036
FZUS52 KKEY 210227
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1027 PM EDT Wed Aug 20 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.

GMZ005-211430-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1027 PM EDT Wed Aug 20 2025

.SYNOPSIS...Hurricane Erin will continue to follow a mainly northerly
track along the Eastern Seaboard. The increasingly expansive
circulation of Erin will result in a transition from light to
gentle variable breezes early this morning to gentle to moderate
northwest breezes into tonight. A slight swell from the north
will lead to elevated seas in eastern portions of the Florida
Straits. As Hurricane Erin migrates farther away toward the north
and northeast, a weak subtropical high pressure ridge will settle
over Florida Keys coastal waters, resulting in a lighter wind
pattern Thursday through Saturday.

The Approximate Shoreward Edge of the Gulf Stream as of August
14...

45 NM South of Dry Tortugas Light...on Loggerhead Key.
34 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
41 NM South of Sand Key Light...off Key West.
24 NM South of Looe Key...off Big Pine Key.
18 NM Southeast of Sombrero Key Light...off Marathon.
 9 NM Southeast of Alligator Reef Light...off Islamorada.
 5 NM Southeast of Molasses Reef Light...off Key Largo.
 3 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.

$$

GMZ031-211430-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1027 PM EDT Wed Aug 20 2025

.OVERNIGHT...West to northwest winds near 10 knots, becoming
southwest to west late. Bay waters a light chop. Scattered
showers and isolated thunderstorms.
.THURSDAY...Southwest to west winds near 10 knots. Bay waters a
light chop. Scattered showers and isolated thunderstorms.
.THURSDAY NIGHT...Southwest to west winds near 10 knots,
decreasing to 5 to 10 knots. Bay waters a light chop, becoming smooth
to a light chop. Scattered showers and isolated thunderstorms.
.FRIDAY...Southwest to west winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...West winds 5 to 10 knots. Bay waters smooth to a
light chop. Isolated showers and thunderstorms.
.SATURDAY...Southwest to west winds 5 to 10 knots, decreasing to
near 5 knots. Bay waters smooth to a light chop, becoming smooth.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...Southwest to west winds near 5 knots. Bay
waters smooth. Isolated showers and thunderstorms.
.SUNDAY...Southwest winds near 5 knots, increasing to 5 to 10
knots. Bay waters smooth, becoming smooth to a light chop.
Isolated showers and thunderstorms.
.SUNDAY NIGHT...Southwest to west winds 5 to 10 knots, becoming
southwest. Bay waters smooth to a light chop. Isolated showers
and thunderstorms.
.MONDAY...South to southwest winds near 5 knots, becoming
southwest in the afternoon. Bay waters smooth, becoming smooth to
a light chop. Isolated showers and thunderstorms.
.MONDAY NIGHT...West winds near 5 knots. Bay waters smooth.
Isolated showers and thunderstorms.

$$

GMZ032-035-211430-
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-
1027 PM EDT Wed Aug 20 2025

.OVERNIGHT...West to northwest winds 5 to 10 knots, becoming
southwest to west near 10 knots. Seas 1 to 2 feet. Nearshore
waters smooth to a light chop, becoming a light chop. Scattered
showers and isolated thunderstorms.
.THURSDAY...Southwest to west winds near 10 knots. Seas around
1 foot. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.THURSDAY NIGHT...Southwest to west winds decreasing to 5 to 10
knots. Seas around 1 foot. Nearshore waters becoming smooth to a
light chop. Scattered showers and isolated thunderstorms.
.FRIDAY...Southwest to west winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.FRIDAY NIGHT...Southwest to west winds 5 to 10 knots. Seas
1 foot or less. Nearshore waters smooth to a light chop. Isolated
showers and thunderstorms.
.SATURDAY...Southwest to west winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.SATURDAY NIGHT...West to northwest winds 5 to 10 knots, becoming
south to southwest. Seas 1 foot or less. Nearshore waters smooth
to a light chop. Isolated showers and thunderstorms.
.SUNDAY...Southwest to west winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Isolated showers
and thunderstorms.
.SUNDAY NIGHT...West to northwest winds 5 to 10 knots. Seas 1
foot or less. Nearshore waters smooth to a light chop, becoming
smooth. Isolated showers and thunderstorms.
.MONDAY...South winds near 5 knots, becoming southwest to west.
Seas 1 foot or less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.MONDAY NIGHT...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Isolated showers and thunderstorms.

