High Seas Forecast
Issued by NWS

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000
FZNT01 KWBC 180359
HSFAT1

HIGH SEAS FORECAST FOR METAREA IV
NWS OCEAN PREDICTION CENTER WASHINGTON DC
0430 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC AUG 18
24 HOUR FORECAST VALID 0000 UTC AUG 19
48 HOUR FORECAST VALID 0000 UTC AUG 20

.WARNINGS.

...GALE WARNING...
.POST-TROPICAL CYCLONE GERT 46N44W 992 MB MOVING NE 20 KT.
WITHIN 240 NM S AND E SEMICIRCLES WINDS 25 TO 40 KT. SEAS 10 TO
20 FT. ELSEWHERE WITHIN 300 NM OF CENTER...AND 300 NM E OF A
FRONT FROM 42N46W TO 35N55W WINDS 20 TO 30 KT. SEAS 8 TO 18
FT...HIGHEST SW OF THE LOW CENTER.
.24 HOUR FORECAST POST-TROPICAL CYCLONE GERT 53N39W 987 MB.
WITHIN 240 NM N AND E SEMICIRCLES...FROM 42N TO 46N BETWEEN 40W
AND 50W...AND FROM 46N TO 50N BETWEEN 50W AND 54W WINDS 25 TO 40
KT. SEAS 10 TO 18 FT. ELSEWHERE FROM 38N TO 57N BETWEEN 35W AND
57W WINDS 20 TO 30 KT. SEAS TO 12 FT.
.48 HOUR FORECAST POST-TROPICAL CYCLONE GERT 50N35W 997 MB.
WITHIN 240 NM SW QUADRANT WINDS 25 TO 40 KT. SEAS 10 TO 18 FT.
ELSEWHERE FROM 45N TO 57N BETWEEN 35W AND 45W WINDS 20 TO 30 KT.
SEAS TO 12 FT.

...GALE WARNING...
.LOW 49N53W 996 MB MOVING E 10 KT. WITHIN 300 NM N SEMICIRCLE
AND WITHIN 660 NM SW QUADRANT WINDS 25 TO 35 KT. SEAS TO 12 FT.
.24 HOUR FORECAST LOW ABSORBED INTO POST-TROPICAL CYCLONE GERT
WITH CONDITIONS DESCRIBED ABOVE.

...GALE WARNING...
.24 HOUR FORECAST N OF 61N BETWEEN 50W AND 55W WINDS 20 TO 30
KT. SEAS TO 8 FT.
.48 HOUR FORECAST LOW 62N55W 1004 MB. WITHIN 240 NM E AND SE
QUADRANTS WINDS 25 TO 35 KT. SEAS TO 11 FT.

.SYNOPSIS AND FORECAST.

.24 HOUR FORECAST W OF A LINE FROM 35N72W TO 43N66W WINDS TO 25
KT. SEAS LESS THAN 8 FT.
.48 HOUR FORECAST N OF 38N BETWEEN 60W AND 70W WINDS TO 25 KT.
SEAS TO 8 FT.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM WITHIN 240 NM N OF
A LINE FROM 50N53W TO 33N35W.
.24 HOUR FORECAST DENSE FOG E OF AREA.

.HIGH 34N36W 1025 MB NEARLY STATIONARY.
.24 HOUR FORECAST HIGH 34N35W 1025 MB.
.48 HOUR FORECAST HIGH 32N38W 1024 MB.

.HIGH 38N70W 1018 MB MOVING NE 20 KT.
.24 HOUR FORECAST HIGH 42N61W 1018 MB.
.48 HOUR FORECAST HIGH 45N52W 1024 MB.

.FORECASTER COLLINS. 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 0000 UTC FRI AUG 18.
24 HOUR FORECAST VALID 0000 UTC SAT AUG 19.
48 HOUR FORECAST VALID 0000 UTC SUN AUG 20.

.WARNINGS.

