000
FZNT02 KNHC 310442 AAA
HSFAT2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
0430 UTC FRI JUL 31 2020

UPDATE TO UPGRADE TO HURRICANE ISAIAS

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS

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.

SECURITE

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

SYNOPSIS VALID 0000 UTC FRI JUL 31.
24 HOUR FORECAST VALID 0000 UTC SAT AUG  1.
48 HOUR FORECAST VALID 0000 UTC SUN AUG  2.

.WARNINGS.

...ATLC HURRICANE WARNING...
.HURRICANE ISAIAS NEAR 20.4N 72.2W 999 MB AT 0400 UTC JUL 31 
MOVING NW OR 305 DEG AT 16 KT. MAXIMUM SUSTAINED WINDS 70 KT 
GUSTS 85 KT. HURRICANE FORCE WINDS WITHIN 25 NM NE QUADRANT AND 
0 NM ELSEWHERE. TROPICAL STORM FORCE WINDS WITHIN 210 NM NE 
QUADRANT...120 NM SE QUADRANT...30 NM SW QUADRANT...AND 180 NM 
NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 300 NM NE 
QUADRANT...240 NM SE QUADRANT...0 NM SW QUADRANT...AND 310 NM NW 
QUADRANT WITH SEAS TO 24 FT. WITHIN 40 NM OF CENTER WINDS 55 TO 
75 KT. SEAS 20 TO 24 FT. ELSEWHERE WITHIN 20N70W TO 20N74W TO 
22N74W TO 23N72W TO 22N70W TO 20N70W...INCLUDING THE WINDWARD 
PASSAGE...WINDS 34 TO 50 KT. SEAS 14 TO 18 FT. ELSEWHERE WITHIN 
20N66W TO 20N73W TO 23N78W TO 25N73W TO 25N70W TO 
20N66W...INCLUDING THE WINDWARD PASSAGE...WINDS 20 TO 33 KT. 
SEAS 10 TO 12 FT. REMAINDER OF AREA WITHIN 19N64W TO 18N68W TO 
24N69W TO 24N76W TO 29N68W TO 19N64W WINDS 20 KT OR LESS. SEAS 8 
TO 11 FT IN E TO SE SWELL.
.24 HOUR FORECAST HURRICANE ISAIAS NEAR 23.5N 76.1W. MAXIMUM 
SUSTAINED WINDS 75 KT GUSTS 90 KT. HURRICANE FORCE WINDS WITHIN 
20 NM NE...15 NM SE...10 NM SW...AND 20 NM NW QUADRANTS. 
TROPICAL STORM FORCE WINDS WITHIN 160 NM NE QUADRANT...100 NM SE 
QUADRANT...40 NM SW QUADRANT...AND 140 NM NW QUADRANT. SEAS 12 
FT OR GREATER WITHIN 270 NM NE SEMICIRCLE WITH SEAS TO 28 FT. 
WITHIN 40 NM OF CENTER WINDS 60 TO 75 KT. SEAS 20 TO 28 FT. 
WITHIN 23N75W TO 23N78W TO 25N78W TO 26N76W TO 24N75W TO 23N75W 
E WINDS 45 TO 60 KT. SEAS 8 TO 23 FT. ELSEWHERE WITHIN 22N71W TO 
23N74W TO 23N78W TO 26N79W TO 27N74W TO 22N71W E TO SE WINDS 20 
TO 33 KT. SEAS 8 TO 17 FT. REMAINDER OF AREA WITHIN 22N69W TO 
21N76W TO 31N79W TO 31N73W TO 22N69W WINDS 20 KT OR LESS. SEAS 8 
TO 11 FT IN E TO SE SWELL.
.36 HOUR FORECAST HURRICANE ISAIAS NEAR 25.2N 77.8W. MAXIMUM 
SUSTAINED WINDS 75 KT GUSTS 90 KT.
.48 HOUR FORECAST HURRICANE ISAIAS NEAR 26.7N 79.0W. MAXIMUM 
SUSTAINED WINDS 70 KT GUSTS 85 KT. HURRICANE FORCE WINDS WITHIN 
20 NM NE...0 NM SE...0 NM SW...20 NM NW QUADRANTS. TROPICAL 
STORM FORCE WINDS WITHIN 90 NM NW AND SE QUADRANTS...110 NM NE 
QUADRANT AND 50 NM SW QUADRANT. SEAS 12 FT OR GREATER WITHIN 240 
NM NE AND 180 NM SW SEMICIRCLES WITH SEAS TO 25 FT. WITHIN 40 NM 
OF CENTER WINDS 60 TO 70 KT. SEAS 20 TO 25 FT. ELSEWHERE WITHIN 
26N78W TO 26N80W TO 28N80W TO 28N79W TO 27N78W TO 26N78W E TO SE 
WINDS 35 TO 60 KT. SEAS 12 TO 22 FT. ELSEWHERE WITHIN 27N76W TO 
25N78W TO 26N80W TO 28N80W TO 30N79W TO 27N76W WINDS 20 TO 33 
KT. SEAS 10 TO 18 FT. REMAINDER OF AREA WITHIN 27N75W TO 25N80W 
TO 28N80W TO 31N80W TO 30N76W TO 27N75W WINDS 20 KT OR LESS. 
SEAS 8 TO 11 FT IN MIXED SWELL.
.72 HOUR FORECAST HURRICANE ISAIAS NEAR 30.0N 79.5W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT. EXTENDED OUTLOOK...USE FOR 
GUIDANCE ONLY...ERRORS MAY BE LARGE. 
.96 HOUR FORECAST HURRICANE ISAIAS NEAR 34.6N 76.8W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT. .120 HOUR FORECAST TROPICAL 
STORM ISAIAS NEAR 42.0N 69.0W. MAXIMUM SUSTAINED WINDS 60 KT 
GUSTS 75 KT.

FORECAST WINDS IN AND NEAR ACTIVE TROPICAL CYCLONES SHOULD BE
USED WITH CAUTION DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE
AND INTENSITY.

.SYNOPSIS AND FORECAST.

.ATLC WITHIN 07N35W TO 07N38W TO 08N38W TO 09N37W TO 10N35W TO
07N35W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN SE TO S SWELL.
.12 HOUR FORECAST NONE. WINDS 20 KT OR LESS. SEAS LESS THAN 8 
FT.

.CARIBBEAN IN ASSOCIATION WITH TROPICAL STORM ISAIAS...SE WINDS 
20 TO 25 KT. SEAS 8 TO 11 FT IN SE SWELL. WITHIN 19N78W TO 19N79W
TO 21N79W TO 20N77W TO 19N78W NE WINDS 20 TO 25 KT. SEAS LESS 
THAN 8 FT. ELSEWHERE WITHIN 12N69W TO 13N73W TO 17N76W TO 17N71W 
TO 18N66W TO 12N69W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN SE 
SWELL.
.24 HOUR FORECAST WITHIN 13N68W TO 12N69W TO 13N69W TO 14N70W TO
15N69W TO 13N68W E WINDS 20 TO 25 KT. SEAS TO 8 FT. 
.36 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
LESS THAN 8 FT.

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

$$
.FORECASTER STRIPLING. NATIONAL HURRICANE CENTER.