FZNT31 KNHC 190330
OFFN20

Marine Weather HF Voice Broadcast
NWS National Hurricane Center Miami, FL
1130 PM EDT Tue Mar 18 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 easterly trade winds will prevail
through the early next week in the central Caribbean. Building
ridge north of the area will result in an increase in areal
coverage of the winds Fri through the early next week.
Gale-force winds will pulse offshore Colombia at night on Sat
and Sun, along with rough to very rough seas. Fresh to near
gale-force winds will prevail in the central and portions of the
SW Caribbean during the weekend and through early next week. A
weak surface trough extends from Haiti to E Nicaragua. This
boundary is forecast to dissipate tonight into early Wed. The
aforementioned ridge north of the Caribbean will also sustain
fresh to strong NE winds in the lee of Cuba and the Windward
Passage tonight through Wed evening. Looking ahead, the tail of
a cold front will enter the NW Caribbean early Fri and dissipate
Fri evening. 

NW Caribbean W of 85W

.OVERNIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft. 
.WED...E winds 10 to 15 kt. Seas 4 to 5 ft. 
.WED NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. 
.THU...E winds 10 to 15 kt, diminishing to less than 10 kt in
the afternoon. Seas 3 to 4 ft. 
.THU NIGHT...NE winds less than 10 kt, increasing to 10 to 15 kt
after midnight. Seas 3 to 4 ft. 
.FRI...NE winds 10 to 15 kt. Seas 4 to 6 ft. 
.FRI NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. 
.SAT...E winds 10 to 15 kt. Seas 4 to 6 ft. 
.SAT NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. 
.SUN...E winds 10 to 20 kt. Seas 3 to 5 ft. 
.SUN NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. 

Caribbean N of 15N between 72W and 85W

.OVERNIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. 
.WED...E winds 10 to 15 kt. Seas 3 to 5 ft. 
.WED NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. 
.THU...S of 18N, E winds 10 to 15 kt. Elsewhere, E winds 10 to
15 kt, diminishing to less than 10 kt in the afternoon. Seas
3 to 4 ft. 
.THU NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. 
.FRI...NE winds 10 to 15 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 20 kt. Seas 5 to 7 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. 

Caribbean from 11N to 15N W of 72W

...GALE CONDITIONS POSSIBLE SAT AND SUN NIGHT...

.OVERNIGHT...NE winds 10 to 20 kt within 90 nm of coast of
Colombia, and NE 10 to 15 kt elsewhere. Seas 3 to 5 ft. 
.WED...NE winds 10 to 20 kt within 90 nm of coast of Colombia,
and NE 10 to 15 kt elsewhere. Seas 3 to 5 ft. 
.WED NIGHT...NE winds 15 to 25 kt within 90 nm of coast of
Colombia, and NE 10 to 20 kt elsewhere. Seas 4 to 6 ft. 
.THU...NE winds 15 to 25 kt within 90 nm of coast of Colombia,
and NE 10 to 20 kt elsewhere. Seas 4 to 6 ft. 
.THU NIGHT...NE winds 10 to 20 kt. Seas 5 to 7 ft. 
.FRI...NE winds 10 to 20 kt. Seas 5 to 7 ft. 
.FRI NIGHT...NE winds 10 to 20 kt. Seas 6 to 9 ft. 
.SAT...NE winds 15 to 25 kt. Seas 6 to 9 ft. 
.SAT NIGHT...NE winds 25 to 35 kt. Seas 8 to 11 ft. 
.SUN...E winds 15 to 25 kt. Seas 8 to 11 ft. 
.SUN NIGHT...E winds 25 to 35 kt. Seas 8 to 11 ft. 

SW Caribbean S of 11N

.OVERNIGHT...N winds 10 to 20 kt. Seas 3 to 5 ft. 
.WED...NE winds 10 to 20 kt. Seas 4 to 6 ft. 
.WED NIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. 
.THU...NE winds 10 to 20 kt. Seas 4 to 6 ft. 
.THU NIGHT...NE winds 10 to 20 kt. Seas 5 to 7 ft. 
.FRI...NE winds 10 to 20 kt. Seas 5 to 7 ft. 
.FRI NIGHT...NE winds 10 to 20 kt. Seas 6 to 8 ft. 
.SAT...NE winds 10 to 20 kt. Seas 7 to 10 ft. 
.SAT NIGHT...NE winds 10 to 20 kt. Seas 7 to 10 ft. 
.SUN...NE winds 10 to 20 kt. Seas 8 to 11 ft. 
.SUN NIGHT...NE winds 10 to 20 kt. Seas 8 to 11 ft. 

