000
FZNT31 KNHC 231505
OFFN20

Marine Weather HF Voice Broadcast
NWS National Hurricane Center Miami, FL
1105 AM EDT Mon Oct 23 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...Hurricane Tammy will move northward and farther away
from the area today, with impacts from the system decreasing
over the forecast area. Showers and thunderstorms continue to
show signs of organization in association with a low pressure
system located over the southwestern Caribbean Sea.
Environmental conditions appear to be favorable for development,
and a short- lived tropical depression could form before the
system moves inland over Nicaragua by early Tuesday. There is a
medium chance for tropical cyclone development of this system in
the next couple of days. 

NW Caribbean W of 85W

.THIS AFTERNOON...E winds 10 to 15 kt. Seas 3 to 4 ft. 
.TONIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. 
.TUE...E winds 10 to 20 kt. Seas 3 to 5 ft. 
.TUE NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.WED...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.WED NIGHT...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 10 to 20 kt. Seas 5 to 7 ft. 

Caribbean N of 15N between 72W and 85W

.THIS AFTERNOON...E winds 10 to 20 kt. Seas 3 to 4 ft. 
.TONIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. 
.TUE...E winds 10 to 20 kt. Seas 3 to 5 ft. 
.TUE NIGHT...NE winds 10 to 15 kt S of 18N, and NE 15 to 25 kt
elsewhere. Seas 3 to 5 ft. 
.WED...E winds 10 to 20 kt S of 18N, and NE 15 to 25 kt
elsewhere. Seas 3 to 5 ft. 
.WED NIGHT...NE winds 10 to 20 kt S of 18N, and NE 15 to 25 kt
elsewhere. Seas 4 to 6 ft. 
.THU...E winds 10 to 20 kt S of 18N, and E 15 to 25 kt
elsewhere. Seas 4 to 6 ft. 
.THU NIGHT...E winds 10 to 20 kt S of 18N, and E 15 to 25 kt
elsewhere. Seas 4 to 6 ft. 
.FRI...E winds 10 to 20 kt S of 18N, and NE 15 to 25 kt
elsewhere. Seas 4 to 6 ft. 

Caribbean from 11N to 15N W of 72W

.THIS AFTERNOON...E winds 10 kt within 90 nm of coast of
Colombia, and E 15 to 25 kt elsewhere. Seas 3 to 4 ft. 
.TONIGHT...NE winds 10 to 15 kt within 90 nm of coast of
Colombia, and E 15 to 25 kt elsewhere. Seas 3 to 4 ft. 
.TUE...E winds 10 to 20 kt. Seas 3 ft. 
.TUE NIGHT...NE winds less than 10 kt. Seas 2 ft or less. 
.WED...E winds less than 10 kt within 90 nm of coast of
Colombia, and NE 10 to 15 kt elsewhere. Seas 2 ft or less. 
.WED NIGHT...E winds less than 10 kt within 90 nm of coast of
Colombia, and NE 10 to 15 kt elsewhere. Seas 2 ft or less. 
.THU...S winds less than 10 kt within 90 nm of coast of
Colombia, and NE 10 to 15 kt elsewhere. Seas 2 ft or less. 
.THU NIGHT...S winds less than 10 kt within 90 nm of coast of
Colombia, and NE 10 to 15 kt elsewhere. Seas 2 ft or less,
building to 3 ft after midnight. 
.FRI...NE winds 10 to 15 kt. Seas 3 to 4 ft. 

SW Caribbean S of 11N

.THIS AFTERNOON...S winds 10 to 15 kt. Seas 2 ft or less.
.TONIGHT...NE winds 10 to 15 kt, shifting to E after midnight.
Seas 2 ft or less. 
.TUE...SE winds less than 10 kt. Seas 2 ft or less. 
.TUE NIGHT...NW winds less than 10 kt. Seas 2 ft or less. 
.WED...W winds less than 10 kt. Seas 2 ft or less. 
.WED NIGHT...W winds less than 10 kt. Seas 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...W winds 10 to 15 kt. Seas 2 ft or less. 

