570
FZNT31 KNHC 090317
OFFN20
MARINE WEATHER HF VOICE BROADCAST
NWS NATIONAL HURRICANE CENTER MIAMI, FL
1017 PM EST MON DEC 8 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
MODERATE TO OCCASIONALLY FRESH TRADE WINDS AND
MODERATE SEAS ARE EXPECTED OVER THE CENTRAL AND EASTERN
CARIBBEAN THROUGH TUE AS WEAK RIDGING PREVAILS OVER THE CENTRAL
ATLANTIC. WINDS MAY PULSE TO STRONG SPEEDS IN THE GULF OF
VENEZUELA AND OFFSHORE OF NORTHERN COLOMBIA BY TUE NIGHT, AND
LOCALLY ROUGH SEAS MAY DEVELOP NEAR AND TO THE WEST OF THESE
WINDS. A TIGHTENING PRESSURE GRADIENT BETWEEN A WEAKENING COLD
FRONT APPROACHING THE NORTHWESTERN CARIBBEAN AND LOW PRESSURE IN
THE SOUTH-CENTRAL BASIN WILL SUPPORT FRESH TO STRONG TRADE WINDS
AND ROUGH SEAS IN THE CENTRAL CARIBBEAN BEGINNING ON WED AND
INTO THE UPCOMING WEEKEND. WINDS MAY APPROACH NEAR GALE-FORCE
OFFSHORE OF COLOMBIA LATE WED. ELSEWHERE, A PERSISTENT EAST
SWELL WILL CONTINUE TO LEAD TO ROUGH SEAS OVER THE ATLANTIC
WATERS AND PASSAGES OF THE LESSER ANTILLES INTO EARLY WED BEFORE
SEAS SLIGHTLY SUBSIDE. NEW MIXED NORTH AND EAST SWELL IS
EXPECTED TO BRING ROUGH SEAS OVER THESE SAME WATERS STARTING
LATE WED NIGHT.
NW CARIBBEAN W OF 85W
TONIGHT
E WINDS LESS THAN 10 KT. SEAS 3 FT.
TUE
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
TUE NIGHT
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
WED
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
WED NIGHT
NE WINDS LESS THAN 10 KT IN THE EVENING, BECOMING
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 FT.
THU
NE WINDS LESS THAN 10 KT. SEAS 3 FT.
THU NIGHT
E WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
FRI
E WINDS 10 TO 15 KT. SEAS 3 TO 4 FT.
FRI NIGHT
E WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
SAT
E WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
SAT NIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
CARIBBEAN N OF 15N BETWEEN 72W AND 85W
TONIGHT
E WINDS 10 TO 15 KT S OF 18N, AND VARIABLE LESS THAN
10 KT ELSEWHERE. S OF 18N, SEAS 3 TO 5 FT. ELSEWHERE, SEAS 3 FT
IN THE EVENING, SUBSIDING TO 2 FT OR LESS.
TUE
E WINDS 10 TO 15 KT S OF 18N, AND E LESS THAN 10 KT
ELSEWHERE. SEAS 3 TO 5 FT S OF 18N, AND 2 FT OR LESS ELSEWHERE.
TUE NIGHT
E WINDS 10 TO 15 KT S OF 18N, AND E LESS THAN 10 KT
ELSEWHERE. SEAS 3 TO 5 FT S OF 18N, AND 2 FT OR LESS ELSEWHERE.
WED
E WINDS 10 TO 20 KT S OF 18N, AND E LESS THAN 10 KT
ELSEWHERE. SEAS 3 TO 5 FT S OF 18N, AND 2 FT OR LESS ELSEWHERE.
WED NIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
THU
NE WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
THU NIGHT
NE WINDS 10 TO 15 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.
SAT NIGHT
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
CARIBBEAN FROM 11N TO 15N W OF 72W
TONIGHT
E WINDS 10 TO 20 KT WITHIN 90 NM OF COAST OF
COLOMBIA, AND NE 10 TO 15 KT ELSEWHERE. SEAS 4 TO 6 FT.
TUE
E WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
TUE NIGHT
NE WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
WED
E WINDS 15 TO 25 KT WITHIN 90 NM OF COAST OF COLOMBIA,
AND E 10 TO 20 KT ELSEWHERE. SEAS 5 TO 7 FT.
WED NIGHT
NE WINDS 15 TO 25 KT. SEAS 6 TO 8 FT.
THU
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
THU NIGHT
NE WINDS 15 TO 25 KT. SEAS 6 TO 9 FT.
FRI
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
FRI NIGHT
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
SAT
E WINDS 15 TO 25 KT. SEAS 7 TO 10 FT.
SAT NIGHT
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
SW CARIBBEAN S OF 11N
TONIGHT
NE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
TUE
N WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
TUE NIGHT
N WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
WED
NE WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
WED NIGHT
NE WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
THU
NE WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
THU NIGHT
NE WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
FRI
NE WINDS 10 TO 15 KT. SEAS 6 TO 9 FT.
