000
FZNT31 KNHC 280913
OFFN20

Marine Weather HF Voice Broadcast
NWS National Hurricane Center Miami, FL
513 AM EDT Tue Sep 28 2021

Marine Weather HF Voice Broadcast for the Tropical N Atlantic
from 07N to 22N between 55W and 64W, the SW N Atlantic S of
31N W of 65W including 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 between 55W and 64W

.SYNOPSIS...Hurricane Sam was near 17.2N 53.9W 953 mb at 5 AM
EDT moving NW at 8 kt. Maximum sustained winds 115 kt gusts
140 kt. Sam will move to 17.9N 54.7W this afternoon, 18.8N 55.9W
Wed morning, 19.9N 57.4W Wed afternoon, 21.3N 59.0W Thu morning,
23.2N 60.5W Thu afternoon, and 25.6N 61.5W Fri morning. Sam will
change little in intensity as it moves north of the area early
Sat. Meanwhile, moderate trades will continue over much of the
Caribbean today. Gentle trades will then prevail over the
Caribbean through Fri. Swells generated by Sam are forecast to
continue off the Leeward Islands through the middle of the week.

NW Caribbean W of 85W

.TODAY...E winds 10 to 15 kt. Seas 3 ft. 
.TONIGHT...E winds 10 to 15 kt. Seas 3 ft. 
.WED...E winds less than 10 kt. Seas 3 ft in the morning,
subsiding to 2 ft or less. 
.WED NIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to
3 ft after midnight. 
.THU...E winds 10 to 15 kt. Seas 3 ft. 
.THU NIGHT...E winds 10 to 15 kt. Seas 3 ft. 
.FRI...E winds 10 to 15 kt. Seas 3 ft. 
.FRI NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. 
.SAT...E winds 10 to 15 kt. Seas 3 to 4 ft. 

Caribbean N of 15N between 72W and 85W

.TODAY...NE winds 10 to 15 kt. Seas 3 ft in the morning,
subsiding to 2 ft or less. 
.TONIGHT...E winds 10 to 15 kt. Seas 2 ft or less. 
.WED...E winds 10 to 15 kt S of 18N, and E less than 10 kt
elsewhere. Seas 2 ft or less. 
.WED NIGHT...S of 18N, E winds 10 to 15 kt, diminishing to less
than 10 kt after midnight. Elsewhere, NE winds 10 to 15 kt. Seas
2 ft or less. 
.THU...S of 18N, E winds less than 10 kt, increasing to 10 to
15 kt in the afternoon. Elsewhere, E winds 10 to 15 kt. Seas
2 ft or less. 
.THU NIGHT...E winds less than 10 kt S of 18N, and NE 10 to
20 kt elsewhere. Seas 2 ft or less. 
.FRI...E winds 10 to 15 kt. Seas 2 ft or less. 
.FRI NIGHT...E winds 10 to 20 kt. Seas 2 ft or less, building to
3 to 4 ft after midnight. 
.SAT...E winds 10 to 20 kt. Seas 3 to 4 ft. 

Caribbean from 11N to 15N W of 72W

.TODAY...NE winds 10 to 20 kt. Seas 3 to 5 ft. 
.TONIGHT...NE winds 10 to 20 kt. Seas 3 to 4 ft. 
.WED...E winds 10 to 15 kt. Seas 3 ft. 
.WED NIGHT...NE winds less than 10 kt. Seas 3 ft. 
.THU...Within 90 nm of coast of Colombia, E winds less than
10 kt. Elsewhere, NE winds less than 10 kt, shifting to E in the
afternoon. Seas 3 ft. 
.THU NIGHT...E winds less than 10 kt. Seas 3 ft. 
.FRI...E winds less than 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 3 ft. 
.FRI NIGHT...E winds 10 to 15 kt. Seas 3 ft. 
.SAT...E winds 10 to 20 kt. Seas 3 to 4 ft. 

SW Caribbean S of 11N

.TODAY...NE winds 10 to 20 kt. Seas 3 to 5 ft. 
.TONIGHT...N winds 10 to 15 kt, shifting to NW after midnight.
Seas 3 to 4 ft. 
.WED...NW winds less than 10 kt, increasing to 10 to 15 kt in
the afternoon. Seas 3 ft. 
.WED NIGHT...W winds less than 10 kt. Seas 3 ft in the evening,
subsiding to 2 ft or less. 
.THU...W winds less than 10 kt. Seas 2 ft or less. 
.THU NIGHT...W winds less than 10 kt. Seas 2 ft or less. 
.FRI...S winds less than 10 kt. Seas 2 ft or less. 
.FRI NIGHT...Variable winds less than 10 kt. Seas 2 ft or less. 
.SAT...Variable winds less than 10 kt, becoming NW less than
10 kt in the afternoon. Seas 2 ft or less. 

