543
FZNT31 KNHC 210319
OFFN20

Marine Weather HF Voice Broadcast
NWS National Hurricane Center Miami, FL
1119 PM EDT Wed Aug 20 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 locally strong trades and moderate seas
seas will exist over the central and eastern Caribbean tonight
through Fri as a strengthening pressure gradient develops
between low pressure over Colombia and building high pressure in
the wake of Hurricane Erin in the western Atlantic. Elsewhere,
fresh to occasionally strong east to southeast winds will pulse
in the Gulf of Honduras beginning on Thu. Long period northwest
to north swell from Hurricane Erin will begin to impact the
Tropical N Atlantic zones from late on Fri through Mon. Looking
ahead, a tropical wave located several hundred miles east of the
Leeward Islands is producing a broad area of disorganized
showers and thunderstorms. Environmental conditions appear
conducive for gradual development of this system, and a tropical
depression is likely to form by this weekend while it moves near
or to the north of the northern Leeward Islands.

NW Caribbean W of 85W

.OVERNIGHT...SE winds 10 to 15 kt. Seas 2 ft or less.
.THU...SE winds 10 to 15 kt. Seas 2 ft or less.
.THU NIGHT...E winds 10 to 20 kt. Seas 2 ft or less.
.FRI...SE winds 10 to 20 kt. Seas 2 ft or less.
.FRI NIGHT...E winds 15 to 25 kt. Seas 3 to 5 ft.
.SAT...E winds 10 to 20 kt. Seas 3 to 5 ft.
.SAT NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft.
.SUN...E winds 10 to 20 kt. Seas 3 to 5 ft.
.SUN NIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft.
.MON...E winds 10 to 20 kt. Seas 3 to 4 ft.

Caribbean N of 15N between 72W and 85W

.OVERNIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft S of 18N, and
2 ft or less elsewhere.
.THU...E winds 10 to 20 kt. S of 18N, seas 3 to 5 ft. Elsewhere,
seas 2 to 3 ft.
.THU NIGHT...E winds 10 to 20 kt. S of 18N, seas 3 to 5 ft.
Elsewhere, seas 2 to 3 ft.
.FRI...E winds 10 to 20 kt. Seas 3 to 5 ft S of 18N, and 2 ft or
less elsewhere.
.FRI NIGHT...E winds 10 to 20 kt. S of 18N, seas 3 to 5 ft.
Elsewhere, seas 2 to 3 ft.
.SAT...E winds 10 to 20 kt. Seas 3 to 5 ft.
.SAT NIGHT...E winds 10 to 20 kt. S of 18N, seas 3 to 5 ft.
Elsewhere, seas 2 to 3 ft.
.SUN...E winds 10 to 20 kt. Seas 3 to 5 ft S of 18N, and 2 to 3
ft elsewhere.
.SUN NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft S of 18N, and
2 ft or less elsewhere.
.MON...E winds 10 to 20 kt. Seas 4 to 6 ft S of 18N, and 3 ft
elsewhere.

Caribbean from 11N to 15N W of 72W

.OVERNIGHT...NE winds 15 to 25 kt. Seas 6 to 7 ft within 90 nm
of coast of Colombia, and 3 to 5 ft elsewhere.
.THU...E winds 15 to 25 kt. Seas 4 to 6 ft.
.THU NIGHT...E winds 15 to 25 kt. Seas 4 to 6 ft.
.FRI...E winds 15 to 25 kt. Seas 5 to 7 ft.
.FRI NIGHT...NE winds 10 to 20 kt within 90 nm of coast of
Colombia, and E 15 to 25 kt elsewhere. Seas 4 to 6 ft.
.SAT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.SAT NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.SUN...E winds 15 to 25 kt. Seas 4 to 6 ft.
.SUN NIGHT...E winds 15 to 25 kt. Seas 4 to 6 ft.
.MON...E winds 15 to 25 kt. Seas 4 to 6 ft.

SW Caribbean S of 11N

.OVERNIGHT...N winds 10 to 20 kt. Seas 3 to 4 ft.
.THU...NE winds 10 to 20 kt. Seas 3 to 4 ft.
.THU NIGHT...NW winds less than 10 kt. Seas 3 to 5 ft.
.FRI...S winds 10 to 15 kt. Seas 3 to 5 ft.
.FRI NIGHT...W winds 10 to 20 kt. Seas 3 to 5 ft.
.SAT...S winds 10 to 20 kt. Seas 3 to 5 ft.
.SAT NIGHT...SW winds 10 to 15 kt. Seas 3 to 5 ft.
.SUN...SW winds 10 to 15 kt. Seas 3 to 5 ft.
.SUN NIGHT...NW winds 10 to 15 kt. Seas 3 to 5 ft.
.MON...W to NW winds 10 to 15 kt. Seas 3 to 5 ft.

