877
FZNT31 KNHC 230808
OFFN20
MARINE WEATHER HF VOICE BROADCAST
NWS NATIONAL HURRICANE CENTER MIAMI, FL
408 AM EDT SAT AUG 23 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
FRESH TO STRONG TRADES AND MODERATE TO LOCALLY ROUGH
SEAS WILL PREVAIL OVER THE CENTRAL CARIBBEAN LATER TODAY THROUGH
THE NEXT SEVERAL DAYS AS CENTRAL ATLANTIC HIGH PRESSURE BUILDS
W-SW ACROSS THE WESTERN ATLANTIC, IN THE WAKE OF DISTANT
EXTRATROPICAL CYCLONE ERIN. FRESH TO STRONG E TO SE WINDS WILL
PULSE ACROSS THE GULF OF HONDURAS AT NIGHT. MODERATE TO FRESH
TRADES ARE EXPECTED IN THE EASTERN CARIBBEAN AND ACROSS THE
APPROACH TO THE WINDWARD PASSAGE, INCREASING TO FRESH TO STRONG
LATE IN THE WEEKEND INTO EARLY NEXT WEEK IN THE EASTERN
CARIBBEAN. MAINLY MODERATE OR WEAKER WINDS ARE FORECAST
ELSEWHERE. MEANWHILE, SHOWERS AND THUNDERSTORMS ASSOCIATED WITH
A TROPICAL WAVE LOCATED MORE THAN ONE THOUSAND NAUTICAL MILES
EAST OF THE WINDWARD ISLANDS HAVE BECOME LESS ORGANIZED OVER THE
PAST 24 HOURS, AND THE SYSTEM IS CURRENTLY BEING AFFECTED BY
STRONG WIND SHEAR. NO DEVELOPMENT IS EXPECTED THROUGH TONIGHT
WHILE THE SYSTEM TRAVERSES THE AREA OF STRONG WIND SHEAR. THE
WAVE COULD REACH A SLIGHTLY MORE FAVORABLE ENVIRONMENT SUN AND
MON AS IT APPROACHES THE WINDWARD ISLANDS, AND SOME SLOW
DEVELOPMENT IS POSSIBLE DURING THAT TIME. BY THE MIDDLE OF NEXT
WEEK, CONDITIONS OVER THE CARIBBEAN ARE EXPECTED TO BE
UNFAVORABLE FOR FURTHER DEVELOPMENT.
NW CARIBBEAN W OF 85W
TODAY
SE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT.
TONIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
SUN
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
SUN NIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 4 FT.
MON
E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT.
MON NIGHT
E WINDS 10 TO 20 KT. SEAS 4 TO 6 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
NE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
WED NIGHT
E WINDS LESS THAN 10 KT. SEAS 3 FT.
CARIBBEAN N OF 15N BETWEEN 72W AND 85W
TODAY
E WINDS 10 TO 15 KT S OF 18N, AND E LESS THAN 10 KT
ELSEWHERE. SEAS 3 TO 5 FT.
TONIGHT
E WINDS 10 TO 15 KT S OF 18N, AND E 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.
SUN
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
SUN NIGHT
E WINDS 10 TO 20 KT S OF 18N, AND E LESS THAN 10 KT
ELSEWHERE. SEAS 4 TO 6 FT S OF 18N, AND 3 FT ELSEWHERE.
MON
E WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
MON NIGHT
E WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
TUE
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
TUE NIGHT
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
WED
E WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
WED NIGHT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
CARIBBEAN FROM 11N TO 15N W OF 72W
TODAY
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
TONIGHT
E WINDS 10 TO 15 KT. SEAS 4 TO 5 FT.
SUN
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.
SUN NIGHT
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.
MON
E WINDS 15 TO 25 KT. SEAS 6 TO 8 FT.
MON NIGHT
NE WINDS 15 TO 25 KT. SEAS 6 TO 8 FT.
TUE
NE WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
TUE NIGHT
NE WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
WED
E WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
WED NIGHT
NE WINDS 10 TO 20 KT. SEAS 6 TO 8 FT.
SW CARIBBEAN S OF 11N
TODAY
E WINDS LESS THAN 10 KT, SHIFTING TO W IN THE
AFTERNOON. SEAS 3 TO 5 FT.
TONIGHT
NW WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
SUN
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
SUN NIGHT
NW WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
MON
NW WINDS LESS THAN 10 KT. SEAS 4 TO 6 FT.