Caribbean between 64W and 72W

.THIS AFTERNOON...Gulf of Venezuela, Variable winds less than
10 kt, becoming NE 10 kt in the afternoon. Elsewhere, SE winds
10 to 15 kt. Seas 2 ft or less Gulf of Venezuela, and 3 ft
elsewhere. 
.TONIGHT...Gulf of Venezuela, NE winds 10 to 15 kt. Elsewhere, E
winds less than 10 kt, increasing to 10 to 15 kt after midnight.
Seas 3 ft. 
.TUE...E winds 10 to 15 kt. Seas 2 ft or less Gulf of Venezuela,
and 3 ft elsewhere. 
.TUE NIGHT...NE winds 10 to 20 kt. Seas 3 ft. 
.WED...Gulf of Venezuela, E winds 10 kt in the morning, becoming
variable winds less than 10 kt. Elsewhere, NE winds 10 to 20 kt.
Seas 2 ft or less Gulf of Venezuela, and 3 to 4 ft elsewhere. 
.WED NIGHT...E winds less than 10 kt Gulf of Venezuela, and NE
15 to 25 kt elsewhere. Seas 2 ft or less Gulf of Venezuela, and
3 to 5 ft elsewhere. 
.THU...Variable winds less than 10 kt Gulf of Venezuela, and E
15 to 25 kt elsewhere. Seas 2 ft or less Gulf of Venezuela, and
3 to 5 ft elsewhere. 
.THU NIGHT...NE winds less than 10 kt Gulf of Venezuela, and NE
15 to 25 kt elsewhere. Seas 2 ft or less Gulf of Venezuela, and
3 to 5 ft elsewhere. 
.FRI...Variable winds less than 10 kt Gulf of Venezuela, and E
10 to 20 kt elsewhere. 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

.THIS AFTERNOON...SE winds 10 to 20 kt. Seas 4 to 6 ft. 
.TONIGHT...SE winds 10 to 15 kt. Seas 4 to 6 ft. 
.TUE...SE winds 10 to 15 kt. Seas 4 to 6 ft. 
.TUE NIGHT...S winds 10 to 15 kt. Seas 4 to 6 ft. 
.WED...S winds 10 to 15 kt. Seas 3 to 5 ft. 
.WED NIGHT...S winds 10 to 15 kt. Seas 4 to 6 ft.
.THU...SE winds 10 to 15 kt. Seas 4 to 6 ft. 
.THU NIGHT...SE winds 10 to 15 kt. Seas 5 to 7 ft. 
.FRI...SE winds 10 to 15 kt. Seas 5 to 7 ft. 

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

.THIS AFTERNOON...SE winds 10 to 15 kt. Seas 3 to 5 ft. 
.TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. 
.TUE...SE winds 10 to 15 kt, diminishing to less than 10 kt in
the afternoon. Seas 3 to 5 ft. 
.TUE NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. 
.WED...SE winds 10 to 15 kt. Seas 3 to 4 ft. 
.WED NIGHT...E 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 15 kt. Seas 3 to 5 ft. 
.FRI...E winds 10 to 15 kt. Seas 4 to 6 ft. 

Synopsis for the the SW N Atlantic including the Bahamas

.SYNOPSIS...Hurricane Tammy is near 21.9N 63.9W at 11 AM EDT, 
and is moving north at 6 kt. Maximum sustained winds are 70 kt 
with gusts to 85 kt, and the minimum central pressure is 993 mb. 
Tammy will move to 22.7N 63.4W this evening, 23.6N 62.4W Tue 
morning, 24.5N 61.2W Tue evening, 25.8N 59.9W Wed morning, 27.3N 
58.9W Wed evening, and weaken as an extratropical cyclone near 
29.1N 58.6W Thu morning. Tammy will change little in intensity as
it moves to near 31.2N 60.2W early Fri. A stationary front from 
near 31N61W to central Cuba will remain in place this week. High 
pressure will move off the east coast of the United States later 
tonight, and build north of the forecast area through midweek. 
The pressure gradient between the front, Tammy, and the area of 
building high pressure will tighten. The tightening pressure 
gradient will help to develop of a broad area of strong NE winds 
and rough seas across much of the area west of the boundary 
starting tonight and continuing through the week. 

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

.THIS AFTERNOON...NE winds 10 to 15 kt. Seas 3 to 5 ft. 
.TONIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. 
.TUE...NE winds 15 to 25 kt. Seas 6 to 8 ft. 
.TUE NIGHT...E winds 20 to 30 kt. Seas 6 to 9 ft. 
.WED...E winds 20 to 30 kt. Seas 7 to 10 ft. 
.WED NIGHT...E winds 20 to 30 kt. Seas 8 to 11 ft.
.THU...E winds 20 to 30 kt. Seas 8 to 12 ft. 
.THU NIGHT...E winds 20 to 30 kt. Seas 8 to 12 ft. 
.FRI...E winds 15 to 25 kt. Seas 8 to 11 ft. 

