477
FZUS52 KKEY 302021
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
421 PM EDT Wed Jul 30 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.

GMZ005-310830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
421 PM EDT Wed Jul 30 2025

.SYNOPSIS...The weakened western flank of an Atlantic ridge will
remain across South Florida and the Keys. This will result in
light broadly southeasterly breezes across Keys waters. The ridge
will strengthen modestly as it lifts towards Central Florida. As a
result, marine winds will nudge upwards slightly.

The Approximate Shoreward Edge of the Gulf Stream as of July 22...

59 NM South of Dry Tortugas Light...on Loggerhead Key.
 4 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
 2 NM South of Sand Key Light...off Key West.
 5 NM South of Looe Key...off Big Pine Key.
 6 NM Southeast of Sombrero Key Light...off Marathon.
 9 NM Southeast of Alligator Reef Light...off Islamorada.
 6 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.

$$

GMZ031-310830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
421 PM EDT Wed Jul 30 2025

.TONIGHT...Southeast winds 5 to 10 knots. Bay waters smooth to a
light chop. Isolated showers and thunderstorms.
.THURSDAY...East to southeast winds near 5 knots. Bay waters
smooth. Isolated showers and thunderstorms.
.THURSDAY NIGHT AND FRIDAY...East to southeast winds 5 to 10
knots. Bay waters smooth to a light chop. Isolated showers and
thunderstorms.
.FRIDAY NIGHT...East to southeast winds near 10 knots. Bay waters
a light chop. Isolated showers and thunderstorms.
.SATURDAY...Southeast winds near 5 knots. Bay waters smooth.
Isolated showers and thunderstorms.
.SATURDAY NIGHT...East to southeast winds near 5 knots. Bay
waters smooth. Isolated showers and thunderstorms.
.SUNDAY...Southeast winds near 5 knots. Bay waters smooth.
Isolated showers and thunderstorms.
.SUNDAY NIGHT...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. Isolated showers and thunderstorms.
.MONDAY AND MONDAY NIGHT...East to southeast winds near 10 knots.
Bay waters a light chop. Scattered showers and isolated
thunderstorms.

$$

GMZ032-035-310830-
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-
421 PM EDT Wed Jul 30 2025

.TONIGHT...Southeast winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop. Isolated showers and
thunderstorms.
.THURSDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.THURSDAY NIGHT AND FRIDAY...East to southeast winds 5 to 10
knots. Seas 1 foot or less. Nearshore waters smooth to a light
chop. Isolated showers and thunderstorms.
.FRIDAY NIGHT...East to southeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. Isolated showers and
thunderstorms.
.SATURDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.SATURDAY NIGHT...East to southeast winds 5 to 10 knots. Seas 1
foot or less. Nearshore waters smooth to a light chop. Isolated
showers and thunderstorms.
.SUNDAY...Southeast winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Isolated 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 isolated thunderstorms.
.MONDAY...Southeast winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East to southeast winds near 10 knots. Seas
building to 1 to 2 feet. Nearshore waters a light chop. Scattered
showers and isolated thunderstorms.

$$

GMZ042>044-310830-
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-
421 PM EDT Wed Jul 30 2025

.TONIGHT...Southeast winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Isolated showers and
thunderstorms.
.THURSDAY...East to southeast winds near 5 knots. Seas around
1 foot. Nearshore waters smooth. Isolated showers and
thunderstorms.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Isolated showers and
thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. Nearshore waters smooth to a light chop. Isolated showers
and thunderstorms.
.FRIDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Isolated showers and
thunderstorms.
.SATURDAY...East to southeast winds near 5 knots. Seas subsiding
to around 1 foot. Nearshore waters smooth. Isolated showers and
thunderstorms.
.SATURDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Isolated
showers and thunderstorms.
.SUNDAY...East to southeast winds near 5 knots. Seas around 1
foot. Nearshore waters smooth. Isolated showers and thunderstorms.
.SUNDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Isolated
showers and thunderstorms.
.MONDAY...East to southeast winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop. Isolated showers and
thunderstorms.
.MONDAY NIGHT...East to southeast winds near 10 knots. Seas
building to 2 to 3 feet. Nearshore waters a light chop. Scattered
showers and isolated thunderstorms.

$$

GMZ052>055-072>075-310830-
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-
421 PM EDT Wed Jul 30 2025

.TONIGHT...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. Wave Detail: East 2 feet at 4 seconds. Isolated showers
and thunderstorms.
.THURSDAY...East winds 5 to 10 knots. Seas 1 to 2 feet. Wave
Detail: East to southeast 2 feet at 4 seconds.
.THURSDAY NIGHT AND FRIDAY...East winds near 10 knots. Seas 1 to
2 feet. Isolated showers and thunderstorms.
.FRIDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
Isolated showers and thunderstorms.
.SATURDAY...East winds 5 to 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.SUNDAY AND SUNDAY NIGHT...East to southeast winds 5 to 10 knots.
Seas 1 to 2 feet. Isolated showers and thunderstorms.
.MONDAY...East to southeast winds near 10 knots. Seas 2 to
3 feet. Isolated showers and thunderstorms.
.MONDAY NIGHT...East to southeast winds near 10 knots. Seas 2 to
3 feet. Scattered showers and isolated thunderstorms.

$$

GMZ033-034-310830-
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-
421 PM EDT Wed Jul 30 2025

.TONIGHT...Southeast winds 5 to 10 knots. Seas around 1 foot.
Wave Detail: Southeast 1 foot at 3 seconds. Isolated showers and
thunderstorms.
.THURSDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Wave Detail: East to southeast 1 foot at 3 seconds.
Isolated showers and thunderstorms.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Isolated showers and thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots. Seas around 1
foot. Isolated showers and thunderstorms.
.FRIDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.SATURDAY...East to southeast winds near 5 knots. Seas subsiding
to 1 foot or less. Isolated showers and thunderstorms.
.SATURDAY NIGHT...East winds near 5 knots. Seas 1 foot or less.
Isolated showers and thunderstorms.
.SUNDAY...Southeast winds near 5 knots. Seas 1 foot or less.
Isolated showers and thunderstorms.
.SUNDAY NIGHT...East to southeast winds 5 to 10 knots. Seas around
1 foot. Isolated showers and thunderstorms.
.MONDAY...Southeast winds 5 to 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
building to 2 to 3 feet. Scattered showers and isolated
thunderstorms.


$$

AJP