MON NIGHT
N WINDS LESS THAN 10 KT, SHIFTING TO NE AFTER
MIDNIGHT. SEAS 4 TO 6 FT.
TUE
NE WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TUE NIGHT
NE WINDS LESS THAN 10 KT. SEAS 5 TO 7 FT.
WED
SE WINDS LESS THAN 10 KT, SHIFTING TO W IN THE AFTERNOON.
SEAS 4 TO 6 FT.
WED NIGHT
NW WINDS LESS THAN 10 KT. SEAS 4 TO 5 FT.
CARIBBEAN BETWEEN 64W AND 72W
TODAY
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
TONIGHT
NE WINDS 15 TO 25 KT GULF OF VENEZUELA, AND E 10 TO
20 KT ELSEWHERE. SEAS 4 TO 6 FT.
SUN
E WINDS 15 TO 25 KT GULF OF VENEZUELA, AND E 10 TO 20 KT
ELSEWHERE. SEAS 4 TO 6 FT.
SUN NIGHT
E WINDS 20 TO 30 KT GULF OF VENEZUELA, AND E 10 TO
20 KT ELSEWHERE. SEAS 5 TO 7 FT.
MON
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
MON NIGHT
E WINDS 15 TO 25 KT. SEAS 5 TO 7 FT.
TUE
E WINDS 10 TO 20 KT. SEAS 6 TO 8 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 5 TO 7 FT.
OFFSHORE LEEWARD ISLANDS AND ADJACENT ATLC WATERS FROM 15N TO
19N W OF 55W
TODAY
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
TONIGHT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
SUN
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
SUN NIGHT
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
MON
E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT.
MON NIGHT
E WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
TUE
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TUE NIGHT
E WINDS LESS THAN 10 KT. SEAS 4 TO 6 FT.
WED
SE WINDS LESS THAN 10 KT. SEAS 4 TO 6 FT.
WED NIGHT
E WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
OFFSHORE WINDWARD ISLANDS AND ADJACENT ATLC WATERS FROM 07N TO
15N W OF 55W
TODAY
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
TONIGHT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
SUN
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
SUN NIGHT
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
MON
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
MON NIGHT
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TUE
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TUE NIGHT
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.
SYNOPSIS FOR THE THE SW N ATLANTIC INCLUDING THE BAHAMAS
SYNOPSIS
LARGE NORTHERLY SWELL GENERATED BY EXTRATROPICAL
CYCLONE ERIN WILL CONTINUE TO AFFECT THE W ATLANTIC WATERS
THROUGH THE NEXT FEW DAYS. IN THE WAKE OF ERIN, CENTRAL ATLANTIC
HIGH PRESSURE WILL BUILD W-SW TOWARD THE CENTRAL BAHAMAS AND THE
STRAITS OF FLORIDA. MEANWHILE, SHOWERS AND THUNDERSTORMS HAVE
BECOME A LITTLE BETTER ORGANIZED IN ASSOCIATION WITH A TROUGH OF
LOW PRESSURE, AL90, LOCATED A FEW HUNDRED NAUTICAL MILES NORTH OF
THE NORTHERN LEEWARD ISLANDS. ENVIRONMENTAL CONDITIONS APPEAR
CONDUCIVE FOR FURTHER DEVELOPMENT OF THIS SYSTEM, AND A TROPICAL
STORM IS EXPECTED TO FORM THIS WEEKEND WHILE IT MOVES NORTH-
NORTHWESTWARD AND THEN NORTHWARD OVER THE SOUTHWESTERN ATLANTIC.
THIS SYSTEM HAS A HIGH CHANCE OF TROPICAL CYCLONE FORMATION.
REGARDLESS OF FORMATION, GALE-FORCE WINDS ARE EXPECTED TO DEVELOP
ACROSS THE EASTERN SEMICIRCLE OF THIS LOW BEGINNING LATE TONIGHT
INTO SUN MORNING, WITH BUILDING SEAS. A SLOW MOVING COLD FRONT
MAY MOVE OFF THE SE U.S. INTO THE NW WATERS BY THE MIDDLE OF NEXT
WEEK.
ATLC WATERS FROM 27N TO 31N W OF 77W
TODAY
SW WINDS LESS THAN 10 KT. SEAS 6 TO 8 FT.
