540
FZUS52 KKEY 221428
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1028 AM EDT Fri Aug 22 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.

GMZ005-230230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1028 AM EDT Fri Aug 22 2025

.SYNOPSIS...Hurricane Erin continues to race off into the North
Atlantic south of the Canadian Maritimes. A weak subtropical high
pressure ridge will continue to build into the Keys today before
settling over the Keys over the weekend continuing into early next
week. This will result in generally light breezes, occasionally
becoming light to gentle breezes as well as becoming variable at
times.

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.

$$

GMZ031-230230-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1028 AM EDT Fri Aug 22 2025

.THIS AFTERNOON...Southwest to west winds 5 to 10 knots. Bay
waters smooth to a light chop. Isolated showers and thunderstorms.
.TONIGHT...Southwest to west winds 5 to 10 knots, decreasing to
near 5 knots. Bay waters smooth to a light chop, becoming smooth.
Isolated showers and thunderstorms.
.SATURDAY...Southwest to west winds near 5 knots. Bay waters
smooth. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...West winds near 5 knots, becoming variable. Bay
waters smooth. Isolated showers and thunderstorms.
.SUNDAY...South to southwest winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...Southwest to west winds near 5 knots, becoming
variable. Bay waters smooth. Isolated showers and thunderstorms.
.MONDAY...South to southwest winds near 5 knots. Bay waters
smooth. Isolated showers and thunderstorms.
.MONDAY NIGHT...Southwest winds near 5 knots, becoming variable.
Bay waters smooth. Isolated showers and thunderstorms.
.TUESDAY...Variable winds near 5 knots. Bay waters smooth.
Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East winds near 5 knots. Bay waters smooth.
Isolated showers and thunderstorms.

$$

GMZ032-035-230230-
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-
1028 AM EDT Fri Aug 22 2025

.THIS AFTERNOON...South to southwest winds 5 to 10 knots,
becoming southwest to west. Seas 1 foot or less, except around 1
foot west of the Marquesas Keys. Nearshore waters smooth to a
light chop. Isolated showers and thunderstorms.
.TONIGHT...Southwest to west winds near 5 knots, becoming variable.
Seas 1 foot or less. Nearshore waters smooth. Isolated showers
and thunderstorms.
.SATURDAY...Southwest to west winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.SATURDAY NIGHT...West to northwest winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers and thunderstorms.
.SUNDAY...South winds 5 to 10 knots, becoming southwest to west
and decreasing to near 5 knots. Seas 1 foot or less, except
around 1 foot west of the Marquesas Keys. Nearshore waters smooth
to a light chop, becoming smooth. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...West to northwest winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers and thunderstorms.
.MONDAY...Southeast to south winds near 5 knots, becoming
southwest to west. Seas 1 foot or less. Nearshore waters smooth.
Isolated showers and thunderstorms.
.MONDAY NIGHT...West to northwest winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers and thunderstorms.
.TUESDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Isolated showers and thunderstorms.
.TUESDAY NIGHT...Variable winds near 5 knots, becoming northeast
to east. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers and thunderstorms.

$$

GMZ042>044-230230-
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-
1028 AM EDT Fri Aug 22 2025

