000
FZNT31 KNHC 190913
OFFN20

Marine Weather HF Voice Broadcast
NWS National Hurricane Center Miami, FL
513 AM EDT Thu Oct 19 2023

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...Tropical Storm Tammy is near 13.5N 54.8W at 5 AM
EDT, and is moving west at 15 kt. Maximum sustained winds are
35 kt with gusts to 45 kt, and the minimum central pressure is
1006 mb. Tammy will move to 13.9N 56.4W this afternoon, 14.5N
58.2W Fri morning, 15.5N 60.0W Fri afternoon, 16.8N 61.3W Sat
morning, 18.4N 62.4W Sat afternoon, and 19.9N 63.1W Sun morning.
Tammy will strengthen to a hurricane near 23.3N 63.0W early Mon.
A weakening stationary front extending from eastern Cuba to the 
Gulf of Honduras will dissipate later today. Fresh to locally 
strong trade winds over the central and portions of the SW basin 
will diminish tonight. Fresh to locally strong winds associated 
with Tammy will start affecting the NE Caribbean waters this 
evening. 

NW Caribbean W of 85W

.TODAY...NE winds 10 to 20 kt. Seas 4 to 6 ft. 
.TONIGHT...N winds 10 to 15 kt. Seas 3 to 4 ft. 
.FRI...N winds 10 to 15 kt. Seas 3 to 4 ft. 
.FRI NIGHT...N winds 10 to 20 kt. Seas 3 to 4 ft. 
.SAT...N winds 10 to 15 kt. Seas 3 to 4 ft. 
.SAT NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. 
.SUN...NE winds 10 to 15 kt. Seas 3 ft. 
.SUN NIGHT...NE winds 10 to 15 kt. Seas 3 ft. 
.MON...NE winds 10 to 15 kt. Seas 3 to 4 ft. 

Caribbean N of 15N between 72W and 85W

.TODAY...E winds 10 to 20 kt. Seas 3 to 5 ft. 
.TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft S of 18N, and
2 ft or less elsewhere. 
.FRI...NE winds 10 to 15 kt. Seas 3 ft. 
.FRI NIGHT...N winds 10 to 15 kt. Seas 2 ft or less. 
.SAT...NE winds 10 to 20 kt. Seas 2 ft or less, building to 3 ft
in the afternoon. 
.SAT NIGHT...S of 18N, NE winds 10 to 15 kt, diminishing to less
than 10 kt after midnight. Elsewhere, NE winds 10 to 15 kt. Seas
3 ft. 
.SUN...NE winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft
in the afternoon. 
.SUN NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. 
.MON...E winds 10 to 15 kt. Seas 3 ft. 

Caribbean from 11N to 15N W of 72W

.TODAY...E winds 15 to 25 kt. Seas 3 to 5 ft. 
.TONIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.FRI...Within 90 nm of coast of Colombia, SE 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. 
.FRI NIGHT...Within 90 nm of coast of Colombia, NE winds less
than 10 kt, shifting to SE after midnight. Elsewhere, NE winds
10 to 15 kt. Seas 3 ft. 
.SAT...Within 90 nm of coast of Colombia, S winds 10 to 15 kt,
shifting to SW in the afternoon. Elsewhere, E winds 10 to 15 kt.
Seas 3 ft. 
.SAT NIGHT...Within 90 nm of coast of Colombia, NW winds less
than 10 kt in the evening, becoming variable winds less than
10 kt. Elsewhere, NE winds 10 to 15 kt, diminishing to less than
10 kt after midnight. Seas 3 ft. 
.SUN...Variable winds less than 10 kt within 90 nm of coast of
Colombia, and E 10 to 15 kt elsewhere. Seas 3 ft. 
.SUN NIGHT...Within 90 nm of coast of Colombia, NE winds less
than 10 kt. Elsewhere, E winds 10 to 15 kt, diminishing to less
than 10 kt after midnight. Seas 3 ft. 
.MON...E winds 10 to 15 kt. Seas 3 ft. 