Caribbean between 64W and 72W

.OVERNIGHT...E winds 15 to 25 kt. Seas 5 to 7 ft.
.THU...E winds 15 to 25 kt. Seas 5 to 7 ft.
.THU NIGHT...NE winds 15 to 25 kt Gulf of Venezuela, and E 10 to
20 kt elsewhere. Seas 4 to 6 ft.
.FRI...E winds 15 to 25 kt Gulf of Venezuela, and E 10 to 20 kt
elsewhere. Seas 3 to 4 ft Gulf of Venezuela, and 4 to 6 ft
elsewhere.
.FRI NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft.
.SAT...E winds 10 to 20 kt. Seas 3 to 5 ft.
.SAT NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft.
.SUN...E winds 15 to 25 kt. Seas 4 to 6 ft.
.SUN NIGHT...E winds 20 to 30 kt Gulf of Venezuela, and E 15 to
25 kt elsewhere. Seas 4 to 6 ft.
.MON...E winds 15 to 25 kt. Seas 3 to 5 ft Gulf of Venezuela,
and 5 to 7 ft elsewhere.

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

.OVERNIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft.
.THU...E winds 10 to 20 kt. Seas 5 to 7 ft.
.THU NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.FRI...SE winds 10 to 20 kt. Seas 4 to 6 ft.
.FRI NIGHT...SE winds 10 to 20 kt. Seas 4 to 6 ft.
.SAT...SE winds 10 to 20 kt. Seas 4 to 6 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 6 to 8 ft.
.MON...E winds 10 to 20 kt. Seas 6 to 8 ft.

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

.OVERNIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.THU...SE winds 10 to 15 kt. Seas 4 to 6 ft.
.THU NIGHT...SE winds 10 to 20 kt. Seas 3 to 5 ft.
.FRI...SE winds 10 to 20 kt. Seas 3 to 5 ft.
.FRI NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.SAT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.SAT NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.SUN...E winds 10 to 20 kt. Seas 4 to 6 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.

Synopsis for the the SW N Atlantic including the Bahamas

.SYNOPSIS...Hurricane Erin is centered north of the area near
32.8N 73.1W, or about 420 nm west of Bermuda at 11 PM EDT, and
is moving north at 14 kt. Maximum sustained winds are 95 kt with
gusts to 115 kt, and the minimum central pressure is 942 mb.
Erin will continue to pull NNE far away from the region through
the end of the week while slowly weakening. Long period northerly
swells generated by Erin will affect just about the entire
forecast domain 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 through the period. Looking
ahead, a tropical wave located several hundred miles east of the
Leeward Islands is producing a broad area of disorganized showers
and thunderstorms. Environmental conditions appear conducive for
gradual development of this system, and a tropical depression is
likely to form by this weekend while it moves near or to the
north of the northern Leeward Islands.

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

.OVERNIGHT...NW winds 15 to 25 kt. Seas 12 to 17 ft.
.THU...W winds 10 to 20 kt. Seas 10 to 15 ft, subsiding to 8 to
12 ft in the afternoon.
.THU NIGHT...SW to W winds 10 to 15 kt. Seas 7 to 10 ft.
.FRI...W winds less than 10 kt. Seas 6 to 8 ft.
.FRI NIGHT...S winds less than 10 kt. Seas 6 to 8 ft.
.SAT...SW 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 6 ft.

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

...TROPICAL STORM WARNING...

