165
FZNT31 KNHC 231503
OFFN20

Marine Weather HF Voice Broadcast
NWS National Hurricane Center Miami, FL
1103 AM EDT Sat Aug 23 2025

Marine Weather HF Voice Broadcast for the Tropical N Atlantic
from 07N to 19N W of 55W, the N Atlantic from 19N to
31N W of 55W including the Bahamas, and the Caribbean Sea.

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.

Synopsis for Caribbean Sea and Tropical N Atlantic from
07N to 19N W of 55W

.SYNOPSIS...Fresh to strong trades and moderate to locally rough
seas will prevail over the central Caribbean this evening
through the next several days as central Atlantic high pressure
builds W-SW across the western Atlantic, in the wake of distant
extratropical cyclone Erin. Fresh to strong E to SE winds will
pulse across the Gulf of Honduras at night. Moderate to fresh
trades are expected in the eastern Caribbean and across the
approach to the Windward Passage, increasing to fresh to strong
late in the weekend into early next week. Meanwhile, showers and
thunderstorms continue in association with a central Atlantic
tropical wave along 49W this morning. Some development of this
system could occur during the next few days while the system
moves quickly westward at near 20 kt. Locally heavy rainfall and
gusty winds are possible across portions of the Windward Islands
and the eastern Caribbean as the system moves through on Sun and
Mon. By the middle of next week, conditions over the central
Caribbean are expected to be unfavorable for further
development.

NW Caribbean W of 85W

.THIS AFTERNOON...E winds 10 to 15 kt. Seas 4 to 6 ft.
.TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft.
.SUN...E winds 10 to 15 kt. Seas 4 to 6 ft.
.SUN NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft.
.MON...E winds 10 to 20 kt. Seas 4 to 6 ft.
.MON NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.TUE...E winds 10 to 15 kt. Seas 3 to 5 ft.
.TUE NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft.
.WED...NE winds less than 10 kt. Seas 3 to 5 ft.
.WED NIGHT...E winds less than 10 kt. Seas 3 ft.

Caribbean N of 15N between 72W and 85W

.THIS AFTERNOON...E winds 10 to 15 kt S of 18N, and E less than
10 kt elsewhere. Seas 3 to 5 ft.
.TONIGHT...E winds 10 to 15 kt S of 18N, and E less than 10 kt
elsewhere. Seas 3 to 5 ft.
.SUN...E winds 10 to 15 kt. Seas 3 to 5 ft.
.SUN NIGHT...E winds 10 to 20 kt S of 18N, and E less than 10 kt
elsewhere. Seas 4 to 6 ft.
.MON...E winds 10 to 20 kt. Seas 4 to 6 ft.
.MON NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.TUE...E winds 10 to 20 kt. Seas 5 to 7 ft.
.TUE NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft.
.WED...E winds 10 to 20 kt. Seas 5 to 7 ft.
.WED NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft.

Caribbean from 11N to 15N W of 72W

.THIS AFTERNOON...E winds 10 to 15 kt. Seas 5 to 6 ft.
.TONIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft.
.SUN...E winds 15 to 25 kt within 90 nm of coast of Colombia,
and E 10 to 20 kt elsewhere. Seas 5 to 7 ft.
.SUN NIGHT...E winds 15 to 25 kt within 90 nm of coast of
Colombia, and E 10 to 20 kt elsewhere. Seas 6 to 8 ft.
.MON...E winds 15 to 25 kt. Seas 6 to 9 ft.
.MON NIGHT...NE winds 15 to 25 kt. Seas 6 to 9 ft.
.TUE...NE winds 10 to 20 kt. Seas 6 to 9 ft.
.TUE NIGHT...NE winds 10 to 20 kt. Seas 6 to 9 ft.
.WED...E winds 10 to 20 kt. Seas 6 to 9 ft.
.WED NIGHT...NE winds 10 to 20 kt. Seas 6 to 8 ft.

SW Caribbean S of 11N

.THIS AFTERNOON...W winds less than 10 kt. Seas 4 to 6 ft.
.TONIGHT...NW winds less than 10 kt. Seas 3 to 5 ft.
.SUN...Variable winds less than 10 kt. Seas 3 to 5 ft.
.SUN NIGHT...NW winds less than 10 kt. Seas 3 to 4 ft.
.MON...NW winds less than 10 kt. Seas 4 to 6 ft.
.MON NIGHT...N winds less than 10 kt, increasing to 10 to 15 kt
after midnight. Seas 4 to 6 ft.
.TUE...NE winds 10 to 15 kt. Seas 5 to 7 ft.
.TUE NIGHT...NE winds less than 10 kt. Seas 6 to 8 ft.
.WED...E winds less than 10 kt, shifting to W in the afternoon.
Seas 5 to 7 ft.
.WED NIGHT...NW winds less than 10 kt. Seas 4 to 6 ft.