Caribbean between 64W and 72W

.OVERNIGHT...NE winds 10 to 20 kt Gulf of Venezuela, and NE less
than 10 kt elsewhere. Seas 3 to 4 ft. 
.WED...NE winds 10 to 15 kt. Seas 3 to 4 ft. 
.WED NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. 
.THU...E winds 10 to 15 kt. Seas 3 to 5 ft. 
.THU NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.FRI...E winds 10 to 20 kt. Seas 5 to 7 ft. 
.FRI NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. 
.SAT...E winds 10 to 20 kt. Seas 6 to 8 ft. 
.SAT NIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft. 
.SUN...E winds 10 to 20 kt. Seas 6 to 8 ft. 
.SUN 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

.OVERNIGHT...S winds less than 10 kt. Seas 4 to 6 ft. 
.WED...S winds 10 to 15 kt. Seas 4 to 6 ft. 
.WED NIGHT...S winds less than 10 kt. Seas 3 to 5 ft. 
.THU...SE winds less than 10 kt. Seas 5 to 7 ft. 
.THU NIGHT...E winds less than 10 kt. Seas 6 to 9 ft. 
.FRI...SE winds 10 to 15 kt. Seas 6 to 8 ft. 
.FRI NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. 
.SAT...E winds 10 to 15 kt. Seas 5 to 7 ft. 
.SAT NIGHT...E winds 10 to 20 kt. Seas 5 to 7 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. 

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

.OVERNIGHT...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 to 15 kt. Seas 4 to 6 ft. 
.THU...E winds 10 to 15 kt. Seas 4 to 6 ft. 
.THU NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. 
.FRI...E winds 10 to 15 kt. Seas 6 to 8 ft. 
.FRI NIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft. 
.SAT...E winds 10 to 20 kt. Seas 6 to 8 ft. 
.SAT NIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft. 
.SUN...E winds 10 to 20 kt. Seas 6 to 8 ft. 
.SUN NIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft. 

Synopsis for the the SW N Atlantic including the Bahamas

.SYNOPSIS...Recent ASCAT depict a large area of fresh to near
gale-force W-NW winds between Bermuda and the Bahamas associated
with an occluding 1000 mb low near 33N69W and cold front
extending from the low to northern Hispaniola. These winds are
producing rough to very rough seas. Also, fresh to strong S
winds and rough seas are found north of 20N and west of 42W in 
association with a a non-tropical low of 1006 mb near 28N57W. The
weaker system will open into a trough tonight and move N of the 
area. The strong low pressure will continue moving south over the
next day, supporting gale-force winds and very rough seas 
between Bermuda and the Bahamas tonight through Wed afternoon. 
Afterward, winds and seas will gradually diminish across the 
region through Thu night. Looking ahead, fresh to strong 
southerly winds will develop over the NE Florida offshore waters 
on Thu ahead of a strong cold front forecast to enter the NW 
offshore waters late Thu into Thu evening. Near gale-force NW 
winds will follow this front, which is forecast to reach from 
Bermuda to the central Bahamas late Fri. The front will move E of
the area on Sat, allowing high pressure to build the remaining 
weekend. 

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

.OVERNIGHT...N winds 10 to 15 kt. Seas 6 to 9 ft. 
.WED...N winds 10 to 15 kt. Seas 7 to 10 ft. 
.WED NIGHT...NW winds less than 10 kt. Seas 7 to 10 ft. 
.THU...SW winds 10 to 20 kt. Seas 6 to 9 ft. 
.THU NIGHT...W winds 20 to 30 kt. Seas 7 to 10 ft. 
.FRI...NW winds 20 to 25 kt, diminishing to 10 to 20 kt in the
afternoon. Seas 8 to 12 ft. 
.FRI NIGHT...N winds 10 to 15 kt, shifting to NW after midnight.
Seas 6 to 9 ft. 
.SAT...SW winds less than 10 kt, increasing to 10 to 15 kt in
the afternoon. Seas 4 to 6 ft. 
.SAT NIGHT...SW winds 10 to 15 kt, shifting to W after midnight.
Seas 3 to 4 ft. 
.SUN...SE winds less than 10 kt. Seas 3 to 4 ft. 
.SUN NIGHT...SE winds 10 to 15 kt. Seas 3 ft. 

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

...GALE WARNING...