.OVERNIGHT...TROPICAL STORM CONDITIONS. SW winds 40 to 50 kt W
of 70W, and S 25 to 35 kt elsewhere. Seas 17 to 27 ft W of 70W,
and 13 to 18 ft elsewhere.
.THU...SW winds 20 to 30 kt. W of 70W, seas 15 to 20 ft,
subsiding to 12 to 17 ft in the afternoon. Elsewhere, seas 12 to
17 ft.
.THU NIGHT...W of 70W, W winds 20 to 30 kt, diminishing to 10 to
20 kt after midnight. Elsewhere, SW winds 20 to 30 kt. Seas
10 to 15 ft.
.FRI...W winds 10 to 20 kt W of 70W, and SW 15 to 25 kt
elsewhere. Seas 8 to 13 ft.
.FRI NIGHT...NW winds less than 10 kt W of 70W, and W 10 to
20 kt elsewhere. Seas 8 to 12 ft.
.SAT...S winds less than 10 kt. Seas 8 to 12 ft.
.SAT NIGHT...W of 70W, S winds less than 10 kt. Elsewhere, SE
winds 10 to 15 kt. Seas 8 to 11 ft.
.SUN...S winds 10 to 20 kt. Seas 6 to 9 ft W of 70W, and 8 to
11 ft elsewhere.
.SUN NIGHT...SW winds 10 to 15 kt W of 70W, and S 15 to 25 kt
elsewhere. Seas 6 to 9 ft W of 70W, and 8 to 11 ft elsewhere.
.MON...SW winds 10 to 15 kt W of 70W, and SW 20 to 30 kt
elsewhere. Seas 6 to 9 ft W of 70W, and 8 to 11 ft elsewhere.

Bahamas N of 22N

.OVERNIGHT...SW winds 10 to 15 kt. Seas 5 to 7 ft.
.THU...SW winds 10 to 15 kt. Seas 4 to 6 ft.
.THU NIGHT...W winds 10 to 15 kt, shifting to S after midnight.
Seas 3 to 5 ft.
.FRI...SW winds less than 10 kt. Seas 3 to 4 ft.
.FRI NIGHT...N winds less than 10 kt, shifting to E after
midnight. Seas 3 to 5 ft.
.SAT...SE winds 10 to 15 kt. Seas 3 to 5 ft.
.SAT NIGHT...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 10 to 15 kt. Seas 3 to 5 ft.
.MON...SE winds 10 to 15 kt. Seas 3 to 4 ft.

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

.OVERNIGHT...S winds 15 to 25 kt W of 70W, and S 10 to 20 kt
elsewhere. Seas 8 to 13 ft W of 70W, and 7 to 10 ft elsewhere.
.THU...S winds 10 to 20 kt. Seas 7 to 10 ft.
.THU NIGHT...S winds 10 to 20 kt. Seas 6 to 9 ft.
.FRI...S winds 10 to 15 kt. Seas 6 to 8 ft.
.FRI NIGHT...W of 70W, W winds less than 10 kt, shifting to S
after midnight. Elsewhere, N to NE winds less than 10 kt.
Seas 6 to 9 ft.
.SAT...S winds less than 10 kt W of 70W, and NE 10 to 15 kt
elsewhere. Seas 7 to 10 ft.
.SAT NIGHT...W of 70W, S winds less than 10 kt. Elsewhere, N
winds 10 to 15 kt, increasing to 15 to 25 kt after midnight.
Seas 7 to 8 ft W of 70W, and 8 to 11 ft elsewhere.
.SUN...W of 70W, S winds less than 10 kt. Elsewhere, N winds
20 to 30 kt, shifting to SW in the afternoon. Seas 6 to 8 ft W
of 70W, and 8 to 11 ft elsewhere.
.SUN NIGHT...S winds less than 10 kt W of 70W, and SW 20 to
30 kt elsewhere. Seas 7 to 10 ft.
.MON...S winds less than 10 kt W of 70W, and S 15 to 25 kt
elsewhere. Seas 6 to 8 ft W of 70W, and 8 to 11 ft elsewhere.

ATLC waters S of 22N W of 65W

.OVERNIGHT...SE winds 10 to 20 kt. Seas 3 to 5 ft.
.THU...SE winds 10 to 20 kt. Seas 3 to 5 ft.
.THU NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft.
.FRI...E winds 10 to 20 kt. Seas 3 to 5 ft.
.FRI NIGHT...NE 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 4 to 6 ft.
.SUN...SE winds 10 to 20 kt. Seas 5 to 7 ft.
.SUN NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft.
.MON...E winds 10 to 20 kt. Seas 4 to 6 ft.

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

.OVERNIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft.
.THU...E winds 10 to 20 kt. Seas 5 to 7 ft.
.THU NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft.
.FRI...E winds 15 to 25 kt. Seas 6 to 7 ft.
.FRI NIGHT...SE winds 20 to 30 kt. Seas 6 to 7 ft.
.SAT...SE winds 20 to 30 kt. Seas 6 to 9 ft.
.SAT NIGHT...SE winds 10 to 20 kt. Seas 6 to 9 ft.
.SUN...E winds 10 to 20 kt. Seas 6 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.