000
AGXX40 KNHC 301805
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
210 PM EDT THU SEP 30 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...
BUILDING HIGH PRES OVER CENTRAL PLAINS ENTER NW GULF SAT WITH 
GENTLE TO MODERATE N-NE BREEZE ACROSS MOST OF BASIN.  DEVELOPING 
LOW PRES OVER NW CARIB MOVES N ACROSS CUBA AND STRAITS OF 
FLORIDA TIGHTENING PRES GRADIENT AND INCREASING NE BREEZE TO 
STRONG.  DRY AIR MASS ACROSS ENTIRE GULF LIMITS ANY SIGNIFICANT 
RAINFALL THROUGH PERIOD. 

CARIBBEAN SEA AND TROPICAL N ATLC...
TROUGH ACROSS WESTERN CARIBBEAN THROUGH FRI SHIFT N SAT AND 
SUN.  LOW PRES CENTER EXPECTED TO DEVELOP WITHIN BROAD CYCLONIC 
GYRE AROUND TROUGH THEN MOVE ACROSS CENTRAL CUBA INTO STRAITS OF 
FLORIDA AND SW N ATLC SUN.  ELSEWHERE IN CARIBBEAN...GENTLE TO 
MODERATE BREEZE PREVAIL ACROSS BASIN THROUGH FORECAST PERIOD.  
MODERATE TO FRESH TRADES PREVAIL OVER TROPICAL N ATLC WATERS 
THROUGH TONIGHT.  WEAK TROUGH AHEAD OF TROPICAL WAVE ENTERS 
TROPICAL ATLC LATE TONIGHT THROUGH FRI THEN ENTERS ERN 
CARIBBEAN SAT AND SUN.  TROPICAL WAVE FOLLOWS TROUGH AND MOVE 
INTO TROPICAL N ATLC SAT AND EASTERN CARIBBEAN MON.

SW N ATLC...
GALE WARNING REMAINS IN EFFECT FOR N OF 25N FROM 74W AND 78W. 
CONDITIONS DIMINISH BELOW GALE FORCE EARLY TONIGHT.  MOST MODEL 
GUIDANCE AGREE ON DEVELOPING LOW PRES OVER WESTERN CARIBBEAN AND 
CROSSING CENTRAL CUBA INTO STRAITS OF FLORIDA SUN OR MON BUT 
DIFFER WIDELY ON TRACK AND TIMING OF SOLUTION AFTER THAT.  
FORECAST TAKE LOW PRES CENTER N-NE ACROSS CENTRAL BAHAMAS AND SW 
N ATLC...BUT UNCERTAINTY IS VERY HIGH.  

WARNINGS...

SW N ATLC...
.AMZ080...GALE WARNING BETWEEN 74W AND 80W.

CARIBBEAN...
.NONE.

TROPICAL N ATLC...
.NONE.
  
GULF OF MEXICO...
.NONE.

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

$$
FORECASTER WALLY BARNES