FRI NIGHT
NE WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
SAT
NE WINDS LESS THAN 10 KT. SEAS 6 TO 8 FT.
SAT NIGHT
N WINDS LESS THAN 10 KT, SHIFTING TO NE AFTER
MIDNIGHT. SEAS 6 TO 8 FT.
CARIBBEAN BETWEEN 64W AND 72W
TONIGHT
E WINDS 15 TO 20 KT GULF OF VENEZUELA, AND E 10 TO
15 KT ELSEWHERE. SEAS 4 TO 6 FT.
TUE
E WINDS 10 TO 15 KT. SEAS 3 FT GULF OF VENEZUELA, AND
4 TO 6 FT ELSEWHERE.
TUE NIGHT
E WINDS 15 TO 25 KT GULF OF VENEZUELA, AND E 10 TO
20 KT ELSEWHERE. SEAS 3 TO 5 FT GULF OF VENEZUELA, AND 5 TO 7 FT
ELSEWHERE.
WED
E WINDS 10 TO 20 KT. SEAS 5 TO 7 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.
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 9 FT.
OFFSHORE LEEWARD ISLANDS AND ADJACENT ATLC WATERS FROM 15N TO
19N W OF 55W
TONIGHT
E WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
TUE
E WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
TUE NIGHT
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
WED
E WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
WED NIGHT
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
THU
E WINDS 10 TO 20 KT. SEAS 7 TO 10 FT.
THU NIGHT
E WINDS 10 TO 20 KT. SEAS 7 TO 10 FT.
FRI
E WINDS 10 TO 20 KT. SEAS 7 TO 10 FT.
FRI NIGHT
E WINDS 10 TO 20 KT. SEAS 8 TO 11 FT.
SAT
E WINDS 10 TO 20 KT. SEAS 8 TO 11 FT.
SAT NIGHT
E WINDS 10 TO 20 KT. SEAS 7 TO 10 FT.
OFFSHORE WINDWARD ISLANDS AND ADJACENT ATLC WATERS FROM 07N TO
15N W OF 55W
TONIGHT
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
TUE
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
TUE NIGHT
E WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
WED
E WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
WED NIGHT
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
THU
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
THU NIGHT
E WINDS 10 TO 20 KT. SEAS 7 TO 10 FT.
FRI
E WINDS 10 TO 20 KT. SEAS 7 TO 10 FT.
FRI NIGHT
E WINDS 10 TO 20 KT. SEAS 8 TO 11 FT.
SAT
E WINDS 10 TO 20 KT. SEAS 8 TO 11 FT.
SAT NIGHT
E WINDS 10 TO 20 KT. SEAS 8 TO 11 FT.
SYNOPSIS FOR THE THE SW N ATLANTIC INCLUDING THE BAHAMAS
SYNOPSIS
A COLD FRONT EXTENDING FROM NEAR BERMUDA TO THE
CENTRAL BAHAMAS WILL CONTINUE EASTWARD THROUGH LATE TUE NIGHT,
PRECEDED BY FRESH TO STRONG SOUTHWEST WINDS NORTH OF 27N THROUGH
TUE. ROUGH SEAS IN WEST SWELL EAST OF 73W WILL CONTINUE TO
EXPAND TOWARD THE CENTRAL ATLANTIC INTO EARLY TUE AS VERY ROUGH
SEAS OVER 12 FT WILL BE POSSIBLE NORTH OF 30N AND EAST OF 64W BY
TUE MORNING. A SECOND AND STRONGER COLD FRONT EXTENDING FROM NEAR
31N73W TO THE NW BAHAMAS AND TO SOUTH FLORIDA WILL QUICKLY SHIFT
EASTWARD THROUGH TUE NIGHT OVERTAKING THE FIRST FRONT. THE FRONT
WILL BE FOLLOWED BY FRESH TO STRONG NORTHWEST WINDS, NORTH OF
ABOUT 26N AND WEST OF 68W INTO LATE TONIGHT. A NEW SET OF NORTH
SWELL WILL SUPPORT ROUGH SEAS OVER THE NORTHWEST TROPICAL
ATLANTIC BY LATE TONIGHT, BEFORE MERGING WITH THE AFOREMENTIONED
ROUGH SEAS IN THE CENTRAL BASIN ON TUE. WINDS WILL DIMINISH FROM
WEST TO EAST THROUGH TUE NIGHT, WITH ROUGH SEAS SLOWLY SUBSIDING
THROUGH LATE WEEK. LOOKING AHEAD, FRESH TO LOCALLY STRONG
SOUTHWEST WINDS AND ROUGH SEAS MAY DEVELOP OFFSHORE NORTHERN
FLORIDA STARTING WED AS A LOW PRESSURE SYSTEM MOVES OFF THE EAST
COAST OF THE U.S.
