355
FZUS52 KKEY 290822
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
422 AM EDT Fri Aug 29 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.

GMZ005-292030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
422 AM EDT Fri Aug 29 2025

.SYNOPSIS...An early season Canadian high pressure system will
continue to traverse across the eastern United States and move
into the Atlantic over the next few days. This will allow for
breezes to remain light through the weekend. Pressure gradient
across the Gulf including Florida and the Florida Keys will
increase early next week, resulting in freshening breezes.
Moisture will increase as well, supporting higher shower and
thunderstorm coverage through early next 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.

$$

GMZ031-292030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
422 AM EDT Fri Aug 29 2025

.TODAY...Southeast winds near 5 knots. Bay waters smooth.
Bay waters rough, and winds higher in and around scattered
showers and thunderstorms.
.TONIGHT...East to southeast winds 5 to 10 knots, becoming
southeast to south after midnight. Bay waters smooth to a light
chop. Scattered showers and thunderstorms.
.SATURDAY...South to southwest winds near 5 knots, increasing to 5
to 10 knots. Bay waters smooth, becoming smooth to a light chop.
Scattered showers and thunderstorms.
.SATURDAY NIGHT...West to northwest winds 5 to 10 knots. Bay
waters smooth. Scattered showers and thunderstorms.
.SUNDAY...Southwest to west winds 5 to 10 knots, becoming west to
northwest near 10 knots in the afternoon. Bay waters smooth to a
light chop, becoming a light chop. Scattered showers and
thunderstorms.
.SUNDAY NIGHT...Northwest winds near 10 knots. Bay waters a light
chop. Scattered showers and thunderstorms.
.MONDAY...West to northwest winds near 10 knots. Bay waters a
light chop. Scattered showers and thunderstorms.
.MONDAY NIGHT...West to northwest winds near 10 knots. Bay waters
a light chop. Scattered showers and thunderstorms.
.TUESDAY...West winds 10 to 15 knots. Bay waters a light to
moderate chop. Scattered showers and thunderstorms.
.TUESDAY NIGHT...Southwest to west winds 10 to 15 knots. Bay
waters a light to moderate chop. Scattered showers and
thunderstorms.

$$

GMZ032-035-292030-
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-
422 AM EDT Fri Aug 29 2025

.TODAY...East to southeast winds near 5 knots, becoming variable.
Seas 1 foot or less. Nearshore waters smooth. Winds and seas
higher in and around scattered showers and thunderstorms.
.TONIGHT...Variable winds near 5 knots, becoming southeast to
south 5 to 10 knots after midnight. Seas 1 foot or less.
Nearshore waters smooth, becoming smooth to a light chop.
Scattered showers and thunderstorms.
.SATURDAY...South to southwest winds 5 to 10 knots, becoming
southwest to west. Seas 1 foot or less. Nearshore waters smooth to
a light chop. Scattered showers and thunderstorms.
.SATURDAY NIGHT...West to northwest winds 5 to 10 knots, becoming
southwest to west. Seas 1 foot or less. Nearshore waters smooth to
a light chop. Scattered showers and thunderstorms.
.SUNDAY...Southwest to west winds 5 to 10 knots, becoming west to
northwest near 10 knots. Seas building to around 1 foot.
Nearshore waters smooth to a light chop, becoming a light chop.
Scattered showers and thunderstorms.
.SUNDAY NIGHT...Northwest winds near 10 knots, decreasing to 5 to
10 knots. Seas around 1 foot. Nearshore waters a light chop,
becoming smooth to a light chop. Scattered showers and
thunderstorms.
.MONDAY...West to northwest winds increasing to near 10 knots.
Seas around 1 foot. Nearshore waters becoming a light chop.
Scattered showers and thunderstorms.
.MONDAY NIGHT...West to northwest winds near 10 knots. Seas
around 1 foot. Nearshore waters a light chop. Scattered showers
and thunderstorms.
.TUESDAY...West winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore
waters a light to moderate chop. Scattered showers and
thunderstorms.
.TUESDAY NIGHT...Southwest to west winds 10 to 15 knots. Seas 1
to 2 feet. Nearshore waters a light to moderate chop. Scattered
showers and thunderstorms.

$$

GMZ042>044-292030-
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-
422 AM EDT Fri Aug 29 2025

