000
FZNT31 KNHC 281531
OFFN20

Marine Weather HF Voice Broadcast
NWS National Hurricane Center Miami, FL
1131 AM EDT Mon Aug 28 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 Idalia is near 20.8N 85.2W at 11 AM
EDT, and is moving north at 7 kt. Maximum sustained winds are
55 kt with gusts to 65 kt, and the minimum central pressure is
990 mb. Idalia will strengthen to a hurricane near 22.0N 85.2W
this evening, move to 23.9N 85.1W Tue morning, 26.4N 84.6W Tue
evening, 29.2N 83.5W Wed morning, move inland and weaken to a
tropical storm near 31.9N 81.2W Wed evening, and 33.6N 78.0W Thu
morning. Idalia will change little in intensity as it moves to
near 34.6N 71.2W early Fri. Other than Idalia, gentle to
moderate winds will prevail across the basin E of 80W through
early Mon. High pressure will build westward across the western
Atlantic late Mon through Thu as Hurricane Franklin lifts north
of the region. This will lead to moderate to fresh trade winds
in the eastern Caribbean by Mon night, then in the central
Caribbean by Tue, locally strong there. 

NW Caribbean W of 85W

...TROPICAL STORM WARNING...

.THIS AFTERNOON...TROPICAL STORM CONDITIONS. SW winds 45 to
55 kt. Seas 6 to 8 ft. 
.TONIGHT...TROPICAL STORM CONDITIONS EXPECTED. SW winds 45 to
55 kt, diminishing to 35 to 45 kt after midnight. Seas 5 to
7 ft. 
.TUE...SW winds 20 to 30 kt, diminishing to 10 to 20 kt in the
afternoon. Seas 4 to 6 ft. 
.TUE NIGHT...S winds 10 to 20 kt. Seas 3 to 5 ft. 
.WED...S winds 10 to 15 kt. Seas 3 to 5 ft. 
.WED NIGHT...SE winds 10 to 15 kt. Seas 3 to 4 ft. 
.THU...SE winds 10 to 15 kt. Seas 3 to 4 ft. 
.THU NIGHT...SE winds 10 to 15 kt. Seas 3 to 4 ft. 
.FRI...E winds 10 to 15 kt. Seas 3 to 4 ft. 

Caribbean N of 15N between 72W and 85W

...TROPICAL STORM WARNING...

.THIS AFTERNOON...TROPICAL STORM CONDITIONS. SE winds 10 to
20 kt S of 18N, and S 45 to 55 kt elsewhere. Seas 3 ft S of 18N,
and 5 to 7 ft elsewhere. 
.TONIGHT...TROPICAL STORM CONDITIONS EXPECTED. S of 18N, SE
winds 10 to 20 kt. Elsewhere, S winds 40 to 50 kt, diminishing
to 30 to 40 kt after midnight. Seas 3 ft S of 18N, and 4 to 6 ft
elsewhere. 
.TUE...S of 18N, SE winds 10 to 20 kt. Elsewhere, S winds 20 to
30 kt, diminishing to 10 to 20 kt in the afternoon. Seas 3 to
5 ft. 
.TUE NIGHT...SE winds 10 to 20 kt. Seas 3 to 5 ft. 
.WED...SE winds 10 to 20 kt. Seas 3 to 5 ft. 
.WED NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. 
.THU...E winds 10 to 20 kt. Seas 4 to 6 ft S of 18N, and 3 to
4 ft elsewhere. 
.THU NIGHT...E winds 10 to 20 kt. S of 18N, seas 4 to 6 ft.
Elsewhere, seas 3 ft in the evening, subsiding to 2 ft or less. 
.FRI...E winds 10 to 20 kt. Seas 4 to 6 ft S of 18N, and 2 ft or
less elsewhere. 

Caribbean from 11N to 15N W of 72W

.THIS AFTERNOON...SE winds 10 to 15 kt. Seas 2 ft or less. 
.TONIGHT...E winds 10 to 20 kt. Seas 2 ft or less. 
.TUE...E winds 10 to 20 kt. Seas 2 ft or less, building to 3 ft
in the afternoon. 
.TUE NIGHT...E winds 15 to 25 kt. Seas 3 to 5 ft. 
.WED...E winds 15 to 25 kt. Seas 5 to 7 ft within 90 nm of coast
of Colombia, and 3 to 5 ft elsewhere. 
.WED NIGHT...E winds 15 to 25 kt. Seas 4 to 6 ft. 
.THU...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.THU NIGHT...E winds 10 to 20 kt within 90 nm of coast of
Colombia, and E 15 to 25 kt elsewhere. Seas 5 to 7 ft. 
.FRI...E winds 10 to 20 kt within 90 nm of coast of Colombia,
and E 15 to 25 kt elsewhere. Seas 4 to 6 ft. 

