FZNT01 KWBC 272144
HSFAT1 2230
HIGH SEAS FORECAST FOR METAREA IV
NWS OCEAN PREDICTION CENTER WASHINGTON DC
2230 UTC FRI SEP 27 2024
SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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
[email protected](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).
THE NATIONAL WEATHER SERVICE IS ACCEPTING PUBLIC COMMENTS UNTIL
OCTOBER 16 2024 ON A PROPOSAL TO REPLACE FEET WITH METERS WHEN
DESCRIBING SEAS IN A VARIETY OF NATIONAL MARINE CENTER TEXT AND
GRAPHICAL PRODUCTS FOR THE HIGH SEAS AREAS ONLY.
TO LEARN MORE PLEASE VISIT (WEB ADDRESS LOWERCASE)
HTTPS://OCEAN.WEATHER.GOV/PROPOSED-METERS.PHP
FROM OCTOBER 15 TO APRIL 1, DUE TO THE CLIMATOLOGY OF THE NORTH
ATLANTIC AND THE FREQUENCY AND VOLUME OF WEATHER HAZARDS, ALONG
WITH CUSTOMER FEEDBACK, HIGH SEAS FORECASTS WILL BE LIMITED TO
WINDS OF 25 TO 35 KNOTS AND HIGHER, AND SEAS OF 12 FEET OR
GREATER, ALONG WITH FREEZING SPRAY, DENSE FOG, VOLCANIC ASH,
AND ANYTHING TROPICAL (INCLUDING A DEPRESSION). LESSER
CONDITIONS WILL BE INCLUDED FOR WARNING CONDITIONS AND TO
PRESERVE CONTINUITY WHERE APPROPRIATE.
SECURITE
NORTH ATLANTIC NORTH OF 31N TO 67N AND WEST OF 35W
ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS
SYNOPSIS VALID 1800 UTC SEP 27.
24 HOUR FORECAST VALID 1800 UTC SEP 28.
48 HOUR FORECAST VALID 1800 UTC SEP 29.
.WARNINGS.
…HURRICANE WARNING…
.HURRICANE ISAAC NEAR 37.8N 45.3W 976 MB AT 2100 UTC SEP 27
MOVING E OR 080 DEG AT 14 KT. MAXIMUM SUSTAINED WINDS 75 KT
GUSTS 90 KT. TROPICAL STORM FORCE WINDS WITHIN 40 NM NE
QUADRANT…80 NM SE QUADRANT…70 NM SW QUADRANT…AND 60 NM NW
QUADRANT. SEAS 12 FT OR GREATER WITHIN 90 NM N SEMICIRCLE AND
180 NM S SEMICIRCLE WITH SEAS TO 16 FT. ELSEWHERE S OF 44N
BETWEEN 40W AND 44W WINDS 20 TO 33 KT. SEAS TO 12 FT.
.24 HOUR FORECAST HURRICANE ISAAC NEAR 40.3N 39.8W. MAXIMUM
SUSTAINED WINDS 75 KT GUSTS 90 KT. TROPICAL STORM FORCE WINDS
WITHIN 120 NM E SEMICIRCLE AND 100 NM W SEMICIRCLE. SEAS 12 FT
OR GREATER WITHIN 240 NM NE QUADRANT…360 NM SE QUADRANT…180
NM SW QUADRANT…AND 270 NM NW QUADRANT WITH SEAS TO 30 FT.
ELSEWHERE S OF 47N E OF 46W WINDS 20 TO 33 KT. SEAS TO 12 FT.
.48 HOUR FORECAST HURRICANE ISAAC NEAR 43.1N 36.3W. MAXIMUM
SUSTAINED WINDS 65 KT GUSTS 80 KT. TROPICAL STORM FORCE WINDS
WITHIN 180 NM NE QUADRANT…130 NM SE QUADRANT…110 NM SW
QUADRANT…AND 160 NM NW QUADRANT. SEAS 12 FT OR GREATER
WITHIN 300 NM NE QUADRANT…420 NM SE QUADRANT…300 NM SW
QUADRANT…AND 360 NM NW QUADRANT WITH SEAS TO 28 FT. ELSEWHERE S
OF 49N E OF 42W WINDS 20 TO 33 KT. SEAS TO 12 FT.
…GALE WARNING…
.LOW 45N33W 1001 MB MOVING NE 25 KT. WITHIN 240 NM W SEMICIRCLE
WINDS 25 TO 35 KT. SEAS 9 TO 16 FT.
