000
AGXX40 KNHC 100705
MIMATS

MARINE WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
300 AM EDT FRI OCT 10 2008

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

UPPER LEVELS...
DEEP LAYER CUT-OFF CYCLONE OVER GEORGIA HAS SHARP TROUGH DIG S 
TO WRN CUBA WITH ATTENDANT COLD FRONT ACROSS N FLORIDA ACROSS 
GULF OF MEXICO AND BAY OF CAMPECHE.  FRONT STALLS OVER SRN 
FLORIDA AND BECOMES STATIONARY...OR EVEN BACKS N...AS CYCLONE 
ALOFT SHIFTS NE PULLING SUPPORT OUT OF COLD FRONT.  BROAD UPPER 
ANTICYCLONE OVER SW GULF OF MEXICO DRIFT STEADILY W KEEPING NRN 
HALF OF GULF WITH FAIRLY DRY AIR MASS.  WEAK BUT STUBBORN UPPER 
LEVEL RIDGE OVER SW N ATLC REFUSES TO YIELD THE FIELD TO CUT-OFF 
CYCLONE AND KEEPS CONTROL OF DRY AIR MASS ON ERN HALF OF BASIN
WHILE COLD FRONT ATTRACTS TROPICAL MOISTURE FROM WRN CARIBBEAN 
AND KEEPS IT OVER WRN HALF WITH SCATTERED CONVECTION AFFECTING 
SRN FLORIDA AND NW BAHAMAS. 

SURFACE...
COLD FRONT MAINTAINS STEADY FRESH E BREEZE N OF 23N OVER SW N 
ATLC THROUGH FORECAST PERIOD BUT LACKS POWER TO TIGHTEN PRES 
GRADIENT IN CARIBBEAN UNTIL VERY LATE IN FORECAST PERIOD WHEN 
BROAD LOW PRES DEVELOPS OVER SW CARIBBEAN WATERS.  TILL THEN 
CARIBBEAN WINDS REMAIN LIGHT TO MODERATE WITH SLIGHT SEAS.

GULF OF MEXICO WINDS COME UNDER INFLUENCE OF SW N ATLC COLD 
FRONT WITH STRONG E-NE WINDS MAINLY N OF 23N E OF 90W...ALTHOUGH
SOME 20 KT WINDS SPREAD W TO AS FAR AS 94W LATE IN FORECAST 
PERIOD AS BROAD LOW PRES MOVES INTO NW CARIBBEAN AND TIGHTENS 
GRADIENT.      

WARNINGS...

ATLANTIC...
NONE.

CARIBBEAN...
NONE.

GULF OF MEXICO...
NONE.

FORECASTER WALLY BARNES. TROPICAL PREDICTION CENTER.