642
FZNT31 KNHC 211500
OFFN20
MARINE WEATHER HF VOICE BROADCAST
NWS NATIONAL HURRICANE CENTER MIAMI, FL
1100 AM EDT THU AUG 21 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 SEAS SEAS WILL
EXIST OVER THE CENTRAL AND EASTERN CARIBBEAN THROUGH FRI AS A
STRENGTHENING PRESSURE GRADIENT DEVELOPS BETWEEN LOW PRESSURE
OVER COLOMBIA AND BUILDING HIGH PRESSURE IN THE WAKE OF
HURRICANE ERIN IN THE WEST ATLANTIC. ELSEWHERE, FRESH TO STRONG
EAST TO SOUTHEAST WINDS WILL PULSE IN THE GULF OF HONDURAS
BEGINNING TONIGHT. LONG PERIOD NORTHWEST TO NORTH SWELL FROM
HURRICANE ERIN WILL BEGIN TO IMPACT THE TROPICAL N ATLANTIC
ZONES FROM LATE ON FRI THROUGH MON. AN AREA OF SHOWERS AND
THUNDERSTORMS ASSOCIATED WITH A TROPICAL WAVE LOCATED A FEW
HUNDRED MILES EAST OF THE LEEWARD ISLANDS HAS CHANGED LITTLE
OVER THE PAST SEVERAL HOURS. ENVIRONMENTAL CONDITIONS APPEAR
CONDUCIVE FOR FURTHER DEVELOPMENT OF THIS SYSTEM, AND A TROPICAL
DEPRESSION IS LIKELY TO FORM THIS WEEKEND WHILE IT MOVES NEAR OR
TO THE NORTH OF THE NORTHERN LEEWARD ISLANDS.
NW CARIBBEAN W OF 85W
THIS AFTERNOON
SE WINDS LESS THAN 10 KT. SEAS 2 FT OR LESS.
TONIGHT
E WINDS 10 TO 15 KT. SEAS 2 FT OR LESS, BUILDING TO
3 FT AFTER MIDNIGHT.
FRI
SE WINDS 10 TO 15 KT. SEAS 3 TO 4 FT.
FRI NIGHT
SE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT.
SAT
E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT.
SAT NIGHT
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 15 KT. SEAS 3 TO 5 FT.
MON NIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
CARIBBEAN N OF 15N BETWEEN 72W AND 85W
THIS AFTERNOON
E WINDS 10 TO 20 KT S OF 18N, AND SE LESS THAN
10 KT ELSEWHERE. SEAS 3 TO 5 FT.
TONIGHT
S OF 18N, E WINDS 10 TO 20 KT, SEAS 3 TO 5 FT.
ELSEWHERE, E WINDS LESS THAN 10 KT, INCREASING TO 10 TO 15 KT
AFTER MIDNIGHT,SEAS 3 FT IN THE EVENING, SUBSIDING TO 2 FT OR
LESS.
FRI
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 2 FT OR LESS ELSEWHERE.
FRI NIGHT
E WINDS 10 TO 15 KT S OF 18N, AND E LESS THAN 10 KT
ELSEWHERE. S OF 18N, SEAS 4 TO 6 FT. ELSEWHERE, SEAS 2 FT OR
LESS, BUILDING TO 3 TO 4 FT AFTER MIDNIGHT.
SAT
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
SAT NIGHT
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
SUN
E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT.
SUN NIGHT
E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT.
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.
CARIBBEAN FROM 11N TO 15N W OF 72W
THIS AFTERNOON
E WINDS 15 TO 25 KT WITHIN 90 NM OF COAST OF
COLOMBIA, AND E 10 TO 20 KT ELSEWHERE. SEAS 4 TO 6 FT.
TONIGHT
E WINDS 15 TO 25 KT WITHIN 90 NM OF COAST OF
COLOMBIA, AND E 10 TO 20 KT ELSEWHERE. SEAS 4 TO 6 FT.
FRI
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.
FRI NIGHT
E WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
SAT
E WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
SAT NIGHT
E WINDS 10 TO 20 KT. SEAS 4 TO 5 FT.
SUN
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
SUN NIGHT
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
MON
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
MON NIGHT
E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT.
SW CARIBBEAN S OF 11N
THIS AFTERNOON
NE WINDS 10 TO 15 KT, DIMINISHING TO LESS THAN
10 KT IN THE AFTERNOON. SEAS 3 TO 5 FT.
TONIGHT
NW WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
FRI
NW WINDS LESS THAN 10 KT, SHIFTING TO SW IN THE
AFTERNOON. SEAS 4 TO 6 FT.
FRI NIGHT
W WINDS LESS THAN 10 KT. SEAS 4 TO 6 FT.
SAT
W WINDS LESS THAN 10 KT, SHIFTING TO SE IN THE AFTERNOON.
SEAS 3 TO 5 FT.
