601
FZUS52 KKEY 091429
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1029 AM EDT Tue Sep 9 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.

GMZ005-100230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1029 AM EDT Tue Sep 9 2025

.SYNOPSIS...A surface trough stretching across the Florida
Peninsula will shift northward and weaken over the next couple of
days. This will result in light south to southwesterly breezes
across Keys waters. Diurnal influences, the weak flow, and
convective influences will likely result in variable stretches.
Nebulous flow will give way to light to gentle broadly
northeasterly breezes through the back half of the week as a
frontal boundary sags southward down the Florida Peninsula.

The Approximate Shoreward Edge of the Gulf Stream as of September 1...

41 NM South of Dry Tortugas Light...on Loggerhead Key.
30 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
 9 NM South of Sand Key Light...off Key West.
 8 NM South of Looe Key...off Big Pine Key.
 7 NM Southeast of Sombrero Key Light...off Marathon.
 6 NM Southeast of Alligator Reef Light...off Islamorada.
 4 NM Southeast of Molasses Reef Light...off Key Largo.
 4 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.

$$

GMZ031-100230-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1029 AM EDT Tue Sep 9 2025

.THIS AFTERNOON...South winds 5 to 10 knots. Bay waters smooth to
a light chop. Numerous showers and scattered thunderstorms.
.TONIGHT...South to southwest winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and thunderstorms.
.WEDNESDAY...South to southwest winds 5 to 10 knots. Bay waters
smooth to a light chop. Numerous showers and scattered
thunderstorms.
.WEDNESDAY NIGHT...Southwest to west winds 5 to 10 knots,
becoming southeast to south near 5 knots after midnight. Bay
waters smooth to a light chop, becoming smooth. Scattered showers
and thunderstorms.
.THURSDAY...Southwest winds near 5 knots. Bay waters smooth.
Numerous showers and scattered thunderstorms.
.THURSDAY NIGHT...Variable winds near 5 knots. Bay waters smooth.
Scattered showers and thunderstorms.
.FRIDAY...Southwest to west winds near 5 knots. Bay waters
smooth. Numerous showers and scattered thunderstorms.
.FRIDAY NIGHT...Northwest winds near 5 knots, becoming northeast 5
to 10 knots. Bay waters smooth, becoming smooth to a light chop.
Numerous showers and scattered thunderstorms.
.SATURDAY...North to northeast winds 5 to 10 knots. Bay waters
smooth to a light chop. Numerous showers and scattered
thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and thunderstorms.

$$

GMZ032-035-100230-
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-
1029 AM EDT Tue Sep 9 2025

.THIS AFTERNOON...South to southwest winds 5 to 10 knots. Seas 1
foot or less. Nearshore waters smooth to a light chop. Numerous
showers and scattered thunderstorms.
.TONIGHT...South to southwest winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Scattered showers
and thunderstorms.
.WEDNESDAY...South to southwest winds 5 to 10 knots. Seas 1 foot
or less. Nearshore waters smooth to a light chop. Scattered
showers and thunderstorms.
.WEDNESDAY NIGHT...Variable winds near 5 knots, becoming southeast.
Seas 1 foot or less. Nearshore waters smooth. Scattered showers
and thunderstorms.
.THURSDAY...Variable winds near 5 knots, becoming west to
northwest. Seas 1 foot or less. Nearshore waters smooth.
Scattered showers and thunderstorms.
.THURSDAY NIGHT...Winds becoming variable near 5 knots. Seas 1
foot or less. Nearshore waters smooth. Scattered showers and
thunderstorms.
.FRIDAY...West to northwest winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Numerous showers
and scattered thunderstorms.
.FRIDAY NIGHT...North winds 5 to 10 knots, becoming northeast.
Seas 1 foot or less. Nearshore waters smooth to a light chop.
Numerous showers and scattered thunderstorms.
.SATURDAY...North to northeast winds 5 to 10 knots. Seas 1 foot
or less. Nearshore waters smooth to a light chop. Numerous
showers and scattered thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Scattered showers
and thunderstorms.

$$

GMZ042>044-100230-
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-
1029 AM EDT Tue Sep 9 2025

