000
FZNT02 KNHC 210412
HSFAT2

HIGH SEAS FORECAST
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 
0430 UTC FRI AUG 21 2009

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS
AMENDED FOR ATLC FORECAST

SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE 
HEIGHT OF THE HIGHEST 1/3 OF THE WAVES. INDIVIDUAL WAVES MAY BE 
MORE THAN TWICE THE SIGNIFICANT WAVE HEIGHT.

PAN PAN

ATLANTIC BETWEEN 07N TO 31N W OF 35W INCLUDING CARIBBEAN SEA
AND GULF OF MEXICO

SYNOPSIS VALID 0000 UTC FRI AUG 21.
24 HOUR FORECAST VALID 0000 UTC SAT AUG 22.
48 HOUR FORECAST VALID 0000 UTC SUN AUG 23.

.WARNINGS.

...HURRICANE WARNING...
.HURRICANE BILL NEAR 24.9N 64.3W 943 MB AT 0300 UTC AUG 21
MOVING NW OR 310 DEG AT 16 KT. MAXIMUM SUSTAINED WINDS 110 KT
GUSTS 135 KT. TROPICAL STORM FORCE WINDS WITHIN 200 NM NW AND SE 
QUADRANTS...225 NM NE QUADRANT AND 120 NM SW QUADRANT. SEAS 12 
FT OR GREATER WITHIN 300 NM W SEMICIRCLE...420 NM NE QUADRANT 
AND 360 NM SE QUADRANT WITH SEAS TO 54 FT.
.24 HOUR FORECAST HURRICANE BILL NEAR 29.6N 67.9W. MAXIMUM
SUSTAINED WINDS 115 KT GUSTS 140 KT. LITTLE CHANGE IN RADIUS OF 
TROPICAL STORM FORCE WINDS. SEAS 12 FT OR GREATER WITHIN 420 NM 
E SEMICIRCLE...480 NM SW QUADRANT AND 240 NM NW QUADRANT WITH 
SEAS TO 60 FT. 
.48 HOUR FORECAST HURRICANE BILL NEAR 36.4N 68.6W. MAXIMUM
SUSTAINED WINDS 100 KT GUSTS 120 KT. TROPICAL STORM FORCE WINDS
WITHIN 225 NM E SEMICIRCLE...150 NM SW QUADRANT AND 180 NM NW 
QUADRANT. SEAS 12 FT OR GREATER OVER FORECAST WATERS N OF 29N 
BETWEEN 62W AND 69W.
.72 HOUR FORECAST HURRICANE BILL NEAR 44.3N 62.0W. MAXIMUM
SUSTAINED WINDS 80 KT GUSTS 100 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST EXTRATROPICAL LOW BILL NEAR 50.5N 43.0W.
MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT.
.120 HOUR FORECAST EXTRATROPICAL LOW BILL NEAR 55.0N 20.0W. 
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.

.SYNOPSIS AND FORECAST.

.ATLC EXCEPT AS NOTED IN WARNINGS ON HURRICANE BILL...WITHIN 510 
NM NE AND 450 NM SE QUADRANTS AND 420 NM W SEMICIRCLE WINDS 20 
TO 33 KT. SEAS 8 TO 12 FT. ELSEWHERE S OF 29N BETWEEN 65W AND 
73W WINDS LESS THAN 20 KT. SEAS 8 TO 12 FT IN E SWELL.
.24 HOUR FORECAST EXCEPT AS NOTED IN WARNINGS...OVER FORECAST 
WATERS WITHIN 510 NM NE AND 450 NM SE QUADRANTS AND 330 NM W 
SEMICIRCLE WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. ELSEWHERE FROM 
67W TO 77W WINDS LESS THAN 20 KT. SEAS 8 TO 12 FT IN E SWELL.
.48 HOUR FORECAST N OF 29N BETWEEN 63W AND 70W S TO SW WINDS 20 
KT. SEAS 9 TO 13 FT. ELSEWHERE N OF 27N W OF 59W WINDS LESS THAN 
20 KT. SEAS 8 TO 12 FT.

.ATLC ELSEWHERE FROM 12N TO 25N E OF 55W NE TO E WINDS TO 20 KT. 
SEAS TO 9 FT.
.24 HOUR FORECAST ELSEWHERE FROM 12N TO 25N W OF 45W AND E OF 
45W FROM 15N TO 26N NE TO E WINDS TO 20 KT. SEAS TO 9 FT.
.48 HOUR FORECAST FROM 14N TO 19N W OF 53W E WINDS 20 TO 25 KT. 
SEAS 8 TO 10 FT. ELSEWHERE FROM 12N TO 23N BETWEEN 50W AND 70W 
AND E OF 50W FROM 15N TO 26N E WINDS TO 20 KT. SEAS TO 9 FT.

.CARIBBEAN FROM 11N TO 13N BETWEEN 71W AND 77W NE TO E WINDS TO 
20 KT. SEAS TO 8 FT.
.24 HOUR FORECAST FROM 11N TO 15N E OF 77W NE TO E WINDS TO 20 
KT...EXCEPT TO 25 KT NEAR COAST OF COLOMBIA. SEAS TO 8 FT.
.48 HOUR FORECAST E OF 75W AND FROM 11N TO 15N BETWEEN 75W AND 
77W NE TO E WINDS 20 TO 25 KT. SEAS 8 TO 10 FT.

.REMAINDER OF AREA WINDS LESS THAN 20 KT. SEAS LESS THAN 8 FT.

$$
.FORECASTER SCHAUER CLARK. TROPICAL PREDICTION CENTER.