Caribbean between 64W and 72W

.TODAY...E winds 10 to 20 kt. Seas 3 to 4 ft. 
.TONIGHT...E winds 10 to 20 kt. Seas 3 ft. 
.WED...Gulf of Venezuela, E winds 10 to 15 kt, shifting to SW in
the afternoon. Elsewhere, E winds 10 to 15 kt. Seas 3 ft. 
.WED NIGHT...Gulf of Venezuela, NE winds less than 10 kt,
shifting to SE after midnight. Elsewhere, E winds 10 to 15 kt.
Seas 3 ft. 
.THU...Gulf of Venezuela, E winds less than 10 kt in the
morning, becoming variable winds less than 10 kt. Elsewhere, E
winds 10 to 15 kt, diminishing to less than 10 kt in the
afternoon. Seas 3 ft. 
.THU NIGHT...E winds 10 to 15 kt. Seas 3 ft. 
.FRI...NE winds less than 10 kt Gulf of Venezuela, and E 10 to
15 kt elsewhere. Seas 2 ft or less Gulf of Venezuela, and 3 to
4 ft elsewhere. 
.FRI NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. 
.SAT...E winds 10 to 20 kt. Seas 2 ft or less Gulf of Venezuela,
and 3 to 5 ft elsewhere. 

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

...HURRICANE WARNING...

.TODAY...TROPICAL STORM CONDITIONS. NE winds 30 to 40 kt,
increasing to 60 to 70 kt in the afternoon. Seas 7 to 10 ft. 
.TONIGHT...HURRICANE CONDITIONS EXPECTED. N winds 90 to 110 kt.
Seas 8 to 11 ft. 
.WED...TROPICAL STORM CONDITIONS EXPECTED. N winds 90 to
100 kt, becoming W 35 to 45 kt in the afternoon. Seas 8 to
11 ft. 
.WED NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. SW winds 20 to
30 kt. Seas 6 to 9 ft. 
.THU...S winds 15 to 25 kt, shifting to SE 10 to 15 kt in the
afternoon. Seas 6 to 9 ft. 
.THU NIGHT...SE winds 10 to 15 kt. Seas 5 to 7 ft. 
.FRI...E winds 10 to 15 kt. Seas 4 to 6 ft. 
.FRI NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. 
.SAT...E winds 10 to 20 kt. Seas 5 to 7 ft. 

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

.TODAY...SE winds 10 to 20 kt. Seas 4 to 6 ft. 
.TONIGHT...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. 
.THU...E winds 10 to 15 kt. Seas 4 to 6 ft. 
.THU NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.FRI...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.FRI NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. 
.SAT...E winds 10 to 20 kt. Seas 5 to 7 ft. 

Synopsis for the the SW N Atlantic including the Bahamas

.SYNOPSIS...A stationary front extends from 31N65W to the 
northern Bahamas and is expected to dissipate this morning.
Light to gentle breezes are expected to prevail with slight seas
through Thu west of 65W. Meanwhile, Hurricane Sam was near 17.2N
53.9W 953 mb at 5 AM EDT moving NW at 8 kt. Maximum sustained 
winds 115 kt gusts 140 kt. Sam will change little in intensity as
it moves north of the area by early Sat, staying east of 
Bermuda. At a minimum, expect rough seas in the outer swell from 
Sam from mid to late week, reaching as far west as 70W by Thu. 

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

.TODAY...NE winds less than 10 kt. Seas 3 ft. 
.TONIGHT...E winds less than 10 kt. Seas 3 ft. 
.WED...N winds less than 10 kt. Seas 3 ft. 
.WED NIGHT...NE winds 10 to 15 kt. Seas 3 ft. 
.THU...NE winds 10 to 15 kt. Seas 3 to 4 ft. 
.THU NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. 
.FRI...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.FRI NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. 
.SAT...E winds 10 to 20 kt. Seas 5 to 7 ft. 