SAT NIGHT
SW WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
SUN
SW WINDS LESS THAN 10 KT IN THE MORNING, BECOMING
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
SUN NIGHT
N WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
MON
W WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
MON NIGHT
NW WINDS LESS THAN 10 KT, SHIFTING TO N AFTER
MIDNIGHT. SEAS 4 TO 6 FT.
CARIBBEAN BETWEEN 64W AND 72W
THIS AFTERNOON
E WINDS 15 TO 20 KT GULF OF VENEZUELA, AND E
10 TO 20 KT ELSEWHERE. SEAS 4 TO 6 FT.
TONIGHT
E WINDS 15 TO 25 KT GULF OF VENEZUELA, AND E 10 TO
20 KT ELSEWHERE. SEAS 4 TO 6 FT.
FRI
E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT GULF OF VENEZUELA,
AND 4 TO 6 FT ELSEWHERE.
FRI NIGHT
NE WINDS 10 TO 20 KT GULF OF VENEZUELA, AND E 10 TO
15 KT ELSEWHERE. SEAS 3 TO 5 FT.
SAT
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
SAT NIGHT
E WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
SUN
E WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
SUN NIGHT
E WINDS 10 TO 20 KT. SEAS 4 TO 6 FT.
MON
E WINDS 10 TO 20 KT. SEAS 5 TO 6 FT.
MON 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
THIS AFTERNOON
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TONIGHT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
FRI
SE WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
FRI NIGHT
SE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
SAT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
SAT NIGHT
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 6 TO 9 FT.
MON
E WINDS 10 TO 15 KT. SEAS 6 TO 9 FT.
MON NIGHT
E WINDS 10 TO 15 KT. SEAS 6 TO 8 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
SE WINDS LESS THAN 10 KT, INCREASING TO 10 TO 15 KT
AFTER MIDNIGHT. SEAS 3 TO 5 FT.
FRI
SE WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
FRI NIGHT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
SAT
E WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
SAT NIGHT
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.
SYNOPSIS FOR THE THE SW N ATLANTIC INCLUDING THE BAHAMAS
SYNOPSIS
HURRICANE ERIN IS CENTERED N OF THE AREA NEAR 35.4N
70.9W AT 11 AM EDT, MOVING NORTH-NORTHEAST AT 16 KT. MAXIMUM
SUSTAINED WINDS ARE 85 KT WITH GUSTS TO 105 KT, AND THE MINIMUM
CENTRAL PRESSURE IS 952 MB. ERIN WILL CONTINUE TO MOVE NNE FAR
AWAY FROM THE REGION THROUGH THE END OF THE WEEK WHILE SLOWLY
WEAKENING. LONG PERIOD NORTHERLY SWELLS GENERATED BY ERIN WILL
AFFECT JUST ABOUT THE ENTIRE FORECAST AREA THROUGH THE NEXT FEW
DAYS. IN THE WAKE OF ERIN, CENTRAL ATLANTIC HIGH PRESSURE WILL
BUILD WSW TOWARD THE CENTRAL BAHAMAS AND THE STRAITS OF FLORIDA
THROUGH THE PERIOD. AN AREA OF SHOWERS AND THUNDERSTORMS
ASSOCIATED WITH A TROPICAL WAVE LOCATED A FEW HUNDRED MILES EAST
OF THE LEEWARD ISLANDS HAS CHANGED LITTLE OVER THE PAST SEVERAL
HOURS. ENVIRONMENTAL CONDITIONS APPEAR CONDUCIVE FOR FURTHER
DEVELOPMENT OF THIS SYSTEM, AND A TROPICAL DEPRESSION IS LIKELY
TO FORM THIS WEEKEND WHILE IT MOVES NEAR OR TO THE NORTH OF THE
NORTHERN LEEWARD ISLANDS.
ATLC WATERS FROM 27N TO 31N W OF 77W
THIS AFTERNOON
W WINDS 10 TO 15 KT. SEAS 8 TO 13 FT.
TONIGHT
SW WINDS LESS THAN 10 KT. SEAS 7 TO 10 FT.
FRI
W WINDS LESS THAN 10 KT. SEAS 6 TO 9 FT.
FRI NIGHT
VARIABLE WINDS LESS THAN 10 KT. SEAS 6 TO 9 FT.
SAT
SW WINDS LESS THAN 10 KT. SEAS 6 TO 8 FT.
SAT NIGHT
SW WINDS LESS THAN 10 KT. SEAS 5 TO 7 FT.
SUN
W WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
SUN NIGHT
W WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
MON
W WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
MON NIGHT
W WINDS LESS THAN 10 KT. SEAS 4 TO 6 FT.
ATLC WATERS FROM 27N TO 31N BETWEEN 65W AND 77W
THIS AFTERNOON
W WINDS 15 TO 25 KT W OF 70W, AND SW 20 TO
30 KT ELSEWHERE. SEAS 13 TO 18 FT.
TONIGHT
W WINDS 10 TO 20 KT W OF 70W, AND SW 15 TO 25 KT
ELSEWHERE. SEAS 10 TO 15 FT.
