000
AGXX40 KNHC 201749
MIMATS

MARINE WEATHER DISCUSSION   
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
200 PM EDT THU MAY 20 2010

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

WEAK RIDGE ACROSS THE NORTHERN GULF OF MEXICO WILL STRENGTHEN 
SOME TONIGHT AND SLY WINDS WILL INCREASE OF THE NW GULF OF 
MEXICO TONIGHT. THE RIDGE ONCE AGAIN WEAKENS SAT WITH WINDS 
MOSTLY LIGHT ACROSS THE ENTIRE AREA. E WINDS MAY INCREASE TO 20 
KT IN THE STRAITS OF FLORIDA AS LOW PRES IS EXPECTED TO DEVELOP 
OVER THE BAHAMAS LATE FRI. LOWER PRES OVER THE ATLC COMBINED 
WITH HIGH PRES ALONG THE FLORIDA PANHANDLE WILL CONTINUE 20 KT E 
WINDS ACROSS THE STRAITS OF FLORIDA THROUGH SUN. LOW MOVES NE 
AND THE WINDS DECREASE MON AND TUE.

ATLC TROUGH HAS DEVELOPED OVER THE WESTERN BAHAMAS. WEAK LOW 
PRES IS FORECAST JUST E OF THE BAHAMAS FRI EVENING THIS COMBINED 
WITH THE RIDGE TO THE E WILL INCREASE WINDS TO 20-25 KT OVER THE 
E SEMICIRCLE OF THE LOW. THE CURRENT FORECAST CALLS FOR GALE 
CONDITIONS EXPECTED N OF 27N E OF 70W LATE SAT AND SUN HOWEVER
LATEST MODEL RUNS DOES NOT INDICATE GALE FORCE WINDS W OF 65W
BUT WILL KEEP POSSIBLE GALE IN THE NEXT FORECAST PACKAGE.
THE LOW INITINALLY MOVES NE THEN MOVES TO THE NW TUE.

WITH ATLC RIDGE WEAKENING AND LOW PRES DEVELOPING CARIBBEAN 
TRADES HAVE DECREASED TO 15-20 KT IN THE S CENTRAL CARIBBEAN 
THROUGH FRI. THE GRADIENT WILL WEAKEN FURTHER SAT AND WINDS WILL 
DECREASE TO LESS THAN 20 KT ACROSS THE ENTIRE CARIBBEAN SAT 
THROUGH TUE. A WEAK TROUGH MAY DEVELOP OVER THE SW CARIBBEAN
TONIGHT AND LINGER THROUGH TUE. 

WARNINGS...
ATLC...
.NONE.

CARIBBEAN...
.NONE.

GULF OF MEXICO...
.NONE.

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

$$
FORECASTER DGS