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

.TODAY...NE winds 10 to 15 kt W of 70W, and E less than 10 kt
elsewhere. Seas 3 to 4 ft. 
.TONIGHT...W of 70W, NE winds 10 to 15 kt, diminishing to less
than 10 kt after midnight. Elsewhere, SE winds less than 10 kt.
Seas 3 to 4 ft. 
.WED...NE winds less than 10 kt. Seas 3 to 5 ft. 
.WED NIGHT...NE winds 10 to 15 kt W of 70W, and E less than
10 kt elsewhere. Seas 4 to 6 ft. 
.THU...NE winds 10 to 15 kt. Seas 4 to 6 ft. 
.THU NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.FRI...HURRICANE CONDITIONS POSSIBLE. 
.FRI NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.SAT...NE winds 10 to 20 kt. W of 70W, seas 7 to 10 ft.
Elsewhere, seas 9 to 13 ft, subsiding to 7 to 10 ft in the
afternoon. 

Bahamas N of 22N

.TODAY...NE winds 10 to 15 kt. Seas 3 ft in the morning,
subsiding to 2 ft or less. 
.TONIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. 
.WED...NE winds less than 10 kt, increasing to 10 to 15 kt in
the afternoon. Seas 2 ft or less. 
.WED NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less, building
to 3 ft after midnight. 
.THU...NE winds 10 to 15 kt. Seas 3 ft. 
.THU NIGHT...NE winds 10 to 20 kt. Seas 3 to 4 ft. 
.FRI...NE winds 10 to 20 kt. Seas 3 to 5 ft. 
.FRI NIGHT...NE winds 10 to 20 kt. Seas 3 to 5 ft. 
.SAT...NE winds 10 to 20 kt. Seas 4 to 6 ft. 

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

.TODAY...W of 70W, E winds less than 10 kt, shifting to NE in
the afternoon. Elsewhere, SE winds less than 10 kt. Seas 3 to
4 ft. 
.TONIGHT...W of 70W, NE winds 10 to 15 kt, shifting to E after
midnight. Elsewhere, SE winds less than 10 kt. Seas 3 to 5 ft. 
.WED...W of 70W, E winds less than 10 kt, shifting to NE in the
afternoon. Elsewhere, S winds less than 10 kt. Seas 4 to 5 ft. 
.WED NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. 
.THU...NE winds 10 to 15 kt. Seas 4 to 5 ft W of 70W, and 6 to
8 ft elsewhere. 
.THU NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.FRI...TROPICAL STORM CONDITIONS POSSIBLE. 
.FRI NIGHT...NE winds 10 to 20 kt. Seas 8 to 11 ft. 
.SAT...NE winds 10 to 20 kt. Seas 6 to 9 ft. 

ATLC waters S of 22N W of 65W

.TODAY...E winds less than 10 kt. Seas 3 ft. 
.TONIGHT...E winds 10 to 15 kt, diminishing to less than 10 kt
after midnight. Seas 3 to 5 ft. 
.WED...E winds less than 10 kt. Seas 3 to 4 ft. 
.WED NIGHT...E winds less than 10 kt, increasing to 10 to 15 kt
after midnight. Seas 4 to 6 ft. 
.THU...E winds 10 to 15 kt. Seas 5 to 7 ft. 
.THU NIGHT...NE winds 10 to 15 kt. Seas 6 to 8 ft. 
.FRI...E winds 10 to 15 kt. Seas 6 to 8 ft. 
.FRI NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. 
.SAT...E winds 10 to 15 kt. Seas 4 to 6 ft. 

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

...HURRICANE WARNING...

.TODAY...TROPICAL STORM CONDITIONS POSSIBLE. E winds 15 to
25 kt, increasing to 30 to 40 kt in the afternoon. Seas 7 to
10 ft. 
.TONIGHT...TROPICAL STORM CONDITIONS EXPECTED. E winds 45 to
55 kt, becoming NE 80 to 100 kt after midnight. Seas 8 to 11 ft,
building to 9 to 14 ft after midnight. 
.WED...HURRICANE CONDITIONS EXPECTED. NE winds 90 to 110 kt.
Seas 12 to 17 ft. 
.WED NIGHT...HURRICANE CONDITIONS EXPECTED. N winds 90 to
110 kt. Seas 14 to 19 ft. 
.THU...HURRICANE CONDITIONS POSSIBLE. W winds 90 to 110 kt,
diminishing to 45 to 55 kt in the afternoon. Seas 11 to 16 ft. 
.THU NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.FRI...SE winds 10 to 20 kt. Seas 7 to 10 ft. 
.FRI NIGHT...SE winds 10 to 15 kt. Seas 6 to 9 ft. 
.SAT...SE winds 10 to 15 kt. Seas 6 to 7 ft.