000
AGXX40 KNHC 170741
MIMATS

MARINE WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
340 AM EDT SAT SEP 17 2011

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...
WEAK COLD FRONT IN NORTHEAST CORNER OF GULF BECOMING DIFFUSE AND 
EXPECTED TO DISSIPATE THIS AFTERNOON.  HIGH PRES BUILD ACROSS 
REGION TONIGHT AND SUN TIGHTENING PRES GRADIENT IN NE GULF.  N 
OF 27N E OF 88W WIND INCREASES TO A FRESH NE BREEZE MON AND 
TUE...BUT SEAS REMAIN BELOW 5 FT.

CARIBBEAN SEA AND TROPICAL N ATLC W OF 55W...
UPPER LEVEL CYCLONIC CIRCULATION NE OF VIRGIN ISLANDS ENHANCES 
CONVECTION JUST N OF WEAK SURFACE TROUGH FROM 17N59W TO 11N60W. 
BOTH FEATURES MOVING W IN TANDEM TODAY ALTHOUGH MODEL GUIDANCE 
INDICATES UPPER CYCLONE TO LIFT NE BY TONIGHT WHILE SURFACE 
TROUGH CONTINUES TO MOVE SLOWLY W.  LOSS OF UPPER LEVEL SUPPORT 
WEAKEN CONVECTIVE ACTIVITY ALONG TROUGH SUN AND MON.  HIGH PRES 
RIDGE OVER CENTRAL ATLC EXTEND SW BEHIND TROUGH THROUGH MON 
ALLOWING TRADES TO INCREASE ACROSS MOST OF TROPICAL N ATLC AND 
EASTERN CARIBBEAN ZONE.

SOUTHWEST N ATLC S OF 31N W OF 55W...
WEAK COLD FRONT EXPECTED TO MOVE OFF NE FLORIDA TODAY STALLS 
THEN DISSIPATES TONIGHT WITH RIDGE BUILDING IN ITS WAKE.  FRESH 
NE BREEZE IN NW PORTION SUN-MON WITH SEAS BUILDING TO 7 FT AS 
PRES GRADIENT TIGHTENS WITH STRENGTHENING RIDGE.  TROUGH FROM 
31N65W TO 22N77W DRIFT W TOWARD WESTERN CUBA AND FLORIDA COAST 
THROUGH MON. 

WARNINGS...

GULF OF MEXICO...
.NONE.

CARIBBEAN SEA AND TROPICAL N ATLC...
.NONE.

SW N ATLC...
.NONE.
          
FOR ADDITIONAL INFORMATION PLEASE VISIT
HTTP://WWW.HURRICANES.GOV/MARINE

$$
FORECASTER WALLY BARNES