581
FZUS52 KKEY 240823
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
423 AM EDT Sun Aug 24 2025

Florida Bay, Hawk Channel and Straits of Florida from Ocean Reef
to south of Dry Tortugas, and the extreme southeastern Gulf of
America, including The Florida Keys National Marine Sanctuary

Seas are 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.

Wave Detail will include details about the period and direction
of origin for the highest energy waves. Long-period swells coming
from a different direction than the wind would be included in the
Wave Detail.

GMZ005-242030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
423 AM EDT Sun Aug 24 2025

.SYNOPSIS...A weak subtropical high pressure ridge will remain
over the Keys through early to mid week. This will result in
generally light breezes, occasionally becoming light to gentle as
well as variable at times. Towards the latter half of the week,
the ridge over the Atlantic will strengthen slightly combined with
a tropical wave moving through the northwest Caribbean Sea. This
will lend to a slight freshening of the breezes to becoming more
light to gentle and even gentle to moderate breezes at times.
Also, increasing moisture is expected to lead to more widespread
showers and thunderstorms, especially late week.

The Approximate Shoreward Edge of the Gulf Stream as of August 21...

20 NM South of Dry Tortugas Light...on Loggerhead Key.
 9 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
 9 NM South of Sand Key Light...off Key West.
13 NM South of Looe Key...off Big Pine Key.
17 NM Southeast of Sombrero Key Light...off Marathon.
17 NM Southeast of Alligator Reef Light...off Islamorada.
13 NM Southeast of Molasses Reef Light...off Key Largo.
 5 NM Southeast of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the National Weather Service in
Key West based on products from NASA SPoRT.

$$

GMZ031-242030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
423 AM EDT Sun Aug 24 2025

.TODAY...South to southwest winds 5 to 10 knots, becoming
southwest. Bay waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.TONIGHT...Southwest to west winds near 5 knots, becoming variable
after midnight. Bay waters smooth. Isolated showers and
thunderstorms.
.MONDAY...South to southwest winds near 5 knots. Bay waters
smooth. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...Variable winds near 5 knots, becoming northeast to
east after midnight. Bay waters smooth. Isolated showers and
thunderstorms.
.TUESDAY...Northeast to east winds near 5 knots, becoming east to
southeast. Bay waters smooth. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots, becoming
east. Bay waters smooth. Scattered showers and isolated
thunderstorms.
.WEDNESDAY...East winds near 5 knots. Bay waters smooth.
Scattered showers and thunderstorms.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...East winds 5 to 10
knots. Bay waters smooth to a light chop. Scattered showers and
thunderstorms.

$$

GMZ032-035-242030-
Bayside and Gulfside from Craig Key to west end of Seven Mile
Bridge-
Gulf of America from west end of Seven Mile Bridge to Halfmoon
Shoal out to 5 Fathoms-
423 AM EDT Sun Aug 24 2025

.TODAY...Southeast to south winds 5 to 10 knots, becoming south
to southwest. Seas around 1 foot. Nearshore waters smooth to a
light chop. Scattered showers and isolated thunderstorms.
.TONIGHT...Southwest to west winds near 5 knots, becoming variable
after midnight. Seas 1 foot or less. Nearshore waters smooth.
Isolated showers and thunderstorms.
.MONDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Isolated showers and thunderstorms.
.MONDAY NIGHT...Variable winds near 5 knots, becoming northeast to
east after midnight. Seas 1 foot or less. Nearshore waters
smooth. Isolated showers and thunderstorms.
.TUESDAY...Northeast to east winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...Northeast to east winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. Scattered showers and
isolated thunderstorms.
.WEDNESDAY...Northeast to east winds 5 to 10 knots. Seas 1 foot
or less, except around 1 foot west of the Marquesas Keys.
Nearshore waters smooth to a light chop. Scattered showers and
thunderstorms.
.WEDNESDAY NIGHT AND THURSDAY...East winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and thunderstorms.
.THURSDAY NIGHT...East winds near 10 knots. Seas around 1 foot,
except building to 1 to 2 feet west of the Marquesas Keys.
Nearshore waters a light chop. Scattered showers and
thunderstorms.

$$

GMZ042>044-242030-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
423 AM EDT Sun Aug 24 2025

