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FZNT33 KWBC 220315
OFFN31

Marine Weather HF Voice Broadcast
NWS Ocean Prediction Center Washington DC
1115 PM 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
will track NE along outer Mid-Atlantic waters late tonight into
early Fri. Erin will then move farther away from the area over
the N Atlantic late Fri into Sat night. Long period S swell from
Hurricane Erin will continue 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.
Another cold front will move over the region Tue and Tue night.
For more information on Hurricane Erin, please closely monitor
the latest forecasts from the National Hurricane Center.

Gulf of Maine to the Hague Line

.TONIGHT...NE winds 20 to 30 kt. Seas 9 to 16 ft.
.FRI...N to NE winds 20 to 30 kt. Seas 12 to 19 ft.
.FRI NIGHT...N winds 10 to 20 kt, becoming S to SW 5 to 15 kt.
Seas 10 to 16 ft.
.SAT...S winds 5 to 15 kt, increasing to 10 to 20 kt. Seas 6 to
11 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 15 to 20 kt, diminishing to 10 to 15 kt.
Seas 3 to 5 ft.
.MON...S to SE winds 10 to 15 kt. Seas 3 to 4 ft.
.MON NIGHT...S winds less than 10 kt, becoming W to SW. Seas
3 to 5 ft.
.TUE...W winds 10 to 15 kt, becoming SW 10 to 20 kt. Seas 4 to
6 ft.
.TUE NIGHT...W to SW winds 10 to 20 kt. Seas 4 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...

.TONIGHT...E to NE winds 30 to 40 kt. Seas 14 to 29 ft. Rain.
.FRI...N winds 25 to 35 kt, diminishing to 20 to 30 kt. Seas
16 to 31 ft. Chance of showers and scattered tstms.
.FRI NIGHT...N winds 20 to 30 kt, diminishing to 5 to 15 kt.
Seas 14 to 23 ft.
.SAT...N to NE winds 5 to 15 kt, becoming S to SE 10 to 20 kt.
Seas 7 to 13 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 10 to 15 kt. Seas 4 to 6 ft.
.MON...SE winds 10 to 15 kt, increasing to 15 to 25 kt. Seas
4 to 7 ft.
.MON NIGHT...S to SW winds 10 to 20 kt, becoming W 10 to 15 kt.
Seas 4 to 7 ft.
.TUE...W winds 10 to 15 kt. Seas 4 to 6 ft.
.TUE NIGHT...W winds 10 to 20 kt. Seas 4 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...

.TONIGHT...NE winds 25 to 35 kt, becoming N. Seas 16 to 28 ft.
Chance of showers and tstms.
.FRI...N winds 20 to 30 kt. Seas 15 to 27 ft. Chance of showers.
.FRI NIGHT...N to NE winds 15 to 25 kt, becoming SW 5 to 15 kt.
Seas 11 to 18 ft.
.SAT...Variable winds 5 to 15 kt, becoming S to SW. Seas 6 to
11 ft.
.SAT NIGHT...S winds 10 to 15 kt. Seas 5 to 9 ft.
.SUN...S winds 5 to 10 kt, increasing to 10 to 15 kt. Seas 4 to
8 ft.
.SUN NIGHT...S to SE winds 5 to 15 kt. Seas 3 to 6 ft.
.MON...SE winds 5 to 15 kt, becoming variable. Seas 3 to 6 ft.
.MON NIGHT...W winds 10 to 15 kt, becoming 10 to 20 kt. Seas
3 to 6 ft.
.TUE...W winds 10 to 15 kt, becoming 10 to 20 kt. Seas 3 to
5 ft.
.TUE NIGHT...W to NW winds 10 to 20 kt. Seas 3 to 6 ft.

.Forecaster Byrd. Ocean Prediction Center.