INTO THE CARIBBEAN 
WHEN IT ENCOUNTERS INCREASING WLY SHEAR.

WARNINGS...

ATLC...
.NONE.

CARIBBEAN...
.NONE.

GULF OF MEXICO...
.NONE.

$$
FORECASTER JL/DGS