000
AGXX40 KNHC 111829
MIMATS

MARINE WEATHER DISCUSSION...UPDATED
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
245 PM EDT MON MAY 11 2010

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

GULF OF MEXICO...
THE COMBINATION OF HIGH PRES ACROSS THE MIDDLE AND EASTERN GULF 
AND STRONG LOW PRES OVER THE SOUTHERN PLAINS IS PRODUCING A 
TIGHT PRES GRADIENT OVER THE GULF WATERS RESULTING IN INCREASING 
WINDS AND SEAS. EXPECT SELY WINDS IN THE 20 TO 25 KT RANGE 
ACROSS MUCH OF THE GULF THROUGH FRI WITH BUILDING SEAS TO AROUND 
9 FT. THESE CONDITIONS WILL SUBSIDE ALL SECTIONS EXCEPT THE FAR 
SE PORTION THROUGH SAT AS A NEW HIGH CENTER SETTLES IN OVER THE 
FAR NE GULF. THE YUCATAN DIURNAL SEABREEZE WILL CONTINUE TO 
FLARE TO 20-25 KT WITHIN 90-120 NM OF THE COAST DURING LATE 
AFTERNOON AND EARLY NIGHT THROUGH THE FORECAST PERIOD. THE MOST 
RECENT ASCAT PASS PROVIDED OBSERVATIONS OF 15 TO 20 KT OVER THE 
SW GULF.  

SW N ATLANTIC S OF 31N W OF 55W...
A COLD FRONT EXTENDING FROM 27N65W TO 23N75W WILL MOVE E OF AREA 
TONIGHT AS A LARGE AREA OF HIGH PRES BUILDS SE ACROSS THE 
REGION. AS A RESULT...THE PRES GRADIENT WILL TIGHTEN ALLOWING 
FOR WINDS TO INCREASE AND SEAS TO BUILD PRIMARILY OVER THE 
SOUTHERN WATERS THROUGH SAT. AN ASCAT PASS FROM 1342 UTC SHOWED 
N-NE 20-25 KT WINDS BEHIND THE FRONT WHILE AN EARLIER WINDSAT 
PASS INDICATED NE-E WINDS OF 20 KT OVER THE WESTERN PORTION OF 
THE ZONE. MARINE PLATFORM 41049 LOCATED NEAR 27N63W IS REPORTING 
COMBINED SEAS OF 8 FT IN THE WAKE OF THE FRONT. THE FORECAST 
CALLS FOR NE TO E WINDS IN THE 20 TO 25 KT RANGE OVER THE 
SOUTHERN WATERS...INCLUDING ALSO THE STRAITS OF FLORIDA 
BEGINNING TONIGHT...WITH SEAS BUILDING 6-9 FT E OF THE BAHAMAS. 

CARIBBEAN SEA AND TROPICAL N ATLC...
HIGH PRES WILL BUILD SE ACROSS THE SW N ATLC DURING THE FORECAST 
PERIOD TIGHTENING THE PRES GRADIENT ACROSS THE CARIBBEAN SEA AND 
THE NORTHERN PORTION OF THE TROPICAL N ATLC. THIS WILL ALLOW FOR 
TRADES TO INCREASE ACROSS MUCH OF THE REGION THROUGH FRI. THE 
STRONGEST WINDS AND THE LARGEST SEAS WILL OCCUR NEAR THE COAST 
OF COLOMBIA. AN ASCAT PASS FROM AROUND 1520 UTC IS ALREADY 
SHOWING NE-E WINDS 15 TO 20 KT WITH SOME 25 KT WIND BARBS OVER 
THE NW CARIBBEAN BETWEEN CUBA AND THE CAYMAN ISLANDS. A MUCH 
EARLIER WINDSAT PASS INDICATED SIMILAR WIND DIRECTION AND SPEED. 
ALSO EXPECT NE TO E WINDS OF 25 TO 30 KT OFF THE COAST OF 
COLOMBIA WITH BUILDING SEAS UP TO 13 FT. ELY WINDS OF 20-25 KT 
SHOULD COVER ALL BUT THE FAR EASTERN CARIBBEAN THROUGH FRI. E OF 
ABOUT 65W...E WINDS WILL BE IN THE 15-20 KT RANGE.

GFS SUGGESTS THAT SEVERAL LOW AMPLITUDE TROPICAL WAVES WILL MOVE 
ACROSS S PORTIONS OF THE TROPICAL ATLC OVER THE NEXT FEW DAYS. 
ENHANCED MOISTURE WITH SHOWERS AND TSTMS ARE EXPECTED WITH AND 
JUST AHEAD OF THESE WAVES. ONE OF THEM IS CURRENTLY APPROACHING 
THE FAR SE PART OF THE TROPICAL N ATLC WITH ISOLATED TO 
SCATTERED SHOWERS.

WARNINGS...
ATLC...
.NONE.

CARIBBEAN...
.NONE.

GULF OF MEXICO...
.NONE.

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

$$
FORECASTER GR