000
AGXX40 KNHC 291754
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
200 PM EDT TUE APR 29 2008

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

UPPER LEVELS...
BROAD LONGWAVE TROUGH DIGS SW FROM NRN FLORIDA TO BAY OF 
CAMPECHE SLOWLY MOVING E IN SUPPORT OF COLD FRONT DESCRIBED 
BELOW.  PLENTY OF TRPCL MOISTURE SWATH ADVECTED NE IN 115 KT 
JETSTREAM TRAPPED BETWEEN TROUGH AND DOWNSTREAM RIDGE WITH AXIS 
ALONG 67W.  RIDGE MAINTAIN DRY AIR MASS ELSEWHERE IN SW N ATLC 
AND CARIBBEAN WITH MODERATE TO STRONG SUBSIDENCE.  
SIMILARLY...RIDGE ALOFT W OF TROUGH KEEPS GULF OF MEXICO WITH 
FAIRLY DRY AIR MASS. 

SURFACE...
GULF OF MEXICO...WITH COLD FRONT E OF AREA SURFACE HIGH PRES 
BUILDS ACROSS ENTIRE BASIN WITH ONLY SHORT-LIVED MODERATE NE 
WINDS REMAINING THROUGH THIS AFTERNOON OVER NE PART OF GULF.  
OTHERWISE LIGHT TO MODERATE E-SE FLOW THROUGHOUT ENTIRE GULF
...EXCEPT WEAK COLD FRONT ENTERING NW GULF SAT MOVING E WITH 
LIGHT TO MODERATE NE WINDS N OF 25N SAT AND SUN. 

SW N ATLC...
COLD FRONT EXTENDING FROM 31N75W TO STRAITS OF FLORIDA CONTINUE 
MOVING E ACROSS BASIN WITH SCATTERED TSTMS MAINLY N OF 27N.  
OTHERWISE SW N ATLC REMAIN WITH DRY AIR MASS UNDER HIGH PRES 
RIDGE THAT DRIFTS E FORCED BY COLD FRONT.  GLOBAL MODELS BUILD 
NEW RIDGE BEHIND FRONT BUT AT 1020 MB LACK POWER TO SQUEEZE 
GRADIENT AND STRENGTHEN TRADES.  

CARIBBEAN AND TROPICAL ATLC...
TRADES START DIMINISHING WED AS HIGH PRES OVER SW N ATLC 
RETREATS E FORCED BY COLD FRONT.  NEW RIDGE BUILDS BEHIND FRONT 
LACKS POWER TO REINVIGORATE TRADES.  ONLY FLY IN THE OINTMENT IS 
AN UNEXPLAINABLE SURGE IN PAPAGAYO WINDS IN E PAC WHICH USUALLY 
ORIGINATE IN STRONG WRN CARIBBEAN WINDS.

WARNINGS...
ATLC...
NONE. 

CARIBBEAN...
NONE.

GULF OF MEXICO...
NONE.

.FORECASTER WALLY BARNES. TROPICAL PREDICTION CENTER.