389
FZNT31 KNHC 220817
OFFN20

Marine Weather HF Voice Broadcast
NWS National Hurricane Center Miami, FL
417 AM EDT Fri Aug 22 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 seas, locally
rough, will exist over the central Caribbean through the next
several days as a strengthening pressure gradient develops
between low pressure over Colombia and building high pressure in
the wake of Hurricane Erin in the west Atlantic. Fresh to strong
east to southeast winds will pulse near the Gulf of Honduras at
night. Moderate to fresh trades will pulse in the eastern
Caribbean and across the approach to the Windward Passage with
moderate or weaker winds elsewhere. An area of disorganized
showers and thunderstorms associated with a tropical wave is
located a couple hundred nautical miles ENE of the northern
Leeward Islands. Environmental conditions appear conducive for
further development of this system, and a tropical depression is
likely to form this weekend while it moves northwestward and
then northward, in between the Lesser Antilles and Bermuda. This
system has a high chance of tropical cyclone formation, and
regardless of development, expecting increasing winds and
building seas with it.

NW Caribbean W of 85W

.TODAY...SE winds 10 to 15 kt. Seas 3 ft.
.TONIGHT...SE winds 10 to 20 kt. Seas 3 to 5 ft.
.SAT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.SAT NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft.
.SUN...E winds 10 to 15 kt. Seas 3 to 5 ft.
.SUN NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft.
.MON...E winds 10 to 20 kt. Seas 3 to 5 ft.
.MON NIGHT...E winds 10 to 20 kt. Seas 3 to 5 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.

Caribbean N of 15N between 72W and 85W

.TODAY...E winds 10 to 15 kt. Seas 4 to 6 ft S of 18N, and 3 ft
elsewhere.
.TONIGHT...E winds 10 to 15 kt S of 18N, and E less than 10 kt
elsewhere. Seas 4 to 6 ft S of 18N, and 3 ft elsewhere.
.SAT...S of 18N, E winds 10 to 15 kt. Elsewhere, E winds less
than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas
3 to 5 ft.
.SAT NIGHT...E winds 10 to 15 kt S of 18N, and E less than 10 kt
elsewhere. S of 18N, seas 3 to 5 ft. Elsewhere, seas 3 ft in the
evening, subsiding to 2 ft or less.
.SUN...E winds 10 to 15 kt. Seas 3 to 5 ft.
.SUN NIGHT...E winds 10 to 20 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 20 kt. Seas 4 to 6 ft.
.TUE NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.

Caribbean from 11N to 15N W of 72W

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

SW Caribbean S of 11N

.TODAY...N winds less than 10 kt, shifting to SW in the
afternoon. Seas 4 to 6 ft.
.TONIGHT...NW winds less than 10 kt. Seas 4 to 6 ft.
.SAT...SE winds less than 10 kt. Seas 3 to 5 ft.
.SAT NIGHT...SW winds less than 10 kt. Seas 3 to 5 ft.
.SUN...Variable winds less than 10 kt. Seas 3 to 4 ft.
.SUN NIGHT...Variable winds less than 10 kt. Seas 3 to 4 ft.
.MON...NW winds less than 10 kt. Seas 3 to 5 ft.
.MON NIGHT...NW winds less than 10 kt, shifting to N after
midnight. Seas 4 to 6 ft.
.TUE...NE winds 10 to 15 kt. Seas 5 to 7 ft.
.TUE NIGHT...N winds less than 10 kt, shifting to NE after
midnight. Seas 5 to 7 ft.

Caribbean between 64W and 72W

.TODAY...E winds 10 to 20 kt. Seas 4 to 6 ft.
.TONIGHT...NE winds 15 to 20 kt Gulf of Venezuela, and E 10 to
15 kt elsewhere. Seas 3 to 5 ft.
.SAT...NE winds 10 to 20 kt Gulf of Venezuela, and E 10 to 15 kt
elsewhere. Seas 3 to 5 ft.
.SAT NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.SUN...E winds 10 to 20 kt. Seas 5 to 7 ft.
.SUN NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft.
.MON...E winds 10 to 20 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.

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

.TODAY...SE winds 10 to 15 kt. Seas 4 to 6 ft.
.TONIGHT...SE winds less than 10 kt. Seas 3 to 5 ft.
.SAT...E winds 10 to 15 kt. Seas 4 to 6 ft.
.SAT NIGHT...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 6 to 8 ft.
.MON...E winds 10 to 15 kt. Seas 6 to 8 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 10 to 15 kt. Seas 4 to 6 ft.

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

.TODAY...SE winds 10 to 15 kt. Seas 3 to 5 ft.
.TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft.
.SAT...E winds 10 to 15 kt. Seas 4 to 6 ft.
.SAT NIGHT...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 20 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.