FRI
W OF 70W, W WINDS 10 TO 15 KT, DIMINISHING TO LESS THAN
10 KT IN THE AFTERNOON. ELSEWHERE, SW WINDS 10 TO 20 KT. SEAS
8 TO 13 FT.
FRI NIGHT
W OF 70W, NW WINDS LESS THAN 10 KT IN THE EVENING,
BECOMING VARIABLE WINDS LESS THAN 10 KT. ELSEWHERE, W WINDS
10 TO 15 KT. SEAS 8 TO 12 FT.
SAT
VARIABLE WINDS LESS THAN 10 KT. SEAS 8 TO 12 FT.
SAT NIGHT
VARIABLE WINDS LESS THAN 10 KT, BECOMING S LESS
THAN 10 KT AFTER MIDNIGHT. SEAS 8 TO 11 FT.
SUN
S WINDS LESS THAN 10 KT, SHIFTING TO SW IN THE AFTERNOON.
SEAS 7 TO 10 FT.
SUN NIGHT
SW WINDS 10 TO 15 KT. SEAS 7 TO 8 FT.
MON
SW WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
MON NIGHT
SW WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
BAHAMAS N OF 22N
THIS AFTERNOON
SW WINDS LESS THAN 10 KT. SEAS 4 TO 6 FT.
TONIGHT
W WINDS LESS THAN 10 KT, SHIFTING TO S AFTER
MIDNIGHT. SEAS 3 TO 5 FT.
FRI
SW WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
FRI NIGHT
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
SAT
VARIABLE WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
SAT NIGHT
VARIABLE WINDS LESS THAN 10 KT, BECOMING SE LESS
THAN 10 KT AFTER MIDNIGHT. SEAS 3 TO 5 FT.
SUN
S 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
SE WINDS LESS THAN 10 KT. SEAS 3 TO 4 FT.
ATLC WATERS FROM 22N TO 27N BETWEEN 65W AND THE BAHAMAS
THIS AFTERNOON
S WINDS 10 TO 15 KT. SEAS 7 TO 10 FT.
TONIGHT
S WINDS 10 TO 15 KT W OF 70W, AND SE LESS THAN 10 KT
ELSEWHERE. SEAS 6 TO 9 FT.
FRI
S WINDS LESS THAN 10 KT. SEAS 6 TO 8 FT.
FRI NIGHT
W WINDS LESS THAN 10 KT IN THE EVENING, BECOMING
VARIABLE WINDS LESS THAN 10 KT. SEAS 6 TO 8 FT.
SAT
VARIABLE WINDS LESS THAN 10 KT. SEAS 7 TO 9 FT.
SAT NIGHT
VARIABLE WINDS LESS THAN 10 KT. SEAS 7 TO 9 FT.
SUN
S WINDS LESS THAN 10 KT. SEAS 7 TO 9 FT.
SUN NIGHT
S WINDS LESS THAN 10 KT. SEAS 7 TO 8 FT.
MON
S WINDS 10 KT. SEAS 6 TO 7 FT.
MON NIGHT
SE WINDS LESS THAN 10 KT. SEAS 6 TO 7 FT.
ATLC WATERS S OF 22N W OF 65W
THIS AFTERNOON
SE WINDS 10 TO 15 KT. SEAS 4 TO 6 FT.
TONIGHT
E WINDS LESS THAN 10 KT, INCREASING TO 10 TO 15 KT
AFTER MIDNIGHT. SEAS 3 TO 5 FT.
FRI
E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT.
FRI NIGHT
E WINDS LESS THAN 10 KT. SEAS 3 TO 5 FT.
SAT
E WINDS LESS THAN 10 KT. SEAS 4 TO 6 FT.
SAT NIGHT
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
SUN
E WINDS 10 TO 15 KT, DIMINISHING TO LESS THAN 10 KT IN
THE AFTERNOON. SEAS 5 TO 7 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 15 KT. SEAS 5 TO 7 FT.
ATLC WATERS FROM 19N TO 22N BETWEEN 55W AND 65W
THIS AFTERNOON
E WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
TONIGHT
E WINDS 10 TO 15 KT. SEAS 6 TO 7 FT.
FRI
E WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
FRI NIGHT
SE WINDS 10 TO 15 KT. SEAS 5 TO 7 FT.
SAT
SE WINDS 10 TO 15 KT. SEAS 6 TO 7 FT.
SAT NIGHT
SE WINDS LESS THAN 10 KT, INCREASING TO 10 TO 15 KT
AFTER MIDNIGHT. SEAS 6 TO 8 FT.
SUN
E WINDS 10 TO 15 KT. SEAS 6 TO 8 FT.
SUN NIGHT
E WINDS 10 TO 15 KT. SEAS 7 TO 8 FT.
MON
E WINDS 10 TO 15 KT. SEAS 8 FT.
MON NIGHT
E WINDS 10 TO 15 KT. SEAS 7 TO 8 FT.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page