SW Caribbean S of 11N

.TODAY...NE winds 10 to 20 kt, shifting to SW in the afternoon.
Seas 3 to 5 ft. 
.TONIGHT...NW winds 10 to 15 kt. Seas 3 to 5 ft. 
.FRI...W winds less than 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 3 to 4 ft. 
.FRI NIGHT...W winds 10 to 15 kt. Seas 3 ft. 
.SAT...SW winds 10 to 15 kt. Seas 3 ft in the morning, subsiding
to 2 ft or less. 
.SAT NIGHT...W winds 10 to 15 kt, diminishing to less than 10 kt
after midnight. Seas 2 ft or less. 
.SUN...S winds less than 10 kt. Seas 2 ft or less. 
.SUN NIGHT...SW winds less than 10 kt. Seas 2 ft or less. 
.MON...SE winds less than 10 kt. Seas 2 ft or less. 

Caribbean between 64W and 72W

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

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

...TROPICAL STORM WARNING...

.TODAY...TROPICAL STORM CONDITIONS EXPECTED. E winds 25 to
35 kt. Seas 6 to 9 ft. 
.TONIGHT...TROPICAL STORM CONDITIONS EXPECTED. E winds 35 to
45 kt. Seas 7 to 10 ft. 
.FRI...TROPICAL STORM CONDITIONS EXPECTED. E winds 40 to 50 kt.
Seas 8 to 13 ft. 
.FRI NIGHT...TROPICAL STORM CONDITIONS EXPECTED. E winds 45 to
55 kt. Seas 9 to 14 ft. 
.SAT...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 45 to
55 kt. Seas 8 to 13 ft. 
.SAT NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.SUN...TROPICAL STORM CONDITIONS POSSIBLE. 
.SUN NIGHT...SE winds 10 to 20 kt. Seas 6 to 8 ft. 
.MON...SE winds 10 to 15 kt. Seas 4 to 6 ft. 

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

...TROPICAL STORM WARNING...

.TODAY...TROPICAL STORM CONDITIONS. E winds 30 to 40 kt. Seas
5 to 7 ft. 
.TONIGHT...TROPICAL STORM CONDITIONS EXPECTED. E winds 40 to
50 kt. Seas 7 to 10 ft. 
.FRI...TROPICAL STORM CONDITIONS EXPECTED. SE winds 40 to
50 kt, diminishing to 30 to 40 kt in the afternoon. Seas 6 to
9 ft. 
.FRI NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 20 to
30 kt. Seas 6 to 9 ft. 
.SAT...SE winds 15 to 25 kt. Seas 6 to 8 ft. 
.SAT NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. 
.SUN...E winds 10 to 20 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. 

Synopsis for the the SW N Atlantic including the Bahamas

.SYNOPSIS...Tropical Storm Tammy is near 13.5N 54.8W at 5 AM 
EDT, and is moving west at 15 kt. Maximum sustained winds are
35 kt with gusts to 45 kt, and the minimum central pressure is
1006 mb. Tammy will move to 13.9N 56.4W this afternoon, 14.5N
58.2W Fri morning, 15.5N 60.0W Fri afternoon, 16.8N 61.3W Sat
morning, 18.4N 62.4W Sat afternoon, and 19.9N 63.1W Sun morning.
Tammy will strengthen to a hurricane near 23.3N 63.0W early Mon.
A stationary front extending from 31N63W to eastern Cuba will
weaken today before dissipating. High pressure will build over 
the area in the wake of the front. The next frontal system will 
move offshore the southeastern United States Fri night. Fresh to
strong winds and rough seas are forecast north of 27N Fri night 
through Sat night with this system. 

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

.TODAY...NE winds less than 10 kt, increasing to 10 to 15 kt in
the afternoon. Seas 3 ft. 
.TONIGHT...N winds 10 to 15 kt, shifting to NW after midnight.
Seas 3 to 4 ft. 
.FRI...NW winds 10 to 15 kt. Seas 3 to 4 ft. 
.FRI NIGHT...W winds 10 to 20 kt, increasing to 20 to 30 kt
after midnight. Seas 4 to 6 ft. 
.SAT...W winds 15 to 25 kt. Seas 4 to 6 ft. 
.SAT NIGHT...W winds 10 to 20 kt. Seas 4 to 6 ft. 
.SUN...W winds 10 to 20 kt. Seas 3 to 5 ft. 
.SUN NIGHT...NW winds 10 to 15 kt. Seas 3 to 5 ft. 
.MON...NE winds 10 to 15 kt. Seas 3 to 5 ft. 