ATLC WATERS FROM 27N TO 31N W OF 77W
TONIGHT
N WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
TUE
N WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
TUE NIGHT
NE WINDS LESS THAN 10 KT IN THE EVENING, BECOMING
VARIABLE WINDS LESS THAN 10 KT. SEAS 6 TO 8 FT.
WED
W WINDS LESS THAN 10 KT, SHIFTING TO SW IN THE AFTERNOON.
SEAS 6 TO 7 FT.
WED NIGHT
W WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
THU
NW WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
THU NIGHT
NW WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
FRI
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
FRI NIGHT
S WINDS 10 TO 15 KT. SEAS 3 TO 4 FT.
SAT
N WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
SAT NIGHT
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 FT.
ATLC WATERS FROM 27N TO 31N BETWEEN 65W AND 77W
TONIGHT
NW WINDS 10 TO 20 KT W OF 70W, AND W 15 TO 25 KT
ELSEWHERE. SEAS 6 TO 9 FT.
TUE
N WINDS 10 TO 20 KT W OF 70W, AND NW 15 TO 25 KT
ELSEWHERE. SEAS 7 TO 10 FT.
TUE NIGHT
E WINDS LESS THAN 10 KT. SEAS 8 TO 11 FT.
WED
W OF 70W, VARIABLE WINDS LESS THAN 10 KT, BECOMING S
10 TO 15 KT IN THE AFTERNOON. ELSEWHERE, S WINDS 10 TO 15 KT.
SEAS 7 TO 10 FT.
WED NIGHT
SW WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
THU
W WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
THU NIGHT
W WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
FRI
NW WINDS 10 TO 15 KT, SHIFTING TO N IN THE AFTERNOON.
SEAS 6 TO 9 FT.
FRI NIGHT
NE WINDS LESS THAN 10 KT, SHIFTING TO S AFTER
MIDNIGHT. SEAS 5 TO 7 FT.
SAT
W WINDS LESS THAN 10 KT. SEAS 5 TO 7 FT.
SAT NIGHT
NE WINDS LESS THAN 10 KT. SEAS 5 TO 7 FT.
BAHAMAS N OF 22N
TONIGHT
NW WINDS LESS THAN 10 KT. SEAS 3 FT.
TUE
N WINDS LESS THAN 10 KT. SEAS 3 FT.
TUE NIGHT
NE WINDS LESS THAN 10 KT, SHIFTING TO S AFTER
MIDNIGHT. SEAS 3 TO 4 FT.
WED
S WINDS LESS THAN 10 KT IN THE MORNING, BECOMING VARIABLE
WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
WED NIGHT
VARIABLE WINDS LESS THAN 10 KT, BECOMING W LESS
THAN 10 KT AFTER MIDNIGHT. SEAS 3 TO 5 FT.
THU
NW WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
THU NIGHT
NE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
FRI
NE WINDS 10 TO 15 KT. SEAS 3 TO 4 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.
SAT NIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
ATLC WATERS FROM 22N TO 27N BETWEEN 65W AND THE BAHAMAS
TONIGHT
SW WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
TUE
W OF 70W, N WINDS 10 TO 15 KT. ELSEWHERE, SW WINDS 10 TO
15 KT, SHIFTING TO W IN THE AFTERNOON. SEAS 5 TO 7 FT.
TUE NIGHT
W OF 70W, E WINDS 10 TO 15 KT, SHIFTING TO SE AFTER
MIDNIGHT. ELSEWHERE, SE WINDS LESS THAN 10 KT. SEAS 5 TO 7 FT.
WED
S WINDS LESS THAN 10 KT. SEAS 6 TO 9 FT.
WED NIGHT
S WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
THU
SW WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
THU NIGHT
NW WINDS LESS THAN 10 KT. SEAS 5 TO 7 FT.
FRI
NE WINDS LESS THAN 10 KT. SEAS 5 TO 6 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 15 KT. SEAS 6 TO 8 FT.
ATLC WATERS S OF 22N W OF 65W
TONIGHT
SE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
TUE
SE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
TUE NIGHT
SE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
WED
SE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
WED NIGHT
SE WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
THU
E TO SE WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
THU NIGHT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
FRI
E WINDS 10 TO 15 KT. SEAS 4 TO 6 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 6 TO 9 FT.
ATLC WATERS FROM 19N TO 22N BETWEEN 55W AND 65W
TONIGHT
SE WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TUE
SE WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TUE NIGHT
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
WED
E WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
WED NIGHT
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
THU
E WINDS 10 TO 20 KT. SEAS 8 TO 10 FT.
THU NIGHT
E WINDS 10 TO 20 KT. SEAS 8 TO 11 FT.
FRI
E WINDS 10 TO 20 KT. SEAS 7 TO 10 FT.
FRI NIGHT
E WINDS 10 TO 20 KT. SEAS 7 TO 10 FT.
SAT
E WINDS 15 TO 20 KT. SEAS 8 TO 10 FT.
SAT NIGHT
E WINDS 15 TO 20 KT. SEAS 9 TO 10 FT.
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