High Seas Forecast
Issued by NWS

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403
FZNT01 KWBC 181549
HSFAT1

HIGH SEAS FORECAST FOR METAREA IV
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1630 UTC FRI AUG 18 2017

CCODE/1:31:04:01:00/AOW/NWS/CCODE
SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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.
ONLY YOU KNOW THE WEATHER AT YOUR POSITION. REPORT IT TO THE
NATIONAL WEATHER SERVICE. EMAIL US AT
VOSOPS@NOAA.GOV(LOWERCASE).

ATLANTIC ICEBERG ANALYSIS AND OUTLOOK PRODUCTS...COURTESY OF
THE U.S. COAST GUARD INTERNATIONAL ICE PATROL...CAN BE FOUND
ON THE OCEAN PREDICTION CENTER WEB PAGE AT
HTTP://WWW.OPC.NCEP.NOAA.GOV/ATL_TAB.SHTML(LOWERCASE).

SECURITE

NORTH ATLANTIC NORTH OF 31N TO 67N AND WEST OF 35W

SYNOPSIS VALID 1200 UTC AUG 18
24 HOUR FORECAST VALID 1200 UTC AUG 19
48 HOUR FORECAST VALID 1200 UTC AUG 20

.WARNINGS.

...GALE WARNING...
.POST-TROPICAL CYCLONE GERT 49N38W 1000 MB MOVING NE 15 KT WILL
TURN NW. WITHIN 240 NM OF LOW EXCEPT 180 NM W QUADRANT WINDS 25
TO 35 KT. SEAS 8 TO 16 FT. ELSEWHERE WITHIN 120 NM S OF A FRONT
FROM 43N38W TO 39N46W TO 36N53W WINDS 20 TO 30 KT. SEAS 9 TO 15
FT.
.24 HOUR FORECAST POST-TROPICAL CYCLONE GERT 52N40W 997 MB.
WITHIN 240 NM N AND 480 W QUADRANTS WINDS 25 TO 35 KT. SEAS 8 TO
14 FT.
.48 HOUR FORECAST POST-TROPICAL CYCLONE GERT E OF FORECAST AREA
NEAR 52N33W 998 MB. FROM 42N TO 58N BETWEEN 35W AND 46W WINDS 20
TO 30 KT. SEAS TO 12 FT.

...GALE WARNING...
.LOW 50N51W 995 MB NEAR STATIONARY WILL MOVE E 10 KT. WITHIN 180
NM NW SEMICIRCLE WINDS 25 TO 35 KT. SEAS 8 TO 14 FT. ELSEWHERE
WITHIN 300 NM N AND 480 NM S AND SW QUADRANTS WINDS 20 TO 30 KT.
SEAS 8 TO 13 FT.
.24 HOUR FORECAST LOW DISSIPATED WITH NEW LOW 50N39W 999 MB.
WITHIN 480 NM S AND 720 NM SE QUADRANTS WINDS 20 TO 30 KT. SEAS
8 TO 14 FT.
.48 HOUR FORECAST LOW AND CONDITIONS ABSORBED INTO POST-TROPICAL
CYCLONE GERT DESCRIBED ABOVE.

...GALE WARNING...
.FROM 62N TO 67N BETWEEN 50W AND 55W S TO SE WINDS 20 TO 30 KT.
SEAS TO 8 FT.
.24 HOUR FORECAST FROM 61N TO 65N BETWEEN 50W AND 54W S TO SE
WINDS 25 TO 35 KT. SEAS TO 11 FT.
.48 HOUR FORECAST FROM 60N TO 64N BETWEEN 49W AND 52W S TO SE
WINDS 20 TO 30 KT. SEAS TO 10 FT.

.SYNOPSIS AND FORECAST.

.24 HOUR FORECAST FROM 40N TO 45N BETWEEN 64W AND 71W WINDS TO
25 KT. SEAS TO 8 FT.
.48 HOUR FORECAST FROM 41N TO 50N BETWEEN 57W AND 63W WINDS 20
TO 30 KT. SEAS TO 9 FT.

.LOW 58N42W 1014 MB NEARLY STATIONARY. WITHIN 180 NM NE QUADRANT
WINDS 20 TO 30 KT. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST LOW DISSIPATED AND CONDTIONS DIMINISHED.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 44N TO 49N
BETWEEN 35W AND 38W.
.24 HOUR FORECAST DENSE FOG E OF AREA.

.HIGH 39N66W 1017 MB MOVING NE 15 KT.
.24 HOUR FORECAST HIGH 41N56W 1021 MB.
.48 HOUR FORECAST HIGH 45N48W 1025 MB.

.FORECASTER SIENKIEWICZ. OCEAN PREDICTION CENTER.

NATIONAL HURRICANE CENTER MIAMI FL

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

SYNOPSIS VALID 1200 UTC FRI AUG 18.
24 HOUR FORECAST VALID 1200 UTC SAT AUG 19.
48 HOUR FORECAST VALID 1200 UTC SUN AUG 20.

.WARNINGS.