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

.TODAY...E winds 10 to 20 kt. Seas 3 to 5 ft. 
.TONIGHT...SE winds 10 to 20 kt W of 70W, and SE 15 to 25 kt
elsewhere. Seas 4 to 6 ft. 
.FRI...W of 70W, S winds 10 to 15 kt, shifting to SW 15 to 25 kt
in the afternoon. Elsewhere, SE winds 10 to 20 kt. Seas 4 to
6 ft. 
.FRI NIGHT...SW winds 15 to 25 kt. Seas 5 to 7 ft. 
.SAT...W winds 15 to 25 kt W of 70W, and SW 20 to 30 kt
elsewhere. Seas 6 to 8 ft. 
.SAT NIGHT...W winds 10 to 20 kt W of 70W, and W 15 to 25 kt
elsewhere. Seas 6 to 8 ft. 
.SUN...W winds 10 to 20 kt. Seas 5 to 7 ft. 
.SUN NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. W of 70W, NW
winds 10 to 15 kt. Elsewhere, NW winds 10 to 15 kt, diminishing
to less than 10 kt after midnight. 
.MON...TROPICAL STORM CONDITIONS POSSIBLE. 

Bahamas N of 22N

.TODAY...E winds 10 to 20 kt. Seas 3 ft. 
.TONIGHT...E winds 10 to 20 kt. Seas 2 ft or less. 
.FRI...S winds 10 to 15 kt, shifting to NW in the afternoon.
Seas 2 ft or less. 
.FRI NIGHT...NW winds 10 to 20 kt. Seas 2 ft or less. 
.SAT...NW winds 10 to 20 kt. Seas 2 ft or less. 
.SAT NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. 
.SUN...N winds less than 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 ft or less. 
.SUN NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. 
.MON...NE winds 10 to 15 kt. Seas 2 ft or less. 

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

.TODAY...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.TONIGHT...SE winds 10 to 20 kt W of 70W, and SE 15 to 25 kt
elsewhere. Seas 5 to 7 ft. 
.FRI...S winds 10 to 20 kt. Seas 4 to 5 ft W of 70W, and 6 to
8 ft elsewhere. 
.FRI NIGHT...SW winds 10 to 20 kt W of 70W, and S 15 to 25 kt
elsewhere. Seas 4 to 5 ft W of 70W, and 6 to 8 ft elsewhere. 
.SAT...SW winds 10 to 20 kt. Seas 5 to 7 ft. 
.SAT NIGHT...NE winds 10 to 15 kt. Seas 5 to 7 ft. 
.SUN...TROPICAL STORM CONDITIONS POSSIBLE. 
.SUN NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.MON...TROPICAL STORM CONDITIONS POSSIBLE. 

ATLC waters S of 22N W of 65W

.TODAY...E winds 10 to 15 kt. Seas 3 to 5 ft. 
.TONIGHT...E winds 15 to 25 kt. Seas 3 to 5 ft. 
.FRI...SE winds 15 to 25 kt. Seas 4 to 6 ft. 
.FRI NIGHT...SE winds 15 to 25 kt, diminishing to 10 to 15 kt
after midnight. Seas 3 to 5 ft. 
.SAT...S winds 10 to 15 kt, shifting to E in the afternoon. Seas
3 to 5 ft. 
.SAT NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.SUN...TROPICAL STORM CONDITIONS POSSIBLE. 
.SUN NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.MON...N winds 10 to 20 kt. Seas 5 to 7 ft. 

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

.TODAY...E winds 15 to 25 kt. Seas 6 to 9 ft. 
.TONIGHT...E winds 15 to 25 kt. Seas 6 to 9 ft. 
.FRI...E winds 15 to 25 kt. Seas 7 to 9 ft. 
.FRI NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. E winds 15 to
25 kt. Seas 8 to 10 ft. 
.SAT...TROPICAL STORM CONDITIONS POSSIBLE. E winds 20 to 30 kt,
increasing to 30 to 40 kt in the afternoon. Seas 8 to 12 ft. 
.SAT NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.SUN...HURRICANE CONDITIONS POSSIBLE. 
.SUN NIGHT...HURRICANE CONDITIONS POSSIBLE. 
.MON...TROPICAL STORM CONDITIONS POSSIBLE.