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

.THIS AFTERNOON...N winds 10 to 15 kt. Seas 5 to 7 ft. 
.TONIGHT...NE winds 10 to 20 kt. Seas 6 to 8 ft. 
.TUE...NE winds 15 to 25 kt. Seas 7 to 9 ft. 
.TUE NIGHT...NE winds 20 to 30 kt. Seas 8 to 11 ft. 
.WED...NE winds 20 to 30 kt. Seas 9 to 13 ft. 
.WED NIGHT...NE winds 20 to 30 kt. Seas 10 to 14 ft. 
.THU...NE winds 20 to 30 kt. Seas 9 to 13 ft W of 70W, and 12 to
16 ft elsewhere. 
.THU NIGHT...NE winds 20 to 30 kt. Seas 9 to 13 ft W of 70W, and
12 to 17 ft elsewhere. 
.FRI...TROPICAL STORM CONDITIONS POSSIBLE. 

Bahamas N of 22N

.THIS AFTERNOON...NE winds 10 to 20 kt. Seas 3 ft. 
.TONIGHT...NE winds 10 to 20 kt. Seas 3 to 4 ft. 
.TUE...NE winds 20 to 30 kt. Seas 3 to 5 ft. 
.TUE NIGHT...NE winds 20 to 30 kt. Seas 5 to 7 ft. 
.WED...NE winds 20 to 30 kt. Seas 5 to 7 ft. 
.WED NIGHT...NE winds 20 to 30 kt. Seas 5 to 7 ft. 
.THU...E winds 20 to 30 kt. Seas 6 to 8 ft. 
.THU NIGHT...E winds 20 to 30 kt. Seas 6 to 8 ft. 
.FRI...NE winds 15 to 25 kt. Seas 6 to 8 ft. 

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

.THIS AFTERNOON...NE winds 10 to 20 kt W of 70W, and NE 15 to
25 kt elsewhere. Seas 5 to 7 ft W of 70W, and 8 to 11 ft
elsewhere. 
.TONIGHT...NE winds 10 to 20 kt W of 70W, and NE 15 to 25 kt
elsewhere. Seas 6 to 8 ft W of 70W, and 8 to 11 ft elsewhere. 
.TUE...NE winds 20 to 30 kt W of 70W, and NE 15 to 25 kt
elsewhere. Seas 7 to 10 ft. 
.TUE NIGHT...NE winds 20 to 30 kt. Seas 8 to 12 ft. 
.WED...NE winds 20 to 30 kt. Seas 10 to 13 ft.
.WED NIGHT...NE winds 20 to 30 kt. Seas 10 to 14 ft. 
.THU...NE winds 20 to 30 kt. Seas 11 to 14 ft. 
.THU NIGHT...NE winds 20 to 30 kt. Seas 11 to 14 ft. 
.FRI...NE winds 20 to 30 kt W of 70W, and NE 15 to 25 kt
elsewhere. Seas 11 to 14 ft. 

ATLC waters S of 22N W of 65W

.THIS AFTERNOON...NE winds 15 to 25 kt. Seas 6 to 8 ft. 
.TONIGHT...NE winds 10 to 20 kt. Seas 5 to 7 ft. 
.TUE...NE winds 10 to 20 kt. Seas 5 to 7 ft. 
.TUE NIGHT...NE winds 10 to 20 kt. Seas 6 to 9 ft. 
.WED...NE winds 10 to 20 kt. Seas 6 to 9 ft. 
.WED NIGHT...NE winds 15 to 25 kt. Seas 6 to 9 ft. 
.THU...NE winds 15 to 25 kt. Seas 7 to 10 ft. 
.THU NIGHT...NE winds 15 to 25 kt. Seas 7 to 10 ft. 
.FRI...NE winds 10 to 20 kt. Seas 7 to 10 ft. 

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

...HURRICANE WARNING...

.THIS AFTERNOON...TROPICAL STORM CONDITIONS. SE winds 55 to
65 kt. Seas 8 to 13 ft. 
.TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. S winds 30 to
40 kt. Seas 7 to 10 ft. 
.TUE...TROPICAL STORM CONDITIONS POSSIBLE. S winds 20 to 30 kt.
Seas 6 to 9 ft. 
.TUE NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. S winds 15 to
25 kt. Seas 6 to 8 ft. 
.WED...SW winds 10 to 20 kt. Seas 6 to 8 ft. 
.WED NIGHT...S winds 10 to 20 kt. Seas 7 to 10 ft. 
.THU...SE winds 10 to 15 kt. Seas 7 to 10 ft. 
.THU NIGHT...SE winds 10 to 15 kt. Seas 7 to 10 ft. 
.FRI...SE winds 10 to 15 kt. Seas 7 to 10 ft.