...ATLC AND CARIBBEAN TROPICAL STORM WARNING...
.TROPICAL STORM HARVEY NEAR 13.1N 61.1W 1005 MB AT 1500 UTC AUG
18 MOVING W OR 270 DEG AT 18 KT. MAXIMUM SUSTAINED WINDS 35 KT
GUSTS 45 KT. TROPICAL STORM FORCE WINDS WITHIN 60 NM N SEMICIRCLE
AND 0 NM S SEMICIRCLE. SEAS 12 FT OR GREATER WITHIN 60 NM N
SEMICIRCLE AND 0 NM S SEMICIRCLE WITH SEAS TO 14 FT. ELSEWHERE
WITHIN AREA BOUNDED BY 14N56W TO 12N57W TO 12N61W TO 20N64W TO
20N62W TO 20N56W TO 14N56W...INCLUDING IN ATLANTIC EXPOSURES AND
PASSAGES AND ATLANTIC EXPOSURES...WINDS 20 TO 33 KT. SEAS 8 TO 12
FT.
.24 HOUR FORECAST TROPICAL STORM HARVEY NEAR 13.6N 67.3W.
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. TROPICAL STORM FORCE
WINDS WITHIN 60 NM N SEMICIRCLE AND 30 NM S SEMICIRCLE. SEAS 12
FT OR GREATER WITHIN 90 NM NE QUADRANT...30 NM SE QUADRANT...0 NM
SW QUADRANT AND 45 NM NW QUADRANT WITH SEAS TO 16 FT. ELSEWHERE
WITHIN AREA BOUNDED BY 14N64W TO 13N66W TO 16N70W TO 20N67W TO
21N63W TO 19N63W TO 14N64W...INCLUDING IN ATLANTIC PASSAGES...
WINDS 20 TO 33 KT. SEAS 8 TO 12 FT.
.48 HOUR FORECAST TROPICAL STORM HARVEY NEAR 14.3N 75.0W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE
WINDS WITHIN 70 NM N SEMICIRCLE AND 30 NM S SEMICIRCLE. SEAS 12
FT OR GREATER WITHIN 120 NM NE QUADRANT...75 NM SE QUADRANT...30
NM SW QUADRANT AND 60 NM NW QUADRANT WITH SEAS TO 19 FT.
ELSEWHERE WITHIN AREA BOUNDED BY 12N73W TO 13N75W TO 15N76W TO
17N76W TO 18N72W TO 16N71W TO 12N73W WINDS 20 TO 33 KT. SEAS 8 TO
12 FT.
.72 HOUR FORECAST TROPICAL STORM HARVEY NEAR 15.0N 82.0W.
MAXIMUM SUSTAINED WINDS 60 KT GUSTS 75 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM HARVEY NEAR 16.5N 87.5W.
MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT.
.120 HOUR FORECAST TROPICAL DEPRESSION HARVEY INLAND NEAR 18.5N
91.0W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 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 LOW PRES NEAR 17N50W 1010 MB. WITHIN AREA BOUNDED BY
15N46W TO 16N49W TO 19N55W TO 21N52W TO 21N49W TO 18N45W TO
15N46W E WINDS 20 TO 30 KT. SEAS 8 TO 10 FT.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
19N58W 1009 MB. WITHIN AREA BOUNDED BY 20N50W TO 17N51W TO
17N56W TO 19N60W TO 23N59W TO 23N52W TO 20N50W E WINDS 20 TO 30
KT. SEAS 8 TO 11 FT.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
21N66W 1008 MB. WITHIN AREA BOUNDED BY 20N59W TO 19N63W TO
22N69W TO 25N66W TO 25N62W TO 20N59W E TO SE WINDS 20 TO 25 KT.
SEAS 8 TO 10 FT.

.ATLC 06 HOUR FORECAST WITHIN AREA BOUNDED BY 14N35W TO 14N38W
TO 19N40W TO 20N39W TO 21N35W TO 14N35W WINDS 20 KT OR LESS.
SEAS 8 TO 9 FT IN MIXED NE AND SE SWELL.
.24 HOUR FORECAST WITHIN AREA BOUNDED BY 14N37W TO 15N42W TO
16N44W TO 19N44W TO 21N41W TO 19N37W TO 14N37W E WINDS 20 TO 25
KT. SEAS 8 TO 10 FT.
.48 HOUR FORECAST WITHIN AREA BOUNDED BY 17N44W TO 16N49W TO
19N54W TO 21N53W TO 22N51W TO 21N45W TO 17N44W E WINDS 20 TO 30
KT. SEAS 8 TO 11 FT.

.ATLC 09 HOUR FORECAST WITHIN AREA BOUNDED BY 21N73W TO 21N70.5W
TO 20N70.5W TO 20N73W TO 21N73W...INCLUDING APPROACH TO WINDWARD
PASSAGE...E WINDS 20 TO 25 KT. SEAS TO 8 FT.
.18 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST LITTLE CHANGE.
.33 HOUR FORECAST WITHIN AREA BOUNDED BY 21N74W TO 21N70.5W TO
20N70.5W TO 20N74W...INCLUDING APPROACH TO WINDWARD PASSAGE... NE
TO E WINDS 20 TO 25 KT. SEAS TO 8 FT.
.48 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

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

$$
.FORECASTER LEWITSKY. NATIONAL HURRICANE CENTER.



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