200
FZUS52 KKEY 031419
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1019 AM EDT Wed Sep 3 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.

GMZ005-040230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1019 AM EDT Wed Sep 3 2025

.SYNOPSIS...A broad surface low along a stationary front
stretching from the Gulf eastward to the Florida Peninsula will
maintain west to northwest winds across the Keys marine zones
this afternoon and tonight. The front will remain rooted in place
through the next few days, while the low meanders northeast into
the western North Atlantic promoting southwest to west breezes
throughout the week. Abundant moisture will promote above normal
rain and thunder chances through the end of the work week.

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.

$$

GMZ031-040230-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1019 AM EDT Wed Sep 3 2025

.THIS AFTERNOON...West winds near 10 knots, becoming southwest to
west. Bay waters a light chop. Winds higher and bay waters rough
in and around numerous showers and scattered thunderstorms.
.TONIGHT...Southwest to west winds near 10 knots. Bay waters a
light chop. Numerous showers and scattered thunderstorms.
.THURSDAY...Southwest to west winds 10 to 15 knots, increasing to
near 15 knots. Bay waters a light to moderate chop, becoming a
moderate chop. Widespread showers and scattered thunderstorms.
.THURSDAY NIGHT...Southwest winds 10 to 15 knots. Bay waters a
light to moderate chop. Numerous showers and scattered
thunderstorms.
.FRIDAY...Southwest winds decreasing to near 10 knots. Bay waters
becoming a light chop. Widespread showers and scattered
thunderstorms.
.FRIDAY NIGHT...Southwest winds near 10 knots. Bay waters a light
chop. Scattered showers and thunderstorms.
.SATURDAY...South to southwest winds 5 to 10 knots. Bay waters
smooth to a light chop. Numerous showers and scattered
thunderstorms.
.SATURDAY NIGHT...Southwest winds near 5 knots, becoming
southeast to south after midnight. Bay waters smooth. Scattered
showers and thunderstorms.
.SUNDAY...Southeast winds near 5 knots. Bay waters smooth.
Numerous showers and scattered thunderstorms.
.SUNDAY NIGHT...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and thunderstorms.

$$

GMZ032-035-040230-
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-
1019 AM EDT Wed Sep 3 2025

.THIS AFTERNOON...West winds near 10 knots, increasing to 10 to
15 knots. Seas around 1 foot, except building to 1 to 2 feet west
of the Marquesas Keys. Nearshore waters a light chop, becoming a
light to moderate chop. Winds and seas higher in and around
numerous showers and scattered thunderstorms.
.TONIGHT...Southwest to west winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop. Widespread
showers and scattered thunderstorms.
.THURSDAY...Southwest to west winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop. Widespread
showers and scattered thunderstorms.
.THURSDAY NIGHT...Southwest winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop. Numerous
showers and scattered thunderstorms.
.FRIDAY...Southwest to west winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop. Widespread showers and
scattered thunderstorms.
.FRIDAY NIGHT...South to southwest winds decreasing to 5 to 10
knots. Seas subsiding to around 1 foot. Nearshore waters becoming
smooth to a light chop. Scattered showers and thunderstorms.
.SATURDAY...Southwest winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Numerous showers and
scattered thunderstorms.
.SATURDAY NIGHT...Southwest to west winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Scattered
showers and thunderstorms.
.SUNDAY...Southeast winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and thunderstorms.
.SUNDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and thunderstorms.

$$

GMZ042>044-040230-
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-
1019 AM EDT Wed Sep 3 2025

.THIS AFTERNOON...West winds near 10 knots, increasing to 10 to
15 knots. Seas 1 to 2 feet. Nearshore waters a light chop,
becoming a light to moderate chop. Winds and seas higher in and
around widespread showers and scattered thunderstorms.
.TONIGHT...Southwest to west winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop. Widespread
showers and scattered thunderstorms.
.THURSDAY...Southwest to west winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop. Widespread
showers and scattered thunderstorms.
.THURSDAY NIGHT...Southwest winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop. Numerous showers
and scattered thunderstorms.
.FRIDAY...Southwest winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Numerous showers and
scattered thunderstorms.
.FRIDAY NIGHT...Southwest winds decreasing to near 10 knots. Seas
subsiding to around 1 foot. Nearshore waters becoming a light
chop. Scattered showers and thunderstorms.
.SATURDAY...Southwest winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Scattered showers and
thunderstorms.
.SATURDAY NIGHT...West winds near 5 knots, becoming variable.
Seas 1 foot or less. Nearshore waters smooth. Scattered showers
and thunderstorms.
.SUNDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and
thunderstorms.
.SUNDAY 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.

$$

GMZ052>055-072>075-040230-
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-
1019 AM EDT Wed Sep 3 2025

.THIS AFTERNOON...West winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: West 2 feet at 4 seconds. Winds and seas higher in
and around widespread showers and scattered thunderstorms.
.TONIGHT...Southwest to west winds 10 to 15 knots. Seas around 2
feet. Wave Detail: West 2 feet at 4 seconds. Numerous showers and
scattered thunderstorms.
.THURSDAY...Southwest to west winds near 15 knots. Seas 2 to 3
feet. Wave Detail: Southwest to west 2 feet at 4 seconds.
Widespread showers and scattered thunderstorms.
.THURSDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Numerous showers and scattered thunderstorms.
.FRIDAY...Southwest winds 10 to 15 knots. Seas 1 to 2 feet.
Numerous showers and scattered thunderstorms.
.FRIDAY NIGHT...South to southwest winds near 10 knots, decreasing
to 5 to 10 knots. Seas 1 to 2 feet. Scattered showers and
thunderstorms.
.SATURDAY...Southwest winds 5 to 10 knots. Seas around 1 foot.
Scattered showers and thunderstorms.
.SATURDAY NIGHT...Variable winds near 5 knots, becoming east to
southeast after midnight. Seas around 1 foot. Scattered showers
and thunderstorms.
.SUNDAY...East winds near 5 knots. Seas 1 to 2 feet. Scattered
showers and thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet.
Scattered showers and thunderstorms.

$$

GMZ033-034-040230-
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-
1019 AM EDT Wed Sep 3 2025

.THIS AFTERNOON...West winds near 10 knots. Seas 1 to 2 feet.
Wave Detail: West 1 foot at 4 seconds. Winds and seas higher in
numerous showers and scattered thunderstorms.
.TONIGHT...Southwest to west winds near 10 knots. Seas 1 to
2 feet. Wave Detail: Southwest 2 feet at 4 seconds. Widespread
showers and scattered thunderstorms.
.THURSDAY...West winds 10 to 15 knots. Seas 1 to 3 feet. Wave
Detail: Southwest to west 2 feet at 4 seconds. Widespread showers
and scattered thunderstorms.
.THURSDAY NIGHT...Southwest to west winds 10 to 15 knots. Seas
1 to 3 feet. Numerous showers and scattered thunderstorms.
.FRIDAY...Southwest to west winds decreasing to near 10 knots.
Seas around 2 feet. Numerous showers and scattered thunderstorms.
.FRIDAY NIGHT...Southwest winds near 10 knots. Seas 1 to 2 feet.
Numerous showers and scattered thunderstorms.
.SATURDAY...Southwest to west winds 5 to 10 knots. Seas around 1
foot. Numerous showers and scattered thunderstorms.
.SATURDAY NIGHT...Northwest winds near 5 knots, becoming variable.
Seas around 1 foot. Scattered showers and thunderstorms.
.SUNDAY...East winds near 5 knots. Seas 1 foot or less. Scattered
showers and thunderstorms.
.SUNDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas around
1 foot. Scattered showers and thunderstorms.

$$