$$

GMZ042-211430-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
1027 PM EDT Wed Aug 20 2025

.OVERNIGHT...West to northwest winds near 10 knots, becoming
southwest to west late. Seas 1 to 2 feet. Nearshore waters a
light chop. Scattered showers and isolated thunderstorms.
.THURSDAY...Southwest to west winds 10 to 15 knots, decreasing to
near 10 knots. Seas 1 to 2 feet. Nearshore waters a light to
moderate chop, becoming a light chop. Scattered showers and
isolated thunderstorms.
.THURSDAY NIGHT...Southwest to west winds near 10 knots,
decreasing to 5 to 10 knots. Seas 1 to 2 feet, subsiding to around
1 foot. Nearshore waters a light chop, becoming smooth to a light
chop. Scattered showers and isolated thunderstorms.
.FRIDAY...Southwest to west winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.FRIDAY NIGHT...West winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Isolated showers and
thunderstorms.
.SATURDAY...Southwest to west winds near 5 knots. Seas around 1
foot. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.SATURDAY NIGHT...Southwest to west winds near 5 knots. Seas
around 1 foot. Nearshore waters smooth. Isolated showers and
thunderstorms.
.SUNDAY AND SUNDAY NIGHT...Southwest winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Isolated
showers and thunderstorms.
.MONDAY...South to southwest winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Isolated showers
and thunderstorms.
.MONDAY NIGHT...Southwest winds 5 to 10 knots, becoming southwest
to west. Seas around 1 foot. Nearshore waters smooth to a light
chop, becoming smooth. Isolated showers and thunderstorms.

$$

GMZ043-044-211430-
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-
1027 PM EDT Wed Aug 20 2025

.OVERNIGHT...West to northwest winds 5 to 10 knots, becoming
southwest to west near 10 knots. Seas around 1 foot. Nearshore
waters smooth to a light chop, becoming a light chop. Scattered
showers and isolated thunderstorms.
.THURSDAY...Southwest to west winds near 10 knots, decreasing to 5
to 10 knots. Seas around 1 foot, subsiding to 1 foot or less.
Nearshore waters a light chop, becoming smooth to a light chop.
Scattered showers and isolated thunderstorms.
.THURSDAY NIGHT...Southwest to west winds near 5 knots. Seas
around 1 foot. Nearshore waters smooth. Scattered showers and
isolated thunderstorms.
.FRIDAY...Southwest to west winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...Southwest to west winds near 5 knots. Seas 1 foot
or less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.SATURDAY...Southwest to west winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Scattered
showers and isolated thunderstorms.
.SATURDAY NIGHT...Variable winds near 5 knots, becoming southeast
to south. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers and thunderstorms.
.SUNDAY...South winds near 5 knots, becoming southwest to west
Seas 1 foot or less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.SUNDAY NIGHT...West to northwest winds near 5 knots. Seas 1 foot
or less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.MONDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.MONDAY NIGHT...North to northeast winds near 5 knots, becoming
east around 5 knots after midnight. Seas 1 foot or less.
Nearshore waters smooth. Isolated showers and thunderstorms.

$$

GMZ052-072-211430-
Straits of Florida from Ocean Reef to Craig Key out 20 NM-
Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out-
1027 PM EDT Wed Aug 20 2025

.OVERNIGHT...West to northwest winds 10 to 15 knots, becoming
southwest to west near 10 knots. Seas 2 to 3 feet. Wave Detail:
West 2 feet at 4 seconds and north to northeast 1 foot at 5
seconds. Scattered showers and isolated thunderstorms.
.THURSDAY...Southwest to west winds near 10 knots. Seas 2 to 3
feet. Wave Detail: Southwest to west 2 feet at 3 seconds and north
to northeast 2 feet at 12 seconds. Scattered showers and isolated
thunderstorms.
.THURSDAY NIGHT...Southwest to west winds near 10 knots,
decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2
feet. Wave Detail: North to northeast 2 feet at 11 seconds and
southwest to west 1 foot at 3 seconds. Isolated showers and
thunderstorms.
.FRIDAY...Southwest to west winds 5 to 10 knots. Seas 1 to
2 feet. Isolated showers and thunderstorms.
.FRIDAY NIGHT...Southwest to west winds 5 to 10 knots. Seas 1 to
2 feet. Isolated showers and thunderstorms.
.SATURDAY...Southwest to west winds near 5 knots. Seas 1 to 2
feet. Isolated showers and thunderstorms.
.SATURDAY NIGHT...Southwest to west winds near 5 knots. Seas 1 to
2 feet. Isolated showers and thunderstorms.
.SUNDAY...South to southwest winds near 5 knots. Seas 1 to
2 feet. Isolated showers and thunderstorms.
.SUNDAY NIGHT...South winds near 5 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.MONDAY...South winds near 5 knots. Seas 1 to 2 feet. Isolated
showers and thunderstorms.
.MONDAY NIGHT...Southeast to south winds near 5 knots. Seas
1 foot or less. Isolated showers and thunderstorms.

