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FZNT33 KWBC 210856
OFFN31

Marine Weather HF Voice Broadcast
NWS Ocean Prediction Center Washington DC
456 AM EDT Thu Aug 21 2025

New England continental shelf and slope waters from 25 nm
offshore to the Hague Line, except to 1000 fm south of New
England.

Conditions given represent the highest within that period.

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.

Locally higher winds and seas can be expected in and near tstms.

.SYNOPSIS FOR NEW ENGLAND WATERS...The center of Hurricane Erin
is expected to track NE through the outer Mid-Atlantic waters
today into early Fri, remaining S and then SE of the waters. Erin
will then move farther away from the area over the N Atlantic
late Fri into Sat. Long period S swell from Hurricane Erin will
continue through tonight before backing to the SE and E by later
Fri and Fri night. A high pressure ridge will move E across the
waters Fri night and Sat, then shift E of the area Sat night into
Sun. A cold front will gradually approach the waters from the W
late Sun night, then move E across the area Mon and Mon night as
developing low pressure tracks NE along the front. For more
information on Hurricane Erin, please closely monitor the latest
forecasts from the National Hurricane Center.

Gulf of Maine to the Hague Line

.TODAY...E winds 5 to 15 kt, increasing to 10 to 20 kt. Seas
6 to 10 ft. Chance of showers.
.TONIGHT...NE winds 20 to 30 kt. Seas 8 to 16 ft.
.FRI...N to NE winds 20 to 30 kt. Seas 10 to 19 ft.
.FRI NIGHT...N winds 10 to 20 kt, becoming SW. Seas 9 to 16 ft.
.SAT...S winds 5 to 15 kt, increasing to 10 to 20 kt. Seas 6 to
10 ft.
.SAT NIGHT...S winds 10 to 20 kt. Seas 4 to 8 ft.
.SUN...S winds 10 to 20 kt. Seas 4 to 7 ft.
.SUN NIGHT...S winds 10 to 20 kt. Seas 3 to 5 ft.
.MON...S winds 10 to 15 kt, becoming S to SE 10 to 20 kt. Seas
3 to 4 ft.
.MON NIGHT...S to SE winds 15 to 25 kt, becoming W to SW 5 to
15 kt. Seas 3 to 6 ft.

Georges Bank...from the Northeast Channel to the Great South
Channel including waters east of Cape Cod...to the Hague Line

...TROPICAL STORM WARNING...

.TODAY...E winds 15 to 25 kt, increasing to 25 to 35 kt. Seas
8 to 15 ft, building to 10 to 19 ft. Chance of showers and
tstms.
.TONIGHT...E to NE winds 35 to 45 kt. Seas 14 to 29 ft. Rain.
.FRI...N to NE winds 35 to 45 kt, becoming N 20 to 30 kt. Seas
16 to 31 ft. Chance of showers and scattered tstms.
.FRI NIGHT...N winds 20 to 30 kt, becoming N to NW 10 to 20 kt.
Seas 12 to 23 ft.
.SAT...S to SE winds 10 to 20 kt. Seas 7 to 12 ft.
.SAT NIGHT...S winds 10 to 20 kt, diminishing to 5 to 15 kt.
Seas 6 to 9 ft.
.SUN...S winds 5 to 15 kt. Seas 5 to 8 ft.
.SUN NIGHT...S winds 5 to 15 kt. Seas 4 to 6 ft.
.MON...SE winds 10 to 20 kt, increasing to 20 to 30 kt. Seas
4 to 7 ft.
.MON NIGHT...S winds 20 to 30 kt, becoming W 10 to 20 kt. Seas
3 to 6 ft.

South of New England...from the Great South Channel to Hudson
Canyon including the waters south of Marthas Vineyard and
Nantucket Island...out to 1000 fm

...TROPICAL STORM WARNING...

.TODAY...E to NE winds 20 to 30 kt, becoming NE 25 to 35 kt.
Seas 9 to 18 ft, building to 12 to 23 ft. Chance of showers and
tstms.
.TONIGHT...N to NE winds 30 to 40 kt. Seas 13 to 28 ft. Chance
of showers and tstms.
.FRI...N winds 25 to 35 kt, diminishing to 20 to 30 kt. Seas
14 to 27 ft. Chance of showers.
.FRI NIGHT...N to NE winds 15 to 25 kt, becoming W to SW 10 to
20 kt. Seas 10 to 18 ft.
.SAT...S to SW winds 10 to 20 kt. Seas 6 to 11 ft.
.SAT NIGHT...S winds 10 to 20 kt, becoming 10 to 15 kt. Seas
4 to 8 ft.
.SUN...S winds 5 to 15 kt, increasing to 10 to 20 kt. Seas 4 to
7 ft.
.SUN NIGHT...S to SE winds 5 to 15 kt. Seas 3 to 6 ft.
.MON...SE winds 10 to 20 kt, becoming W to SW. Seas 3 to 6 ft.
.MON NIGHT...W winds 10 to 20 kt. Seas 3 to 6 ft.

.Forecaster Mills. Ocean Prediction Center.