..TROPICAL STORM WARNING...
.TROPICAL STORM HARVEY NEAR 13.0N 57.4W 1005 MB AT 0300 UTC AUG
18 MOVING W OR 270 DEG AT 16 KT. MAXIMUM SUSTAINED WINDS 35 KT
GUSTS 45 KT. TROPICAL STORM FORCE WINDS WITHIN 50 NM N
SEMICIRCLE AND 0 NM S SEMICIRCLE. SEAS TO 12 FT WITHIN 60 NM N
SEMICIRCLE AND 0 NM S SEMICIRCLE. ELSEWHERE WITHIN 270 NM N
SEMICIRCLE WINDS 20 TO 33 KT. SEAS 8 TO 11 FT.
.24 HOUR FORECAST TROPICAL STORM HARVEY NEAR 13.6N 63.3W.
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. LITTLE CHANGE IN
RADIUS OF TROPICAL STORM FORCE WINDS. SEAS 12 FT OR GREATER
WITHIN 75 NM NE QUADRANT WITH SEAS TO 13 FT. ELSEWHERE WITHIN
270 NM N AND 60 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 11
FT.
.48 HOUR FORECAST TROPICAL STORM HARVEY NEAR 14.1N 70.9W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE
WINDS WITHIN 60 NM N SEMICIRCLE AND 30 NM S SEMICIRCLE. SEAS 12
FT OR GREATER WITHIN 75 NM N SEMICIRCLE WITH SEAS TO 15 FT.
ELSEWHERE WITHIN 240 NM N AND 75 NM S SEMICIRCLES WINDS 20 TO 33
KT. SEAS 8 TO 11 FT.
.72 HOUR FORECAST TROPICAL STORM HARVEY NEAR 14.8N 78.6W.
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 16.0N 85.5W.
MAXIMUM SUSTAINED WINDS 60 KT GUSTS 75 KT.
.120 HOUR FORECAST TROPICAL STORM HARVEY INLAND NEAR 17.5N
89.0W. MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 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 16N46.5W 1009 MB MOVING WNW 17 KT. WITHIN
270 NM N SEMICIRCLE OF LOW WINDS 20 TO 25 KT. SEAS 8 TO 11 FT.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
17.5N54W 1010 MB. WITHIN 270 NM NE SEMICIRCLE OF LOW WINDS 20 TO
30 KT. SEAS 8 TO 11 FT. ELSEWHERE FROM 17N TO 22N BETWEEN 48W
AND 58W WINDS 20 KT OR LESS. SEAS TO 9 FT IN NE TO E SWELL.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
19.5N61.5W 1011 MB. WITHIN 210 NM NE SEMICIRCLE OF LOW WINDS 20
TO 30 KT. SEAS 8 TO 11 FT. ELSEWHERE FROM 17N TO 23N BETWEEN 54W
AND 66W WINDS 20 KT OR LESS. SEAS TO 9 FT IN NE TO E SWELL.

.ATLC AND CARIBBEAN TROPICAL WAVE ALONG 71W-72W S OF 24N.
CARIBBEAN N OF 17N BETWEEN 70W AND 76.5W...INCLUDING WINDWARD
PASSAGE...AND ATLC S OF 22N BETWEEN 68W AND 74W WINDS 20 TO 25
KT. SEAS TO 8 FT. SCATTERED TO NUMEROUS SHOWERS AND TSTMS FROM
17N TO 25N BETWEEN 66W AND 71W.
.24 HOUR FORECAST TROPICAL WAVE ALONG 76W-77W S OF 24N. FROM 18N
TO 22N BETWEEN 67W AND 74W...INCLUDING MONA PASSAGE...E TO SE
WINDS 20 TO 25 KT...EXCEPT NE WINDS MONA PASSAGE. SEAS TO 8 FT.
.42 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.ATLC 24 HOUR FORECAST FROM 14N TO 19N BETWEEN 35W AND 39W NE TO
E WINDS 20 TO 25 KT. SEAS TO 8 FT.
.48 HOUR FORECAST FROM 15N TO 20N BETWEEN 41W AND 51W NE TO E
WINDS 20 TO 25 KT. SEAS TO 10 FT.

.CARIBBEAN 24 HOUR FORECAST FROM 11N TO 13N BETWEEN 70W AND 75W
NE WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.36 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 STRIPLING. NATIONAL HURRICANE CENTER.



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