SW Caribbean S of 11N

.THIS AFTERNOON...S winds less than 10 kt. Seas 2 ft or less. 
.TONIGHT...N winds less than 10 kt in the evening, becoming
variable winds less than 10 kt. Seas 2 ft or less. 
.TUE...SE winds less than 10 kt. Seas 2 ft or less. 
.TUE NIGHT...NE winds less than 10 kt. Seas 2 ft or less. 
.WED...N winds 10 to 15 kt. Seas 2 ft or less. 
.WED NIGHT...N winds less than 10 kt, increasing to 10 to 15 kt
after midnight. Seas 3 ft. 
.THU...N winds 10 to 15 kt. Seas 3 to 5 ft. 
.THU NIGHT...NW winds less than 10 kt, shifting to N after
midnight. Seas 3 to 5 ft. 
.FRI...S winds 10 to 15 kt, shifting to W in the afternoon. Seas
3 to 5 ft. 

Caribbean between 64W and 72W

.THIS AFTERNOON...W winds less than 10 kt Gulf of Venezuela, and
SE 10 to 20 kt elsewhere. Seas 2 ft or less Gulf of Venezuela,
and 3 to 5 ft elsewhere. 
.TONIGHT...E winds 10 to 20 kt. Seas 2 ft or less Gulf of
Venezuela, and 4 to 6 ft elsewhere. 
.TUE...E winds 10 to 20 kt. Seas 3 ft Gulf of Venezuela, and
4 to 6 ft elsewhere. 
.TUE NIGHT...E winds 15 to 25 kt. Seas 4 to 6 ft. 
.WED...E winds 10 to 20 kt. Seas 4 to 6 ft. 
.WED NIGHT...NE winds 10 to 20 kt Gulf of Venezuela, and E 15 to
25 kt elsewhere. Seas 4 to 6 ft. 
.THU...E winds 10 to 20 kt. Seas 3 to 4 ft Gulf of Venezuela,
and 5 to 7 ft elsewhere. 
.THU NIGHT...E winds 15 to 25 kt. Seas 3 to 5 ft Gulf of
Venezuela, and 5 to 7 ft elsewhere. 
.FRI...E winds 10 to 20 kt Gulf of Venezuela, and E 15 to 25 kt
elsewhere. 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

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

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

.THIS AFTERNOON...E winds 10 to 20 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 3 to 5 ft. 
.WED...E winds 10 to 20 kt. Seas 3 to 5 ft. 
.WED NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. 
.THU...E winds 10 to 15 kt. Seas 3 to 5 ft. 
.THU NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. 
.FRI...E winds 10 to 15 kt. Seas 3 to 5 ft. 

Synopsis for the the SW N Atlantic including the Bahamas

.SYNOPSIS...Hurricane Franklin is near 27.8N 71.0W at 11 AM EDT,
and is moving north at 8 kt. Maximum sustained winds are 125 kt 
with gusts to 150 kt, and the minimum central pressure is
937 mb. Franklin will move to 29.0N 71.2W this evening, 30.7N 
70.8W Tue morning, and N of the forecast region near 32.5N 69.6W 
Tue evening. Then, Franklin will continue to move northward away 
from the area. Meanwhile, Tropical Storm Idalia is near 20.8N 
85.2W at 11 AM EDT, and is moving north at 7 kt. Maximum 
sustained winds are 55 kt with gusts to 65 kt, and the minimum 
central pressure is 990 mb. Idalia will strengthen to a hurricane
near 22.0N 85.2W this evening, move to 23.9N 85.1W Tue morning, 
26.4N 84.6W Tue evening, 29.2N 83.5W Wed morning, move inland and
weaken to a tropical storm near 31.9N 81.2W Wed evening, and 
33.6N 78.0W Thu morning. Idalia will change little in intensity 
as it moves to near 34.6N 71.2W early Fri. Expect increasing 
winds and seas offshore of central and northern Florida with the 
passage of Idalia. 

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

.THIS AFTERNOON...E winds less than 10 kt. Seas 6 to 8 ft. 
.TONIGHT...E winds less than 10 kt, shifting to S after
midnight. Seas 6 to 9 ft. 
.TUE...SW winds less than 10 kt. Seas 6 to 9 ft.
.TUE NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. S winds 10 to
20 kt. Seas 6 to 8 ft. 
.WED...HURRICANE CONDITIONS POSSIBLE. S winds 15 to 25 kt,
increasing to 25 to 35 kt in the afternoon. Seas 6 to 9 ft. 
.WED NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.THU...SW winds 20 to 30 kt. Seas 7 to 10 ft. 
.THU NIGHT...W winds 10 to 20 kt. Seas 5 to 7 ft. 
.FRI...NW winds 10 to 20 kt. Seas 4 to 6 ft. 