.06 HOUR FORECAST LOW AND CONDITIONS E OF AREA.
…GALE WARNING…
.LOW 45N64W 1009 MB MOVING SE 20 KT. FROM 41N TO 49N BETWEEN 57W
AND 65W WINDS 20 TO 30 KT. SEAS TO 8 FT.
.24 HOUR FORECAST LOW 43N55W 1002 MB. FROM 36N TO 48N BETWEEN 50W
AND 65W WINDS 25 TO 35 KT. SEAS TO 12 FT.
.48 HOUR FORECAST LOW 40N51W 1000 MB. S OF 47N BETWEEN 42W AND
63W WINDS 25 TO 35 KT. SEAS 8 TO 15 FT.
…GALE WARNING…
.N OF 63N W OF GREENLAND COAST AREA OF S TO SW WINDS 20 TO 30 KT.
SEAS TO 8 FT.
.24 HOUR FORECAST N OF 61N BETWEEN W GREENLAND COAST AND 56W AREA
OF S TO SE WINDS 20 TO 30 KT. SEAS TO 8 FT.
.36 HOUR FORECAST WITHIN 120 NM OF W GREENLAND COAST N OF 60N W
OF 46W WINDS 25 TO 35 KT. SEAS TO 11 FT…HIGHEST NEAR 67N54W.
.48 HOUR FORECAST NEW LOW 56N69W 993 MB. WITHIN 120 NM OF W
GREENLAND COAST N OF 60N W OF 46W…AND FROM 58N TO 65N W OF 58W
WINDS 25 TO 40 KT. SEAS 8 TO 14 FT. ELSEWHERE N OF 52N W OF 47W
WINDS TO 25 KT. SEAS TO 8 FT.
.SYNOPSIS AND FORECAST.
.POST-TROPICAL CYCLONE HELENE NEAR 37.5N 85.5W 984 MB AT 2100
UTC SEP 27 MOVING NNW OR 330 DEG AT 15 KT. MAXIMUM SUSTAINED
WINDS 30 KT GUSTS 40 KT. SEAS 12 FT OR GREATER WITHIN 480 NM SE
QUADRANT WITH SEAS TO 16 FT. ELSEWHERE S OF 37N W OF 73W WINDS 20
TO 30 KT. SEAS TO 12 FT.
.12 HOUR FORECAST POST-TROPICAL CYCLONE HELENE NEAR 37.9N
87.0W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT.
.24 HOUR FORECAST POST-TROPICAL CYCLONE HELENE NEAR 37.7N
87.2W. MAXIMUM SUSTAINED WINDS 20 KT GUSTS 30 KT. S OF 40N W OF
70W WINDS TO 25 KT. SEAS TO 8 FT.
.48 HOUR FORECAST POST-TROPICAL CYCLONE HELENE NEAR 37.3N
87.0W. MAXIMUM SUSTAINED WINDS 20 KT GUSTS 30 KT.
.LOW E OF AREA 59N30W 1009 MB MOVING E 10 KT. N OF 53N E OF 40W
WINDS TO 25 KT. SEAS TO 8 FT.
.24 HOUR FORECAST LOW E OF AREA AND NEW LOW E OF AREA 64N31W 1007
MB. N OF 64N E 37N WINDS 20 TO 30 KT. SEAS TO 9 FT.
.48 HOUR FORECAST LOW E OF AREA. N OF 60N E OF 37W WINDS TO 25
KT. SEAS TO 11 FT.
.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 60N TO 64N
BETWEEN 49W AND 52S SEMICIRCLE WITH SEAS TO 14 FT.
ELSEWHERE WITHIN 20N42W TO 21N44W TO 19N45W TO 18N44W TO 18N42W
TO 19N41W TO 20N42W WINDS 20 TO 33 KT. SEAS 10 TO 12 FT.
REMAINDER OF AREA WITHIN 22N39W TO 22N43W TO 20N45W TO 17N43W TO
18N41W TO 18N38W TO 22N39W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT
IN E SWELL.
.24 HOUR FORECAST TROPICAL STORM JOYCE NEAR 19.5N 47.1W. MAXIMUM
SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE WINDS
WITHIN 80 NM NE QUADRANT…30 NM SE QUADRANT…20 NM SW
QUADRANT…AND 60 NM NW QUADRANT. SEAS 12 FT OR GR