Caribbean between 64W and 72W

.THIS AFTERNOON...E winds 10 to 15 kt. Seas 3 to 5 ft.
.TONIGHT...NE winds 15 to 25 kt Gulf of Venezuela, and E 10 to
20 kt elsewhere. Seas 4 to 6 ft.
.SUN...E winds 15 to 25 kt Gulf of Venezuela, and E 10 to 20 kt
elsewhere. Seas 5 to 7 ft.
.SUN NIGHT...E winds 20 to 30 kt Gulf of Venezuela, and E 10 to
20 kt elsewhere. Seas 5 to 7 ft.
.MON...E winds 10 to 20 kt. Seas 5 to 7 ft.
.MON NIGHT...E winds 15 to 25 kt. Seas 6 to 9 ft.
.TUE...E winds 10 to 20 kt. Seas 6 to 9 ft.
.TUE NIGHT...E winds 10 to 20 kt. Seas 6 to 9 ft.
.WED...E winds 10 to 20 kt. Seas 6 to 8 ft.
.WED NIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft.

Offshore Leeward Islands and adjacent ATLC waters from 15N to
19N W of 55W

.THIS AFTERNOON...E winds 10 to 15 kt. Seas 4 to 6 ft.
.TONIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft.
.SUN...E winds 10 to 20 kt. Seas 6 to 9 ft.
.SUN NIGHT...E winds 10 to 20 kt. Seas 6 to 9 ft.
.MON...E winds 10 to 20 kt. Seas 6 to 9 ft.
.MON NIGHT...E winds 10 to 15 kt. Seas 6 to 8 ft.
.TUE...E winds 10 to 15 kt. Seas 5 to 7 ft.
.TUE NIGHT...E winds less than 10 kt. Seas 4 to 6 ft.
.WED...SE winds less than 10 kt. Seas 4 to 6 ft.
.WED NIGHT...E winds less than 10 kt. Seas 3 to 5 ft.

Offshore Windward Islands and adjacent ATLC waters from 07N to
15N W of 55W

.THIS AFTERNOON...E winds 10 to 15 kt. Seas 4 to 6 ft.
.TONIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft.
.SUN...E winds 10 to 15 kt. Seas 5 to 7 ft.
.SUN NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft.
.MON...E winds 10 to 15 kt. Seas 5 to 7 ft.
.MON NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft.
.TUE...E winds 10 to 15 kt. Seas 5 to 7 ft.
.TUE NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft.
.WED...SE winds 10 to 15 kt. Seas 4 to 6 ft.
.WED NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft.

Synopsis for the the SW N Atlantic including the Bahamas

.SYNOPSIS...Large northerly swell generated by extratropical
cyclone Erin will continue to affect the W Atlantic waters
through the next few days. In the wake of Erin, central Atlantic
high pressure will build W-SW toward the central Bahamas and the
Straits of Florida. Meanwhile, showers and thunderstorms have
become better organized in association with low pressure, AL90,
near 25.5N62W. Gale-force winds are expected to develop with
this system late this afternoon or evening as it moves
northward, and is expected to cross 31N Sun evening.
Environmental conditions appear conducive for further development
of this system, and a tropical storm is expected to form this
weekend. A slow moving cold front will move off the SE U.S. into
the NW waters by the middle of next week.

ATLC waters from 27N to 31N W of 77W

.THIS AFTERNOON...SW winds less than 10 kt. Seas 6 to 7 ft.
.TONIGHT...SW winds less than 10 kt, increasing to 10 to 15 kt
after midnight. Seas 6 to 7 ft.
.SUN...SW winds 10 to 15 kt. Seas 6 to 7 ft.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 5 to 7 ft.
.MON...W winds 10 to 15 kt. Seas 5 to 6 ft.
.MON NIGHT...SW winds 10 kt. Seas 4 to 5 ft.
.TUE...SW winds less than 10 kt. Seas 3 to 5 ft.
.TUE NIGHT...S winds less than 10 kt. Seas 3 to 4 ft.
.WED...Variable winds less than 10 kt. Seas 3 ft.
.WED NIGHT...E winds less than 10 kt. Seas 3 ft.