$$

GMZ053>055-073>075-211430-
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 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-
1027 PM EDT Wed Aug 20 2025

.OVERNIGHT...West to northwest winds 5 to 10 knots, becoming
southwest near 10 knots. Seas 1 to 2 feet. Wave Detail: Northwest
1 foot at 3 seconds and east 1 foot at 5 seconds. Scattered
showers and isolated thunderstorms.
.THURSDAY...Southwest to west winds near 10 knots, decreasing to 5
to 10 knots. Seas 1 to 2 feet. Wave Detail: Southwest to west 1
foot at 3 seconds and east 1 foot at 5 seconds. Scattered showers
and isolated thunderstorms.
.THURSDAY NIGHT...West winds decreasing to near 5 knots, becoming
south to southwest. Seas subsiding to around 1 foot. Wave Detail:
West 1 foot at 3 seconds and east 1 foot at 4 seconds. Isolated
showers and thunderstorms.
.FRIDAY...Southwest to west winds near 5 knots, becoming west to
northwest. Seas around 1 foot. Isolated showers and thunderstorms.
.FRIDAY NIGHT...West to northwest winds near 5 knots, becoming
variable. Seas around 1 foot. Isolated showers and thunderstorms.
.SATURDAY...Variable winds near 5 knots. Seas around 1 foot.
Isolated showers and thunderstorms.
.SATURDAY NIGHT...Variable winds near 5 knots, becoming east to
southeast. Seas around 1 foot. Isolated showers and thunderstorms.
.SUNDAY...East to southeast winds near 5 knots. Seas around
1 foot. Isolated showers and thunderstorms.
.SUNDAY NIGHT...Variable winds 5 to 10 knots. Seas around 1 foot.
Isolated showers and thunderstorms.
.MONDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Isolated showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
1 foot or less. Isolated showers and thunderstorms.

$$

GMZ033-034-211430-
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-
1027 PM EDT Wed Aug 20 2025

.OVERNIGHT...West to northwest winds 5 to 10 knots, becoming
southwest to west near 10 knots. Seas 1 to 2 feet. Wave Detail:
Northwest 1 foot at 3 seconds. Scattered showers and isolated
thunderstorms.
.THURSDAY...Southwest to west winds near 10 knots, decreasing to
5 to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. Wave
Detail: West 1 foot at 3 seconds. Scattered showers and isolated
thunderstorms.
.THURSDAY NIGHT...Southwest to west winds 5 to 10 knots. Seas
around 1 foot. Wave Detail: West 1 foot at 3 seconds. Isolated
showers and thunderstorms.
.FRIDAY...Southwest to west winds 5 to 10 knots. Seas around
1 foot. Scattered showers and isolated thunderstorms.
.FRIDAY NIGHT...Southwest to west winds 5 to 10 knots. Seas
around 1 foot. Isolated showers and thunderstorms.
.SATURDAY...Southwest to west winds near 5 knots, becoming west to
northwest. Seas around 1 foot. Scattered showers and isolated
thunderstorms.
.SATURDAY NIGHT...West to northwest winds near 5 knots, becoming
southwest to west. Seas around 1 foot. Isolated showers and
thunderstorms.
.SUNDAY...Southwest to west winds near 5 knots. Seas around 1
foot. Isolated showers and thunderstorms.
.SUNDAY NIGHT...West to northwest winds near 5 knots. Seas around
1 foot. Isolated showers and thunderstorms.
.MONDAY...South winds near 5 knots, becoming southwest to west in
the afternoon. Seas 1 foot or less. Isolated showers and
thunderstorms.
.MONDAY NIGHT...North winds near 5 knots. Seas 1 foot or less.
Isolated showers and thunderstorms.

$$