HSFAT1
HIGH SEAS FORECAST FOR METAREA IV
NWS OCEAN PREDICTION CENTER WASHINGTON DC
2230 UTC TUE AUG 18 2026
CCODE/1:31:04:01:00/AOE/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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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).
FOR INFORMATION ON ATLANTIC ICEBERGS SEE INFORMATION FROM NORTH
ATLANTIC ICE SERVICE AT HTTPS://OCEAN.WEATHER.GOV/ATL_TAB.PHP
(ALL LOWERCASE).
FOR ANY TROPICAL CYCLONE INFORMATION BEYOND 48 HOURS REFERENCE
THE ASSOCIATED NWS TROPICAL CYCLONE FORECAST/ADVISORY (TCM).
SECURITE
NORTH ATLANTIC NORTH OF 31N TO 67N AND WEST OF 35W
ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS
SYNOPSIS VALID 1800 UTC AUG 18.
24 HOUR FORECAST VALID 1800 UTC AUG 19.
48 HOUR FORECAST VALID 1800 UTC AUG 20.
.WARNINGS.
...GALE WARNING...
.LOW 42N66W 1007 MB MOVING NE 15 KT. WITHIN 240 NM SE QUADRANT
WINDS 25 TO 35 KT. SEAS 2.5 TO 3.5 M. ELSEWHERE WITHIN 360 NM S
AND SE AND 240 NM E QUADRANTS WINDS TO 25 KT. SEAS TO 3 M.
.24 HOUR FORECAST LOW 47N62W 1008 MB. WITHIN 300 NM E SEMICIRCLE
AND WITHIN 240 NM E OF A FRONT FROM LOW TO 37N65W WINDS 20 TO 30
KT. SEAS TO 3 M.
.48 HOUR FORECAST LOW DISSIPATED WITH CONDITIONS MERGED WITH NEW
LOW 56N60W IN SYNOPSIS AND FORECAST.
.SYNOPSIS AND FORECAST.
.LOW N OF AREA. WITHIN 90 NM OF W GREENLAND COAST N OF 61N AREA
OF SE TO S WINDS 20 TO 30 KT. SEAS TO 3 M.
.24 HOUR FORECAST CONDITIONS DIMINISHED.
.LOW 57N58W 1010 MB MOVING NE 15 KT. FROM 50N TO 56N BETWEEN 47W
AND 57W WINDS TO 25 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST LOW DISSIPATED. FROM 55N TO 62N BETWEEN 38W
AND 45W AREA OF S TO SW WINDS LESS THAN 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST NEW LOW 65N39W 1011 MB. FROM 59N TO 61N
BETWEEN 37W AND 43W AREA OF SW WINDS TO 25 KT. SEAS LESS THAN
2.5 M.
.LOW 38N48W 1013 MB MOVING NE 05 KT. WITHIN 240 NM SE...W AND NW
QUADRANTS WINDS TO 25 KT. SEAS TO 3 M.
.24 HOUR FORECAST LOW 40N46W 1017 MB. WITHIN 240 NM NE AND E
SEMICIRCLES WINDS LESS THAN 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST LOW DISSIPATED. CONDITIONS DIMINISHED.
.LOW 42N45W 1016 MB MOVING NE 10 KT. WITHIN 240 NM NE QUADRANT
WINDS TO 25 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST LOW 47N43W 1018 MB. WITHIN 300 NM NE QUADRANT
WINDS LESS THAN 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST LOW 48N40W 1018 MB. WITHIN 240 NM N SEMICIRCLE
WINDS LESS THAN 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST NEW LOW 58N59W 999 MB. FROM 50N TO 59N BETWEEN
49W AND 57W...AND N OF 61N BETWEEN 180 NM AND 420 NM NW QUADRANT
WINDS 20 TO 30 KT. SEAS TO 3.5 m.
.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 43N TO 45N
BETWEEN 66W AND 69W...BETWEEN 57W AND A LINE FROM 57N48W TO
59N45W TO 65N54W...AND WITHIN 240 NM SW OF A LINE FROM 55N52W TO
61N59W.
.24 HOUR FORECAST DENSE FOG FROM 41N TO 45N BETWEEN 64W AND
69W...WITHIN THE GULF OF SAINT LAWRENCE N OF 47N W OF 63W...AND
W AND NW OF A LINE FROM 53N56W TO 62N40W.
.48 HOUR FORECAST DENSE FOG FROM 41N TO 45N BETWEEN 64W AND
69W...FROM 45N TO 47N BETWEEN 56W AND 59W...WITHIN 90 NM NW OF A
LINE FROM 50N58W TO 48N63W...WITHIN 120 NM SW OF A LINE FROM
48N44W TO 53N49W...BETWEEN 58W AND A LINE FROM 61N36W TO 57N35W
TO 57N47W TO 60N58W...AND N OF 56N W OF 58W.
.FORECASTER BANCROFT. OCEAN PREDICTION CENTER.
NATIONAL HURRICANE CENTER MIAMI FL
ATLANTIC FROM 07N TO 31N W OF 35W INCLUDING CARIBBEAN SEA AND
GULF OF AMERICA
SYNOPSIS VALID 1800 UTC TUE AUG 18.
24 HOUR FORECAST VALID 1800 UTC WED AUG 19.
48 HOUR FORECAST VALID 1800 UTC THU AUG 20.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.CARIBBEAN WITHIN 13N73W TO 12N75W TO 11N76W TO 12N73W TO 11N72W
TO 11N70W TO 13N73W NE WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST WITHIN 14N72W TO 13N74W TO 12N74W TO 11N73W TO
12N72W TO 13N71W TO 14N72W NE TO E WINDS 20 TO 30 KT. SEAS 2.5
M.
.48 HOUR FORECAST WITHIN 13N69W TO 15N72W TO 15N76W TO 13N79W TO
11N76W TO 12N69W TO 13N69W NE TO E WINDS 20 TO 30 KT. SEAS 2.5
TO 3.0 M.
.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.
$$
.FORECASTER AL. NATIONAL HURRICANE CENTER.