.THIS AFTERNOON...Southwest to west winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Isolated
showers and thunderstorms.
.TONIGHT...Southwest to west winds 5 to 10 knots, becoming
variable and decreasing to near 5 knots. Seas around 1 foot,
subsiding to 1 foot or less. Nearshore waters smooth to a light
chop, becoming smooth. Isolated showers and thunderstorms.
.SATURDAY...South to southwest winds near 5 knots, becoming
southwest to west. Seas 1 foot or less. Nearshore waters smooth.
Isolated showers and thunderstorms.
.SATURDAY NIGHT...West to northwest winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers and thunderstorms.
.SUNDAY...Southeast to south winds 5 to 10 knots, becoming
southwest to west and decreasing to near 5 knots. Seas around 1
foot. Nearshore waters smooth to a light chop, becoming smooth.
Isolated showers and thunderstorms.
.SUNDAY NIGHT...West to northwest winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers and thunderstorms.
.MONDAY...Southeast to south winds near 5 knots, becoming
southwest to west. Seas around 1 foot. Nearshore waters smooth.
Isolated showers and thunderstorms.
.MONDAY NIGHT...Variable winds near 5 knots, becoming east. Seas
around 1 foot. Nearshore waters smooth. Isolated showers and
thunderstorms.
.TUESDAY...Northeast to east winds near 5 knots. Seas around
1 foot. Nearshore waters smooth. Isolated showers and
thunderstorms.
.TUESDAY NIGHT...Northeast to east winds near 5 knots. Seas
around 1 foot. Nearshore waters smooth. Isolated showers and
thunderstorms.

$$

GMZ052>055-072>075-230230-
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-
1028 AM EDT Fri Aug 22 2025

.THIS AFTERNOON...South to southwest winds 5 to 10 knots,
becoming variable and decreasing to near 5 knots. Seas 1 to 2
feet. Wave Detail: Southeast 1 foot at 4 seconds. Isolated
showers and thunderstorms.
.TONIGHT...Variable winds near 5 knots. Seas 1 to 2 feet. Wave
Detail: East 1 foot at 5 seconds. Isolated showers and
thunderstorms.
.SATURDAY...Variable winds near 5 knots. Seas 1 to 2 feet. Wave
Detail: East to southeast 1 foot at 3 seconds. Isolated showers
and thunderstorms.
.SATURDAY NIGHT...Variable winds near 5 knots, becoming southeast
and increasing to 5 to 10 knots. Seas 1 to 2 feet. Isolated
showers and thunderstorms.
.SUNDAY...Southeast to south winds 5 to 10 knots, becoming
variable and decreasing to near 5 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.SUNDAY NIGHT...Variable winds near 5 knots, becoming east to
southeast and increasing to 5 to 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.MONDAY...East to southeast winds near 5 knots, becoming east.
Seas 1 to 2 feet. Isolated showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
1 to 2 feet. Isolated showers and thunderstorms.
.TUESDAY...Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
1 to 2 feet. Scattered showers and isolated thunderstorms.

$$

GMZ033-034-230230-
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-
1028 AM EDT Fri Aug 22 2025

.THIS AFTERNOON...Southwest winds near 5 knots. Seas around 1
foot. Wave Detail: Southwest 1 foot at 3 seconds. Isolated showers
and thunderstorms.
.TONIGHT...Southwest winds near 5 knots. Seas around 1 foot. Wave
Detail: West 1 foot at 4 seconds. Isolated showers and
thunderstorms.
.SATURDAY...Southwest winds near 5 knots. Seas around 1 foot.
Wave Detail: West 1 foot at 4 seconds. Scattered showers and
isolated thunderstorms.
.SATURDAY NIGHT...West winds near 5 knots, becoming southeast to
south. Seas around 1 foot. Isolated showers and thunderstorms.
.SUNDAY...South to southwest winds 5 to 10 knots, becoming
southwest to west. Seas around 1 foot. Scattered showers and
isolated thunderstorms.
.SUNDAY NIGHT...West winds 5 to 10 knots, becoming variable. Seas
around 1 foot. Isolated showers and thunderstorms.
.MONDAY...Variable winds near 5 knots, becoming west. Seas around
1 foot. Isolated showers and thunderstorms.
.MONDAY NIGHT...West to northwest winds near 5 knots, becoming
variable. Seas around 1 foot. Isolated showers and thunderstorms.
.TUESDAY...Variable winds near 5 knots. Seas around 1 foot.
Isolated showers and thunderstorms.
.TUESDAY NIGHT...North to northeast winds near 5 knots. Seas
around 1 foot. Isolated showers and thunderstorms.

$$