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

...HURRICANE WARNING...

.THIS AFTERNOON...HURRICANE CONDITIONS. NE winds 95 to 115 kt W
of 70W, and SE 35 to 45 kt elsewhere. Seas 14 to 19 ft W of 70W,
and 11 to 16 ft elsewhere. 
.TONIGHT...HURRICANE CONDITIONS EXPECTED. NW winds 105 to
125 kt W of 70W, and S 35 to 45 kt elsewhere. Seas 15 to 20 ft W
of 70W, and 11 to 16 ft elsewhere. 
.TUE...HURRICANE CONDITIONS EXPECTED. W of 70W, NW winds 105 to
125 kt, becoming W 85 to 105 kt in the afternoon,Seas 14 to
19 ft, subsiding to 10 to 15 ft in the afternoon. Elsewhere, S
winds 45 to 55 kt, increasing to 55 to 65 kt in the
afternoon,Seas 12 to 17 ft. 
.TUE NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. W winds 35 to
45 kt, diminishing to 20 to 30 kt after midnight. Seas 8 to
13 ft W of 70W, and 10 to 15 ft elsewhere. 
.WED...TROPICAL STORM CONDITIONS POSSIBLE. SW winds 15 to 25 kt
W of 70W, and W 20 to 30 kt elsewhere. W of 70W, seas 6 to 9 ft.
Elsewhere, seas 9 to 14 ft, subsiding to 8 to 11 ft in the
afternoon. 
.WED NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. 
.THU...SW winds 20 to 30 kt W of 70W, and W 10 to 15 kt
elsewhere. Seas 5 to 7 ft. 
.THU NIGHT...SW winds 15 to 25 kt W of 70W, and NW less than
10 kt elsewhere. Seas 6 to 8 ft W of 70W, and 4 to 5 ft
elsewhere. 
.FRI...SW winds 10 to 20 kt W of 70W, and E less than 10 kt
elsewhere. Seas 5 to 7 ft. 

Bahamas N of 22N

.THIS AFTERNOON...SW winds less than 10 kt. Seas 3 to 5 ft. 
.TONIGHT...SW winds 10 to 15 kt. Seas 3 to 5 ft. 
.TUE...S winds 10 to 15 kt. Seas 3 ft. 
.TUE NIGHT...S winds 10 to 20 kt. Seas 3 ft. 
.WED...S winds 10 to 20 kt. Seas 2 ft or less. 
.WED NIGHT...S winds 10 to 20 kt. Seas 2 ft or less. 
.THU...SE winds 10 to 15 kt. Seas 2 ft or less. 
.THU NIGHT...SE winds 10 to 15 kt. Seas 2 ft or less. 
.FRI...E winds 10 to 15 kt. Seas 2 ft or less. 

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

...TROPICAL STORM WARNING...

.THIS AFTERNOON...TROPICAL STORM CONDITIONS. SW winds 30 to
40 kt. Seas 8 to 11 ft. 
.TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. SW winds 20 to
30 kt. Seas 7 to 10 ft. 
.TUE...SW winds 15 to 25 kt. Seas 6 to 9 ft. 
.TUE NIGHT...SW winds 10 to 20 kt. Seas 6 to 8 ft. 
.WED...S winds 10 to 20 kt. Seas 5 to 7 ft. 
.WED NIGHT...S winds 10 to 15 kt. Seas 4 to 6 ft.
.THU...S 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 3 to 4 ft. 

ATLC waters S of 22N W of 65W

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

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

.THIS AFTERNOON...S winds 10 to 15 kt. Seas 4 to 5 ft. 
.TONIGHT...SE winds less than 10 kt, increasing to 10 to 15 kt
after midnight. Seas 4 ft. 
.TUE...SE winds 10 to 15 kt. Seas 4 ft. 
.TUE NIGHT...E winds 10 to 15 kt. Seas 4 ft. 
.WED...E winds 10 to 15 kt. Seas 4 to 5 ft. 
.WED NIGHT...E winds 10 to 15 kt. Seas 4 to 5 ft. 
.THU...E winds 10 to 15 kt. Seas 4 to 5 ft. 
.THU NIGHT...E winds 10 to 15 kt. Seas 4 to 5 ft. 
.FRI...E winds 10 to 15 kt. Seas 4 to 5 ft.