.TODAY...Southeast winds near 5 knots, becoming east to southeast.
Seas around 1 foot. Nearshore waters smooth. Winds and seas
higher in and around scattered showers and thunderstorms
.TONIGHT...Northeast to east winds 5 to 10 knots, becoming
southeast to south after midnight. Seas around 1 foot. Nearshore
waters smooth to a light chop. Scattered showers and
thunderstorms.
.SATURDAY...South to southwest winds 5 to 10 knots, becoming
southwest to west. Seas around 1 foot. Nearshore waters smooth to
a light chop. Scattered showers and thunderstorms.
.SATURDAY NIGHT...West to northwest winds 5 to 10 knots, becoming
southwest to west. Seas around 1 foot. Nearshore waters smooth to
a light chop. Scattered showers and thunderstorms.
.SUNDAY...Southwest to west winds 5 to 10 knots, becoming west to
northwest near 10 knots. Seas around 1 foot. Nearshore waters
smooth to a light chop, becoming a light chop. Scattered showers
and thunderstorms.
.SUNDAY NIGHT...Northwest winds near 10 knots, decreasing to 5 to
10 knots. Seas around 1 foot. Nearshore waters a light chop,
becoming smooth to a light chop. Scattered showers and
thunderstorms.
.MONDAY...West to northwest winds increasing to near 10 knots.
Seas around 1 foot. Nearshore waters becoming a light chop.
Scattered showers and thunderstorms.
.MONDAY NIGHT...West to northwest winds near 10 knots. Seas
around 1 foot. Nearshore waters a light chop. Scattered showers
and thunderstorms.
.TUESDAY...West winds 10 to 15 knots. Seas building to 1 to 2
feet. Nearshore waters a light to moderate chop. Scattered showers
and thunderstorms.
.TUESDAY NIGHT...Southwest to west winds 10 to 15 knots. Seas 1
to 3 feet. Nearshore waters a light to moderate chop. Scattered
showers and thunderstorms.

$$

GMZ052>055-072>075-292030-
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-
422 AM EDT Fri Aug 29 2025

.TODAY...East to southeast winds 5 to 10 knots, becoming
northeast to east late. Seas 1 to 2 feet. Wave Detail: East to
southeast 2 feet at 4 seconds. Winds and seas higher in and
around scattered showers and thunderstorms
.TONIGHT...Northeast to east winds 5 to 10 knots, becoming
southeast to south after midnight. Seas 1 to 2 feet, subsiding to
around 1 foot. Wave Detail: East 1 foot at 4 seconds. Scattered
showers and thunderstorms.
.SATURDAY...South to southwest winds 5 to 10 knots, becoming
southwest to west. Seas around 1 foot. Wave Detail: Southeast 1
foot at 3 seconds. Scattered showers and thunderstorms.
.SATURDAY NIGHT...West to northwest winds 5 to 10 knots, becoming
south to southwest. Seas around 1 foot. Scattered showers and
thunderstorms.
.SUNDAY...Southwest to west winds 5 to 10 knots, becoming west to
northwest near 10 knots. Seas around 1 foot. Scattered showers
and thunderstorms.
.SUNDAY NIGHT...Northwest winds near 10 knots. Seas around 1
foot. Scattered showers and thunderstorms.
.MONDAY...West winds near 10 knots, becoming west to northwest.
Seas around 1 foot. Scattered showers and thunderstorms.
.MONDAY NIGHT...West to northwest winds near 10 knots. Seas
around 1 foot. Scattered showers and thunderstorms.
.TUESDAY...Southwest to west winds 10 to 15 knots. Seas 1 to 2
feet. Scattered showers and thunderstorms.
.TUESDAY NIGHT...West winds 10 to 15 knots. Seas building to 2 to
3 feet. Scattered showers and thunderstorms.

$$

GMZ033-034-292030-
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-
422 AM EDT Fri Aug 29 2025

.TODAY...East to southeast winds near 5 knots, becoming variable.
Seas 1 foot or less. Wave Detail: East to southeast 1 foot at 2
seconds. Winds and seas higher in and around scattered showers
and thunderstorms
.TONIGHT...Variable winds 5 to 10 knots, becoming southeast to
south after midnight. Seas building to around 1 foot. Scattered
showers and thunderstorms.
.SATURDAY...South to southwest winds 5 to 10 knots, becoming
southwest to west. Seas around 1 foot. Wave Detail: Northwest 1
foot at 2 seconds. Scattered showers and thunderstorms.
.SATURDAY NIGHT...West to northwest winds 5 to 10 knots, becoming
southwest to west. Seas around 1 foot. Scattered showers and
thunderstorms.
.SUNDAY...Southwest to west winds 5 to 10 knots, becoming west to
northwest near 10 knots. Seas around 1 foot. Scattered showers
and thunderstorms.
.SUNDAY NIGHT...West to northwest winds near 10 knots. Seas
around 1 foot. Scattered showers and thunderstorms.
.MONDAY...West to northwest winds near 10 knots. Seas around
1 foot. Scattered showers and thunderstorms.
.MONDAY NIGHT...West to northwest winds near 10 knots. Seas
around 1 foot. Scattered showers and thunderstorms.
.TUESDAY...West winds 10 to 15 knots. Seas 1 to 2 feet, building
to around 2 feet. Scattered showers and thunderstorms.
.TUESDAY NIGHT...West winds 10 to 15 knots. Seas 2 to 3 feet.
Scattered showers and thunderstorms.

$$