.OVERNIGHT...NW winds 25 to 35 kt W of 70W, and W 20 to 30 kt
elsewhere. Seas 12 to 17 ft. 
.WED...NW winds 25 to 35 kt W of 70W, and NW 20 to 30 kt
elsewhere. Seas 15 to 20 ft. 
.WED NIGHT...NW winds 20 to 30 kt W of 70W, and NW 15 to 25 kt
elsewhere. Seas 12 to 17 ft. 
.THU...NW winds 10 to 20 kt. Seas 9 to 14 ft, subsiding to 8 to
11 ft in the afternoon. 
.THU NIGHT...W winds 10 to 20 kt. Seas 6 to 9 ft. 
.FRI...W winds 15 to 25 kt. Seas 8 to 11 ft. 
.FRI NIGHT...NW winds 15 to 25 kt. Seas 8 to 13 ft. 
.SAT...NW winds 10 to 15 kt, shifting to SW in the afternoon.
Seas 8 to 11 ft. 
.SAT NIGHT...SW winds 10 to 15 kt. Seas 6 to 9 ft. 
.SUN...NW winds less than 10 kt. Seas 5 to 7 ft. 
.SUN NIGHT...E winds less than 10 kt. Seas 3 to 5 ft. 

Bahamas N of 22N

.OVERNIGHT...N winds 10 to 20 kt. Seas 4 to 6 ft. 
.WED...N winds 10 to 15 kt. Seas 4 to 6 ft. 
.WED NIGHT...N winds less than 10 kt. Seas 6 to 8 ft. 
.THU...N winds less than 10 kt in the morning, becoming variable
winds less than 10 kt. Seas 5 to 7 ft. 
.THU NIGHT...W winds less than 10 kt, increasing to 10 to 15 kt
after midnight. Seas 3 to 5 ft. 
.FRI...NW winds 10 to 20 kt. Seas 3 to 5 ft. 
.FRI NIGHT...N winds 10 to 15 kt, shifting to NE after midnight.
Seas 3 to 5 ft. 
.SAT...E winds less than 10 kt. Seas 3 to 5 ft. 
.SAT NIGHT...E winds less than 10 kt. Seas 3 to 4 ft. 
.SUN...E winds less than 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 3 ft. 
.SUN NIGHT...E winds 10 to 15 kt. Seas 3 ft. 

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

...GALE WARNING...

.OVERNIGHT...NW winds 15 to 25 kt W of 70W, and NW 25 to 35 kt 
elsewhere. Seas 10 to 15 ft. 
.WED...NW winds 15 to 25 kt W of 70W, and W 25 to 35 kt 
elsewhere. Seas 13 to 18 ft. 
.WED NIGHT...NW winds 15 to 25 kt W of 70W, and NW 20 to 30 kt
elsewhere. Seas 13 to 18 ft. 
.THU...NW winds 10 to 20 kt. Seas 9 to 14 ft W of 70W, and 11 to
15 ft elsewhere. 
.THU NIGHT...W winds 10 to 15 kt. Seas 7 to 10 ft. 
.FRI...W winds 10 to 20 kt. Seas 6 to 8 ft. 
.FRI NIGHT...NW winds 10 to 20 kt. Seas 6 to 9 ft. 
.SAT...E winds less than 10 kt. Seas 6 to 8 ft. 
.SAT NIGHT...E winds less than 10 kt. Seas 5 to 7 ft. 
.SUN...E winds less than 10 kt. Seas 5 to 7 ft. 
.SUN NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. 

ATLC waters S of 22N W of 65W

.OVERNIGHT...NW winds 10 to 20 kt. Seas 6 to 8 ft. 
.WED...NW winds 10 to 15 kt. Seas 6 to 8 ft. 
.WED NIGHT...NW winds 10 to 20 kt. Seas 7 to 10 ft. 
.THU...NW winds 10 to 15 kt, diminishing to less than 10 kt in
the afternoon. Seas 7 to 10 ft. 
.THU NIGHT...N winds less than 10 kt. Seas 6 to 9 ft. 
.FRI...Variable winds less than 10 kt. Seas 4 to 6 ft. 
.FRI NIGHT...NE winds less than 10 kt. Seas 3 to 5 ft. 
.SAT...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. 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 4 to 6 ft. 

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

.OVERNIGHT...SW winds 10 to 15 kt. Seas 6 to 7 ft. 
.WED...SW winds 10 to 15 kt. Seas 6 to 8 ft. 
.WED NIGHT...SW winds 10 to 15 kt. Seas 6 to 9 ft. 
.THU...SW winds 10 to 15 kt. Seas 8 to 11 ft. 
.THU NIGHT...W winds 10 to 15 kt, diminishing to less than 10 kt
after midnight. Seas 8 to 11 ft. 
.FRI...S winds less than 10 kt. Seas 7 to 10 ft. 
.FRI NIGHT...Variable winds less than 10 kt, becoming E less
than 10 kt after midnight. Seas 6 to 8 ft. 
.SAT...E winds less than 10 kt. Seas 5 to 7 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 5 to 7 ft.