000
AGXX40 KNHC 271857
MIMATS

MARINE WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
200 PM EST SUN DEC 27 2009

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

GULF OF MEXICO...
WEAK TROUGH 27N92W TO 20N93W BRINGS FRESH NE BREEZE ON W SIDE N 
OF 23N.  WIND INCREASE AS PRES GRADIENT TIGHTENS WITH TEXAS 
RIDGE EASTWARD SHIFT.  TROUGH DRIFT NE-E TONIGHT THROUGH MON 
REACHING 26N86W TO 21N88W EARLY MON...THEN DISSIPATE MON NIGHT.  
HIGH PRES HOLDS IN PLACE OVER GULF INTO TUE SHIFTING E AND 
WEAKENING AS SECOND TROUGH DEVELOPS JUST OFF COAST OF NE MEXICO. 
SECOND TROUGH SHIFT N-NE TO JUST OFF TEXAS COAST LATE TUE.  
MODEL GUIDANCE DEVELOPS WEAK LOW PRES CENTER NEAR 27N95W TUE 
NIGHT WITH TROUGH EXTENDING TO 22N96W.  FEATURES MOVE E ACROSS 
GULF WATERS WITH LOW PRES CENTER NEAR 29N86W WITH TRAILING 
TROUGH TO 21N90W WED AND OUT OF BASIN EARLY FRI. 

CARIBBEAN AND TROPICAL N ATLC W OF 55W...
WEAK FRONTAL TROUGH OVER NW CARIBBEAN FROM 21N86W TO 16N85W 
DISSIPATES TONIGHT.  FLAT PRES GRADIENT REMAINS OVER MOST OF 
CARIBBEAN WITH LIGHT TO MODERATE TRADES...EXCEPT ALONG COAST OF 
COLOMBIA WHERE 20-25 KT NE-E WINDS CONTINUE.  PATTERN PERSIST 
THROUGH MON.  PRES GRADIENT TIGHTENS MON NIGHT AS HIGH PRES 
BUILDS DOWN AND TRADES INCREASE A NOTCH THROUGH THU.  IN 
TROPICAL N ATLC...WEAKENING STATIONARY FRONT EXTENDS FROM 20N55W 
TO 20N65W WITH FRESH TO STRONG NE-E BREEZE CONTINUING N OF 20N.  
WINDS PERSIST THROUGH MON WITH FRONT DISSIPATING MON NIGHT.  
LARGE LONG PERIOD NORTHERLY SWELL CONTINUE TO SPREAD THROUGH 
TROPICAL N ATLC THROUGH FCST PERIOD AND SEEPING THROUGH ATLC 
PASSAGES INTO E CARIBBEAN THROUGH WED...EVENTUALLY DECAYING TO 
LESS THAN 8 FT FRI.
 
SW N ATLC S OF 31N W OF 55W...
COLD FRONT OFF FLORIDA COAST EXTEND FROM 31N71W TO 25N74W WITH 
MODERATE TO STRONG SW BREEZE E OF FRONT. FRONT REACH FROM 31N65W 
TO 20N73W LATE MON AND EXITS THE AREA TUE.  HIGH PRES BUILDS 
ACROSS EASTERN SEABOARD WED UNTIL LOW PRES CENTER 1014 MB 
CROSSES N FLORIDA INTO EXTREME NW PART OF BASIN THU WITH 
ASSOCIATED S-SW WINDS REACHING NEAR GALE FORCE JUST E OF CENTER. 
LOW PRES QUICKLY MOVES NE AWAY FROM SW N ATLC BUT FOLLOWING HIGH 
PRES 1030 MB FORCES VERY STRONG NORTHERLIES ACROSS ENTIRE BASIN 
FRI. 
 
WARNINGS...

ATLC...
.NONE.

CARIBBEAN...
.NONE.

GULF OF MEXICO...
.NONE.

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

$$
FORECASTER WALLY BARNES