803
FZUS52 KKEY 051440
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1040 AM EDT Fri Sep 5 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.

GMZ005-060245-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1040 AM EDT Fri Sep 5 2025

.SYNOPSIS...A surface trough will remain draped across South and
Central Florida over the next couple of days. This will keep winds
gentle and very broadly south to southwesterly. A moderate wind
surge is possible this afternoon and evening on waters near Key
Largo. The band of heightened shower and thunderstorm potential
will remain across our waters. An Atlantic ridge will lift
northward out of Cuba into the Keys and South Florida this
weekend. This will weaken and back winds southerly. With that
said, expect wind direction to be chaotic at times. Shower and
thunderstorm coverage will likely remain above normal.

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.

$$

GMZ031-060245-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1040 AM EDT Fri Sep 5 2025

.THIS AFTERNOON...Southwest winds near 10 knots, increasing to 10
to 15 knots. Bay waters a light chop, becoming a light to
moderate chop. Winds higher and bay waters rough near widespread
showers and scattered thunderstorms.
.TONIGHT...South to southwest winds decreasing to near 10 knots.
Bay waters becoming a light chop. Widespread showers and
scattered thunderstorms.
.SATURDAY...South to southwest winds near 10 knots. Bay waters a
light chop. Numerous showers and scattered thunderstorms.
.SATURDAY NIGHT...South to southwest winds near 5 knots. Bay
waters smooth. Scattered showers and thunderstorms.
.SUNDAY...South to southwest winds 5 to 10 knots. Bay waters
smooth to a light chop. Numerous showers and scattered
thunderstorms.
.SUNDAY NIGHT...South winds near 5 knots. Bay waters smooth.
Scattered showers and thunderstorms.
.MONDAY...Southeast to south winds 5 to 10 knots. Bay waters
smooth to a light chop. Numerous showers and scattered
thunderstorms.
.MONDAY NIGHT...Southeast winds 5 to 10 knots. Bay waters smooth
to a light chop. Scattered showers and thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and thunderstorms.
.TUESDAY NIGHT...Southeast winds 5 to 10 knots. Bay waters smooth
to a light chop. Scattered showers and thunderstorms.

$$

GMZ032-035-060245-
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-
1040 AM EDT Fri Sep 5 2025

.THIS AFTERNOON...Southwest winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. Wind and seas higher near
widespread showers and scattered thunderstorms.
.TONIGHT...South to southwest winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop. Widespread
showers and scattered thunderstorms.
.SATURDAY...South to southwest winds decreasing to 5 to 10 knots.
Seas subsiding to 1 foot or less. Nearshore waters becoming
smooth to a light chop. Numerous showers and scattered
thunderstorms.
.SATURDAY NIGHT...South to southwest winds 5 to 10 knots. Seas
1 foot or less. Nearshore waters smooth to a light chop.
Scattered showers and thunderstorms.
.SUNDAY...Southwest winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and thunderstorms.
.SUNDAY NIGHT...South to southwest winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. Scattered showers and
thunderstorms.
.MONDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
1 foot or less. Nearshore waters smooth to a light chop.
Scattered showers and thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Scattered showers
and thunderstorms.
.TUESDAY NIGHT...Southeast winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Scattered showers
and thunderstorms.

$$

GMZ042>044-060245-
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-
1040 AM EDT Fri Sep 5 2025

.THIS AFTERNOON...Southwest winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop. Winds and seas
higher near widespread showers and scattered thunderstorms.
.TONIGHT...South to southwest winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop. Widespread
showers and scattered thunderstorms.
.SATURDAY...South to southwest winds decreasing to 5 to 10 knots.
Seas subsiding to around 1 foot. Nearshore waters becoming
smooth to a light chop. Numerous showers and scattered
thunderstorms.
.SATURDAY NIGHT...South to southwest winds near 5 knots. Seas
around 1 foot. Nearshore waters smooth. Scattered showers and
thunderstorms.
.SUNDAY...Southwest winds near 5 knots. Seas around 1 foot.
Nearshore waters smooth. Scattered showers and thunderstorms.
.SUNDAY NIGHT...Variable winds near 5 knots, becoming southeast to
south. Seas 1 foot or less. Nearshore waters smooth. Scattered
showers and thunderstorms.
.MONDAY...Southeast to south winds near 5 knots. Seas around
1 foot. Nearshore waters smooth. Scattered showers and
thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Scattered
showers and thunderstorms.
.TUESDAY NIGHT...Southeast winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Scattered
showers and thunderstorms.

$$

GMZ052>055-072>075-060245-
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-
1040 AM EDT Fri Sep 5 2025

.THIS AFTERNOON...Southwest winds 10 to 15 knots. Seas around 2
feet. Wave Detail: Southwest to west 2 feet at 5 seconds. Winds
and seas higher near widespread showers and scattered
thunderstorms.
.TONIGHT...South to southwest winds 10 to 15 knots. Seas 1 to
2 feet. Wave Detail: Southwest to west 2 feet at 5 seconds.
Numerous showers and scattered thunderstorms.
.SATURDAY...South to southwest winds decreasing to 5 to 10 knots.
Seas 1 to 2 feet. Wave Detail: South to southwest 1 foot at 4
seconds. Scattered showers and thunderstorms.
.SATURDAY NIGHT...South winds near 5 knots. Seas around 1 foot.
Scattered showers and thunderstorms.
.SUNDAY...Southwest winds near 5 knots. Seas around 1 foot.
Scattered showers and thunderstorms.
.SUNDAY NIGHT...Variable winds near 5 knots, becoming southeast
to south. Seas around 1 foot. Scattered showers and
thunderstorms.
.MONDAY...Southeast to south winds 5 to 10 knots, becoming east
in the afternoon. Seas around 1 foot. Scattered showers and
thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Scattered showers and thunderstorms.
.TUESDAY...Southeast winds 5 to 10 knots. Seas around 1 foot.
Scattered showers and thunderstorms.
.TUESDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Scattered showers and thunderstorms.

$$

GMZ033-034-060245-
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-
1040 AM EDT Fri Sep 5 2025

.THIS AFTERNOON...Southwest winds near 10 knots. Seas around 2
feet. Wave Detail: Southwest to west 2 feet at 5 seconds. Winds
and seas higher near widespread showers and scattered
thunderstorms.
.TONIGHT...South to southwest winds increasing to 10 to 15 knots.
Seas around 2 feet. Wave Detail: Southwest 2 feet at 5 seconds.
Widespread showers and scattered thunderstorms.
.SATURDAY...Southwest winds 5 to 10 knots. Seas 1 to 2 feet. Wave
Detail: Southwest 2 feet at 4 seconds. Numerous showers and
scattered thunderstorms.
.SATURDAY NIGHT...South to southwest winds 5 to 10 knots. Seas
1 to 2 feet. Scattered showers and thunderstorms.
.SUNDAY...Southwest to west winds 5 to 10 knots. Seas around
1 foot. Scattered showers and thunderstorms.
.SUNDAY NIGHT...West winds near 5 knots, becoming south to
southwest. Seas around 1 foot. Scattered showers and
thunderstorms.
.MONDAY...Southwest winds near 5 knots. Seas around 1 foot.
Scattered showers and thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Numerous showers and scattered thunderstorms.
.TUESDAY...Southeast to south winds near 5 knots. Seas around
1 foot. Scattered showers and thunderstorms.
.TUESDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Numerous showers and scattered thunderstorms.

$$