.THIS AFTERNOON...South to southwest winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and thunderstorms.
.TONIGHT...South to southwest winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Scattered
showers and thunderstorms.
.WEDNESDAY...South to southwest winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Scattered
showers and thunderstorms.
.WEDNESDAY NIGHT...Variable winds near 5 knots. Seas around 1
foot. Nearshore waters smooth. Scattered showers and
thunderstorms.
.THURSDAY...Variable winds near 5 knots. Seas around 1 foot.
Nearshore waters smooth. Scattered showers and thunderstorms.
.THURSDAY NIGHT...Variable winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and
thunderstorms.
.FRIDAY...Variable winds near 5 knots, becoming northwest. Seas 1
foot or less. Nearshore waters smooth. Numerous showers and
scattered thunderstorms.
.FRIDAY NIGHT...Northwest to north 5 to 10 knots, becoming
northeast. Seas 1 foot or less. Nearshore waters smooth to a
light chop. Numerous showers and scattered thunderstorms.
.SATURDAY...North to northeast winds 5 to 10 knots. Seas 1 foot
or less. Nearshore waters smooth, becoming a light chop. Scattered
showers and thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Numerous showers
and scattered thunderstorms.

$$

GMZ052>055-072>075-100230-
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-
1029 AM EDT Tue Sep 9 2025

.THIS AFTERNOON...South to southwest winds 5 to 10 knots. Seas
around 1 foot. Wave Detail: Southeast to south 1 foot at 3
seconds. Scattered showers and thunderstorms.
.TONIGHT...South winds 5 to 10 knots. Seas around 1 foot. Wave
Detail: Southeast 1 foot at 3 seconds. Scattered showers and
thunderstorms.
.WEDNESDAY...South winds 5 to 10 knots, becoming variable. Seas 1
to 2 feet. Wave Detail: Southeast 1 foot at 3 seconds. Scattered
showers and thunderstorms.
.WEDNESDAY NIGHT...Variable winds 5 to 10 knots, becoming southeast
after midnight. Seas 1 to 2 feet. Scattered showers and
thunderstorms.
.THURSDAY...Variable winds 5 to 10 knots. Seas 1 to 2 feet.
Scattered showers and thunderstorms.
.THURSDAY NIGHT...Variable winds 5 to 10 knots. Seas 1 to 2 feet.
Scattered showers and thunderstorms.
.FRIDAY...Variable winds 5 to 10 knots, becoming northwest. Seas
around 1 foot. Scattered showers and thunderstorms.
.FRIDAY NIGHT...Northwest to north winds 5 to 10 knots, becoming
northeast. Seas 1 to 2 feet. Numerous showers and scattered
thunderstorms.
.SATURDAY...Winds becoming north to northeast 5 to 10 knots. Seas
1 to 2 feet. Numerous showers and scattered thunderstorms.
.SATURDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
1 to 2 feet. Numerous showers and scattered thunderstorms.

$$

GMZ033-034-100230-
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-
1029 AM EDT Tue Sep 9 2025

.THIS AFTERNOON...Southwest winds 5 to 10 knots. Seas 1 to 2
feet. Wave Detail: South to southwest 1 foot at 3 seconds.
Numerous showers and scattered thunderstorms.
.TONIGHT...South to southwest winds 5 to 10 knots. Seas 1 to
2 feet. Wave Detail: South to southwest 1 foot at 4 seconds and
northwest 1 foot at 6 seconds. Scattered showers and
thunderstorms.
.WEDNESDAY...South winds 5 to 10 knots, becoming southwest. Seas
around 1 foot. Wave Detail: Southwest 1 foot at 4 seconds.
Scattered showers and thunderstorms.
.WEDNESDAY NIGHT...West to northwest winds near 5 knots, becoming
south after midnight. Seas around 1 foot. Scattered showers and
thunderstorms.
.THURSDAY...Variable winds near 5 knots, becoming northwest to
north. Seas around 1 foot. Scattered showers and thunderstorms.
.THURSDAY NIGHT...Northwest to north winds 5 to 10 knots. Seas
around 1 foot. Scattered showers and thunderstorms.
.FRIDAY...Northwest to north winds 5 to 10 knots. Seas around
1 foot. Numerous showers and scattered thunderstorms.
.FRIDAY NIGHT...North to northeast winds 5 to 10 knots. Seas 1 to
2 feet. Numerous showers and scattered thunderstorms.
.SATURDAY...Winds becoming northeast 5 to 10 knots. Seas 1 to 2
feet. Scattered showers and thunderstorms.
.SATURDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
1 to 2 feet. Scattered showers and thunderstorms.

$$