000
AGXX40 KNHC 210800
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
300 AM EDT FRI AUG 21 2009

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

GULF OF MEXICO...
ATLC HIGH PRES RIDGE EXTEND INTO GULF WATERS JUST ALONG 28N 
MAINTAINING GENTLE BREEZE N OF AXIS AND GENTLE TO MODERATE E-SE 
BREEZE S OF 28N.  RIDGE AXIS FORCED S BY WEAK TROUGH 
APPROACHING ACROSS SE STATES.  AXIS REACH 26N FRI AND SAT AS 
TROUGH ENTERS N GULF WATERS.  LITTLE CHANGE IN STRENGTH OF WIND 
...BUT DOES CHANGE DIRECTION VEERING MORE TO THE N.  WEAK 
TROPICAL WAVE PRESENTLY CROSSING BAY OF CAMPECHE SHOULD MOVE W 
OF GULF LATE TONIGHT OR EARLY MORNING FRI.

CARIBBEAN...
WITH THE DISRUPTION OF EASTERLY FLOW BY HURCN BILL TRADES HAVE 
SIGNIFICANTLY WEAKENED TO A MODERATE BREEZE...MAYBE UP TO A 
FRESH BREEZE ALONG COAST OF COLOMBIA.   CLIMATOLOGICAL PATTERN 
RETURNS LATE TONIGHT OR SAT AS TROPICAL WAVE ENTERS ERN 
CARIBBEAN.  MODERATE TRADES BECOME FRESH WITH SEAS TO 8 FT BY 
LATE SAT AND EXTEND COVERAGE TO MOST OF ERN HALF OF BASIN.  WIND 
AND SEAS DIMINISH MON AS WAVE CONTINUES ITS PATH ACROSS CENTRAL 
AMERICA.

ATLANTIC W OF 55W...
HURCN BILL REMAINS AS MAIN FEATURE...NOT ONLY DUE TO ITS POWER 
AS CAT 3...BUT BY IT SIZE.  LARGE WIND FIELD EXTEND TROPICAL 
FORCE WINDS OVER 200 NM IN NE...SE AND NW QUADRANTS AND 120 NM 
IN SW QUADRANT.  SEAS 12 FT OR GREATER EXTEND OVER 420 NM NE OF 
CENTER AND OVER 300 NM ALL OTHER DIRECTIONS.  THE STEADY PATH OF 
BILL IS SENDING EXTREMELY LONG PERIOD SWELLS IN ALL DIRECTIONS 
...BUT MOST IMPORTANTLY...DIRECTLY AGAINST THE EASTERN SEABOARD.
WITH PERIODS OVER 15-17 SECONDS WAVES MIGHT SEEM INSIGNIFICANT 
IN DEEP WATERS TURN INTO DEADLY HEAVY SURF IN SHALLOW WATERS 
WITH IMPACT ON ANCHORED VESSELS AND SHORE ALIKE.  ALTHOUGH 
IMPACT WILL BE FELT MAINLY IN EXPOSED COAST N OF PAL 
BEACH...REFRACTED WAVES WILL AFFECT SRN FLORIDA TO A LESSER 
DEGREE.  NRN COAST OF GREATER ANTILLES AND ERN BAHAMAS ARE 
BEGINNING TO FEEL IMPACT OF LARGE BREAKERS.  

WARNINGS

ATLC...
HURRICANE WARNING N OF 25N E OF 72W...AMZ080.


CARIBBEAN...
.NONE. 

GULF OF MEXICO...
.NONE

$$
FORECASTER WALLY BARNES