Synopsis for the the SW N Atlantic including the Bahamas

.SYNOPSIS...Hurricane Erin is centered N of the area and
continues to move NNE away from the region. Despite its
distance, long period northerly swells generated by 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 WSW toward the central Bahamas and the Straits of Florida.
An area of disorganized showers and thunderstorms associated with
a tropical wave is located a couple hundred nautical miles ENE
of the northern Leeward Islands. Environmental conditions appear
conducive for further development of this system, and a tropical
depression is likely to form this weekend while it moves
northwestward and then northward, in between the Lesser Antilles
and Bermuda. This system has a high chance of tropical cyclone
formation, and regardless of development, expecting increasing
winds and building seas with it E of 70W.

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

.TODAY...W winds less than 10 kt. Seas 6 to 8 ft.
.TONIGHT...Variable winds less than 10 kt. Seas 6 to 8 ft.
.SAT...Variable winds less than 10 kt. Seas 6 to 8 ft.
.SAT NIGHT...SW winds less than 10 kt. Seas 5 to 7 ft.
.SUN...SW winds 10 to 15 kt. Seas 5 to 6 ft.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 5 to 6 ft.
.MON...W winds 10 to 15 kt. Seas 4 to 5 ft.
.MON NIGHT...SW winds less than 10 kt. Seas 4 to 5 ft.
.TUE...SW winds less than 10 kt. Seas 3 to 4 ft.
.TUE NIGHT...Variable winds less than 10 kt, becoming SW less
than 10 kt after midnight. Seas 3 to 4 ft.

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

.TODAY...W winds less than 10 kt W of 70W, and W 10 to 20 kt
elsewhere. Seas 8 to 11 ft W of 70W, and 9 to 14 ft elsewhere.
.TONIGHT...W winds less than 10 kt. Seas 7 to 10 ft W of 70W,
and 9 to 13 ft elsewhere.
.SAT...Variable winds less than 10 kt. Seas 7 to 10 ft W of 70W,
and 9 to 12 ft elsewhere.
.SAT NIGHT...Variable winds less than 10 kt, becoming S less
than 10 kt after midnight. Seas 6 to 9 ft W of 70W, and 8 to
10 ft elsewhere.
.SUN...S winds less than 10 kt, shifting to SW in the afternoon.
Seas 6 to 9 ft.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 7 to 10 ft.
.MON...SW winds 10 to 15 kt. Seas 6 to 9 ft.
.MON NIGHT...SW winds 10 to 15 kt. Seas 6 to 9 ft.
.TUE...SW winds 10 to 15 kt. Seas 5 to 7 ft.
.TUE NIGHT...SW winds less than 10 kt. Seas 4 to 6 ft.

Bahamas N of 22N

.TODAY...S winds less than 10 kt in the morning, becoming
variable winds less than 10 kt. Seas 3 to 4 ft.
.TONIGHT...Variable winds less than 10 kt, becoming E less than
10 kt after midnight. Seas 3 to 4 ft.
.SAT...SE winds less than 10 kt. Seas 3 to 4 ft.
.SAT NIGHT...SE winds less than 10 kt. Seas 3 to 4 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...SE winds 10 to 15 kt. Seas 3 to 4 ft.

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

.TODAY...S winds less than 10 kt. Seas 5 to 7 ft.
.TONIGHT...NW winds less than 10 kt, shifting to SE after
midnight. Seas 6 to 8 ft.
.SAT...Variable winds less than 10 kt. Seas 6 to 9 ft.
.SAT NIGHT...SE winds less than 10 kt. Seas 7 to 9 ft.
.SUN...S winds less than 10 kt. Seas 7 to 9 ft.
.SUN NIGHT...S winds less than 10 kt. Seas 7 to 9 ft.
.MON...SE winds 10 kt. Seas 6 to 7 ft.
.MON NIGHT...SE winds less than 10 kt. Seas 5 to 6 ft.
.TUE...SE winds less than 10 kt. Seas 4 to 6 ft.
.TUE NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft.

ATLC waters S of 22N W of 65W

.TODAY...E winds 10 to 15 kt, diminishing to less than 10 kt in
the afternoon. Seas 3 to 5 ft.
.TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft.
.SAT...E winds less than 10 kt. Seas 4 to 6 ft.
.SAT NIGHT...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 4 to 6 ft.
.MON NIGHT...E winds 10 to 15 kt. Seas 4 to 6 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.

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

.TODAY...E winds 10 to 15 kt. Seas 6 to 7 ft.
.TONIGHT...SE winds 10 to 15 kt. Seas 6 to 7 ft.
.SAT...SE winds 10 to 15 kt. Seas 5 to 7 ft.
.SAT NIGHT...SE winds less than 10 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 6 to 7 ft.
.TUE...E winds 10 to 15 kt. Seas 6 to 7 ft.
.TUE NIGHT...E winds 10 to 15 kt. Seas 6 ft.