000
AGXX40 KNHC 301824
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
230 PM EDT WED APR 30 2008

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

UPPER LEVEL LONGWAVE TROUGH FROM SW N ATLC DIGS ACROSS S FLORIDA 
INTO SRN GULF OF MEXICO WITH VERY DRY AIR MASS ALONG AND W OF 
ITS AXIS.  WIND FLOW LOSING ITS CURVATURE AS TROUGH TURNS NE 
WITH ZONAL FLOW 20N-30N.  SWATH OF TRPCL MOISTURE RUNS ALONG SE 
EDGE OF TROUGH FROM YUCATAN THROUGH CENTRAL CUBA TO 30N65W.  
NARROW MID-UPPER LEVEL RIDGE CENTERED OVER VENEZUELA HAS TILTED 
AXIS JUST E OF 65W ACCELERATING JET CORE TO 100 KT.  VERY DRY 
AIR MASS UNDER RIDGE COVERAGE.  MORE TRPCL MOISTURE BEGINNING TO 
SEEP INTO SWRN CARIBBEAN FROM E PAC ITCZ RIDING ON RIDGE WRN 
PERIPHERY.  UPPER DIVERGENT FLOW JUST W OF PANAMA ENHANCING DEEP 
CONVECTION RIGHT AT POINT OF LOW LEVEL CONVERGENCE.

SW N ATLC HIGH PRES CENTER FORCED E BY COLD FRONT RELAXING 
GRADIENT ACROSS BASIN AND CARIBBEAN SEA TOO.  TRADES DIMINISH 
ACROSS REGION UNTIL NEXT RIDGE ESTABLISHES ITSELF ONCE FRONT 
BECOMES DIFFUSE...MAYBE BEYOND FORECAST PERIOD.  NWW3 MAINTAINS 
LINGERING SWELLS MAINLY E OF 73W IN SW N ATLC NEXT 36 HRS.  
FORECAST AGREES WITH IT.

HIGH PRES RIDGE DOMINATES ENTIRE GULF OF MEXICO BASIN WITH E-SE 
FLOW STRENGTHENING TONIGHT AS NEW COLD FRONT CROSSES SE STATES 
BARELY SCRATCHING GULF N OF 27N.  SE FLOW INCREASES TONIGHT THEN 
SPREADS EWD ACROSS GULF.   

WARNINGS...
ATLC...
NONE. 

CARIBBEAN...
NONE.

GULF OF MEXICO...
NONE.

.FORECASTER WALLY BARNES. TROPICAL PREDICTION CENTER.