TONIGHT
SW WINDS LESS THAN 10 KT, INCREASING TO 10 TO 15 KT
AFTER MIDNIGHT. SEAS 6 TO 7 FT.
SUN
SW WINDS 10 TO 15 KT. SEAS 6 TO 7 FT.
SUN NIGHT
SW WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
MON
W WINDS 10 TO 15 KT. SEAS 5 TO 6 FT.
MON NIGHT
SW WINDS 10 KT. SEAS 4 TO 5 FT.
TUE
SW WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
TUE NIGHT
S WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
WED
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 FT.
WED NIGHT
E WINDS LESS THAN 10 KT. SEAS 3 FT.
ATLC WATERS FROM 27N TO 31N BETWEEN 65W AND 77W
TODAY
W OF 70W, S WINDS 10 KT IN THE AFTERNOON. VARIABLE
WINDS LESS THAN 10 KT IN THE MORNING. ELSEWHERE, VARIABLE WINDS
LESS THAN 10 KT. SEAS 8 TO 11 FT.
TONIGHT
SW WINDS 10 KT W OF 70W, AND VARIABLE LESS THAN 10 KT
ELSEWHERE. SEAS 7 TO 10 FT.
SUN
SW WINDS 10 TO 15 KT W OF 70W, AND SW LESS THAN 10 KT
ELSEWHERE. SEAS 7 TO 9 FT.
SUN NIGHT
SW WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
MON
SW WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
MON NIGHT
SW WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TUE
SW WINDS 10 TO 15 KT, DIMINISHING TO LESS THAN 10 KT IN
THE AFTERNOON. SEAS 4 TO 6 FT.
TUE NIGHT
S WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
WED
S WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
WED NIGHT
SE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
BAHAMAS N OF 22N
TODAY
S WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
TONIGHT
SE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
SUN
SE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
SUN NIGHT
SE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
MON
SE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
MON NIGHT
E WINDS LESS THAN 10 KT, SHIFTING TO SE AFTER
MIDNIGHT. SEAS 3 TO 4 FT.
TUE
SE WINDS 10 TO 15 KT. SEAS 3 TO 4 FT.
TUE NIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 4 FT.
WED
E WINDS 10 TO 15 KT. SEAS 3 TO 4 FT.
WED NIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 4 FT.
ATLC WATERS FROM 22N TO 27N BETWEEN 65W AND THE BAHAMAS
TODAY
VARIABLE WINDS LESS THAN 10 KT, BECOMING SE LESS THAN
10 KT IN THE AFTERNOON. SEAS 7 TO 9 FT.
TONIGHT
SE WINDS LESS THAN 10 KT. SEAS 7 TO 9 FT.
SUN
SE WINDS LESS THAN 10 KT. SEAS 7 TO 8 FT.
SUN NIGHT
SE WINDS 10 KT. SEAS 6 TO 7 FT.
MON
SE WINDS 10 KT. SEAS 6 TO 7 FT.
MON NIGHT
SE WINDS 10 KT. SEAS 5 TO 7 FT.
TUE
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
TUE NIGHT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
WED
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
WED NIGHT
E WINDS 10 KT. SEAS 4 TO 5 FT.
ATLC WATERS S OF 22N W OF 65W
TODAY
E WINDS LESS THAN 10 KT. SEAS 4 TO 6 FT.
TONIGHT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
SUN
E WINDS 10 TO 15 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 5 TO 7 FT.
MON NIGHT
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
TUE
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
TUE NIGHT
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
WED
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
WED NIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
ATLC WATERS FROM 19N TO 22N BETWEEN 55W AND 65W
TODAY
SE WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TONIGHT
E WINDS 10 TO 15 KT. SEAS 6 TO 7 FT.
SUN
E WINDS 10 TO 15 KT. SEAS 7 TO 8 FT.
SUN NIGHT
E WINDS 10 TO 15 KT. SEAS 7 TO 8 FT.
MON
E WINDS 10 TO 15 KT. SEAS 7 TO 8 FT.
MON NIGHT
E WINDS 10 TO 15 KT. SEAS 7 TO 8 FT.
TUE
E WINDS 10 TO 15 KT. SEAS 6 TO 7 FT.
TUE NIGHT
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
WED
SE WINDS 10 KT. SEAS 5 TO 6 FT.
WED NIGHT
SE WINDS 10 KT. SEAS 5 FT.
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