ATLC waters from 27N to 31N between 65W and 77W

.THIS AFTERNOON...S winds less than 10 kt W of 70W, and Variable
less than 10 kt elsewhere. Seas 8 to 11 ft.
.TONIGHT...SW winds 10 kt W of 70W, and Variable less than 10 kt
elsewhere. Seas 7 to 10 ft.
.SUN...SW winds 10 to 15 kt W of 70W, and SW less than 10 kt
elsewhere. Seas 7 to 9 ft.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 6 to 8 ft.
.MON...SW winds 10 to 15 kt. Seas 6 to 8 ft.
.MON NIGHT...SW winds 10 to 15 kt. Seas 5 to 7 ft.
.TUE...SW winds 10 to 15 kt, diminishing to less than 10 kt in
the afternoon. Seas 4 to 6 ft.
.TUE NIGHT...S winds less than 10 kt. Seas 3 to 5 ft.
.WED...S winds less than 10 kt. Seas 3 to 4 ft.
.WED NIGHT...SE winds less than 10 kt. Seas 3 to 4 ft.

Bahamas N of 22N

.THIS AFTERNOON...S winds less than 10 kt. Seas 3 to 5 ft.
.TONIGHT...SE winds less than 10 kt. Seas 3 to 5 ft.
.SUN...SE winds less than 10 kt. Seas 3 to 5 ft.
.SUN NIGHT...SE winds less than 10 kt. Seas 3 to 5 ft.
.MON...SE winds less than 10 kt. Seas 3 to 5 ft.
.MON NIGHT...SE winds less than 10 kt, increasing to 10 to 15 kt
after midnight. Seas 3 to 4 ft.
.TUE...SE winds 10 to 15 kt. Seas 3 to 4 ft.
.TUE NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft.
.WED...E winds 10 to 15 kt. Seas 3 to 4 ft.
.WED NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft.

ATLC waters from 22N to 27N between 65W and the Bahamas

.THIS AFTERNOON...Variable winds less than 10 kt, becoming SE
less than 10 kt in the afternoon. Seas 7 to 9 ft.
.TONIGHT...SE winds less than 10 kt. Seas 7 to 9 ft.
.SUN...SE winds less than 10 kt. Seas 7 to 8 ft.
.SUN NIGHT...SE winds 10 kt. Seas 6 to 7 ft.
.MON...SE winds 10 kt. Seas 6 to 7 ft.
.MON NIGHT...SE winds 10 kt. Seas 5 to 7 ft.
.TUE...E winds 10 to 15 kt. Seas 4 to 6 ft.
.TUE NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft.
.WED...E winds 10 to 15 kt. Seas 4 to 6 ft.
.WED NIGHT...E winds 10 kt. Seas 4 to 5 ft.

ATLC waters S of 22N W of 65W

.THIS AFTERNOON...E winds less than 10 kt. Seas 4 to 6 ft.
.TONIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft.
.SUN...E winds 10 to 15 kt. Seas 4 to 6 ft.
.SUN NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft.
.MON...E winds 10 to 15 kt. Seas 5 to 7 ft.
.MON NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft.
.TUE...E winds 10 to 20 kt. Seas 5 to 7 ft.
.TUE NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft.
.WED...E winds 10 to 15 kt. Seas 4 to 6 ft.
.WED NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft.

ATLC waters from 19N to 22N between 55W and 65W

.THIS AFTERNOON...SE winds 10 to 15 kt, diminishing to less than
10 kt in the afternoon. Seas 5 to 7 ft.
.TONIGHT...E winds 10 to 15 kt. Seas 6 to 7 ft.
.SUN...E winds 10 to 15 kt. Seas 7 to 8 ft.
.SUN NIGHT...E winds 10 to 15 kt. Seas 7 to 8 ft.
.MON...E winds 10 to 15 kt. Seas 7 to 8 ft.
.MON NIGHT...E winds 10 to 15 kt. Seas 7 to 8 ft.
.TUE...E winds 10 to 15 kt. Seas 6 to 7 ft.
.TUE NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft.
.WED...SE winds 10 kt. Seas 5 to 6 ft.
.WED NIGHT...SE winds 10 kt. Seas 5 ft.