.TODAY...Southeast to south winds near 10 knots, becoming south
to southwest and decreasing to 5 to 10 knots. Seas around 1 foot.
Nearshore waters a light chop, becoming smooth to a light chop.
Scattered showers and isolated thunderstorms.
.TONIGHT...Southwest to west winds near 5 knots, becoming variable.
Seas 1 foot or less. Nearshore waters smooth. Isolated showers
and thunderstorms.
.MONDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Isolated showers and thunderstorms.
.MONDAY NIGHT...Variable winds near 5 knots, becoming northeast to
east after midnight. Seas 1 foot or less. Nearshore waters
smooth. Isolated showers and thunderstorms.
.TUESDAY...Northeast to east winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Scattered showers and
thunderstorms.
.WEDNESDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Scattered showers and
thunderstorms.
.THURSDAY...East winds 5 to 10 knots, increasing to near 10 knots.
Seas 1 to 2 feet. Nearshore waters smooth to a light chop,
becoming a light chop. Scattered showers and thunderstorms.
.THURSDAY NIGHT...East winds near 10 knots, decreasing to 5 to 10
knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming
smooth to a light chop. Scattered showers and thunderstorms.

$$

GMZ052>055-072>075-242030-
Straits of Florida from Ocean Reef to Craig Key out 20 NM-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge out 20 NM-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal out 20 NM-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas out 20 NM-
Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge 20 to 60 NM out-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal 20 to 60 NM out-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas 20 to 60 NM out-
423 AM EDT Sun Aug 24 2025

.TODAY...Southeast to south winds near 10 knots, becoming south
to southwest and decreasing to 5 to 10 knots. Seas 1 to 2 feet.
Wave Detail: Southeast 1 foot at 3 seconds. Isolated showers and
thunderstorms.
.TONIGHT...Variable winds near 5 knots, increasing to 5 to 10
knots. Seas 1 to 2 feet. Wave Detail: East 1 foot at 3 seconds.
Scattered showers and isolated thunderstorms.
.MONDAY...East to southeast winds 5 to 10 knots, becoming
northeast to east and decreasing to near 5 knots. Seas 1 to 2
feet. Wave Detail: East to southeast 1 foot at 4 seconds. Isolated
showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas 1 to 2
feet. Isolated showers and thunderstorms.
.TUESDAY...Northeast to east winds 5 to 10 knots. Seas 1 to
2 feet. Isolated showers and thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.WEDNESDAY...East winds 5 to 10 knots, becoming northeast to east
and increasing to near 10 knots. Seas 1 to 2 feet, building to
around 2 feet. Scattered showers and thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds 10 to 15 knots,
becoming east. Seas 2 to 3 feet. Scattered showers and
thunderstorms.
.THURSDAY...East winds near 10 knots. Seas around 2 feet.
Scattered showers and thunderstorms.
.THURSDAY NIGHT...Northeast to east winds near 10 knots, becoming
east to southeast. Seas around 2 feet. Scattered showers and
thunderstorms.

$$

GMZ033-034-242030-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
423 AM EDT Sun Aug 24 2025

.TODAY...South to southwest winds 5 to 10 knots, becoming
southwest to west. Seas 1 to 2 feet. Wave Detail: Southwest 1
foot at 4 seconds. Scattered showers and isolated thunderstorms.
.TONIGHT...West winds near 5 knots, becoming variable. Seas
around 1 foot. Wave Detail: West to northwest 1 foot at 4
seconds. Scattered showers and isolated thunderstorms.
.MONDAY...Variable winds near 5 knots, becoming west. Seas around
1 foot. Wave Detail: Northwest 1 foot at 4 seconds. Isolated
showers and thunderstorms.
.MONDAY NIGHT...Northwest to north winds near 5 knots, becoming
north to northeast. Seas around 1 foot. Isolated showers and
thunderstorms.
.TUESDAY...North to northeast winds near 5 knots. Seas around
1 foot. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...Northeast winds near 5 knots. Seas around
1 foot. Scattered showers and isolated thunderstorms.
.WEDNESDAY...Northeast to east winds 5 to 10 knots. Seas 1 to 2
feet. Scattered showers and thunderstorms.
.WEDNESDAY NIGHT AND THURSDAY...Northeast to east winds 5 to 10
knots. Seas 1 to 2 feet. Scattered showers and thunderstorms.
.THURSDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet.
Scattered showers and thunderstorms.

$$

MJV