130
FZUS52 KKEY 182049
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
449 PM EDT Sat Jul 18 2026

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.

The Wave Detail section highlights the period and direction of
origin for the highest-energy waves, as well as any long-period
swells moving in a different direction than the wind.

GMZ005-190900-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
449 PM EDT Sat Jul 18 2026

.SYNOPSIS...A broad area of low pressure over the eastern Gulf of
America will shift northward from tonight through Monday, with
prevailing gentle to moderate south to southeasterly breezes
across Florida Keys coastal waters. An Atlantic high pressure
ridge will extend to the Florida Peninsula for the next several
days. Gentle southeasterly breezes are expected to prevail across
Keys coastal waters Monday night through Thursday, with overnight
surges and afternoon lulls.

The Approximate Shoreward Edge of the Gulf Stream as of
July 17, 2026...

49 NM South of Dry Tortugas Light...on Loggerhead Key.
51 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
38 NM South of Sand Key Light...off Key West.
22 NM South of Looe Key...off Big Pine Key.
13 NM South of Sombrero Key Light...off Marathon.
 6 NM Southeast of Alligator Reef Light...off Islamorada.
 2 NM Southeast of Molasses Reef Light...off Key Largo.
 1 NM Southeast of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the National Weather Service in
Key West, using data from RTOFS and NASA SPoRT SST.

$$

GMZ031-190900-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
449 PM EDT Sat Jul 18 2026

.TONIGHT...Southeast winds 10 to 15 knots. Bay waters a light to
moderate chop. A slight chance of showers and thunderstorms.
.SUNDAY...Southeast to south winds near 15 knots, decreasing to
near 10 knots in the afternoon. Bay waters a moderate chop,
becoming a light chop. A slight chance of showers and
thunderstorms.
.SUNDAY NIGHT...Southeast to south winds 5 to 10 knots,
increasing to 10 to 15 knots after midnight. Bay waters smooth to
a light chop, becoming a light to moderate chop. A slight chance
of showers and thunderstorms.
.MONDAY...Southeast to south winds near 10 knots. Bay waters a
light chop. A slight chance of showers and thunderstorms.
.MONDAY NIGHT...Southeast winds 10 to 15 knots. Bay waters a
light to moderate chop.
.TUESDAY...Southeast winds 10 to 15 knots. Bay waters a light to
moderate chop.
.TUESDAY NIGHT...East to southeast winds 5 to 10 knots. Bay
waters smooth to a light chop.
.WEDNESDAY...Southeast winds 5 to 10 knots. Bay waters smooth to
a light chop.
.WEDNESDAY NIGHT...East to southeast winds 5 to 10 knots. Bay
waters smooth to a light chop.
.THURSDAY...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. A slight chance of showers.
.THURSDAY NIGHT...East to southeast winds 5 to 10 knots. Bay
waters smooth to a light chop. A slight chance of showers and
thunderstorms.

$$

GMZ032-035-190900-
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-
449 PM EDT Sat Jul 18 2026

.TONIGHT...Southeast winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. A slight chance of
showers and thunderstorms.
.SUNDAY...Southeast to south winds 10 to 15 knots, decreasing to
5 to 10 knots in the afternoon. Seas 1 to 2 feet. Nearshore waters
a light to moderate chop, becoming smooth to a light chop. A
chance of showers with a slight chance of thunderstorms.
.SUNDAY NIGHT...Southeast to south winds 5 to 10 knots, increasing
to 10 to 15 knots after midnight. Seas 1 foot or less. Nearshore
waters smooth to a light chop, becoming a light to moderate chop.
A slight chance of showers and thunderstorms.
.MONDAY...Southeast to south winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. A slight chance
of showers and thunderstorms.
.MONDAY NIGHT...Southeast winds 5 to 10 knots, increasing to
10 to 15 knots after midnight. Seas 1 foot or less. Nearshore
waters smooth to a light chop, becoming a light to moderate chop.
.TUESDAY...Southeast winds 10 to 15 knots. Seas 1 foot or less.
Nearshore waters a light to moderate chop.
.TUESDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
1 foot or less. Nearshore waters smooth to a light chop.
.WEDNESDAY...Southeast winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop.
.WEDNESDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
1 foot or less. Nearshore waters smooth to a light chop.
.THURSDAY...East to southeast winds 5 to 10 knots. Seas 1 foot or
less in the morning, then 1 foot or less. Nearshore waters smooth
to a light chop.
.THURSDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
1 foot or less. Nearshore waters smooth to a light chop. A slight
chance of showers and thunderstorms.

$$

GMZ042>044-190900-
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-
449 PM EDT Sat Jul 18 2026

.TONIGHT...Southeast winds 10 to 15 knots. Seas 2 to 3 feet.
Nearshore waters a light to moderate chop. A slight chance of
showers and thunderstorms.
.SUNDAY...Southeast to south winds 10 to 15 knots, decreasing to 5
to 10 knots in the afternoon. Seas 2 to 3 feet. Nearshore waters
a light to moderate chop, becoming smooth to a light chop. A
slight chance of showers and thunderstorms.
.SUNDAY NIGHT...Southeast to south winds 5 to 10 knots, increasing
to 10 to 15 knots after midnight. Seas 1 to 2 feet. Nearshore
waters smooth to a light chop, becoming a light to moderate chop.
A slight chance of showers and thunderstorms.
.MONDAY...Southeast to south winds 5 to 10 knots. Seas 1 to
2 feet. Nearshore waters smooth to a light chop. A slight chance
of showers and thunderstorms.
.MONDAY NIGHT...Southeast winds 5 to 10 knots, increasing to
10 to 15 knots after midnight. Seas 1 to 2 feet. Nearshore waters
smooth to a light chop, becoming a light to moderate chop.
.TUESDAY...Southeast winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop.
.TUESDAY NIGHT...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. Nearshore waters smooth to a light chop.
.WEDNESDAY...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. Nearshore waters smooth to a light chop.
.WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop.
.THURSDAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop.
.THURSDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. A slight
chance of showers and thunderstorms.

$$

GMZ052>055-072>075-190900-
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-
449 PM EDT Sat Jul 18 2026

.TONIGHT...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: East to southeast 3 feet at 4 seconds. A
slight chance of showers and thunderstorms.
.SUNDAY...Southeast to south winds 10 to 15 knots, decreasing 5
to 10 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: East
to southeast 3 feet at 5 seconds. A slight chance of showers and
thunderstorms.
.SUNDAY NIGHT...Southeast winds 5 to 10 knots, becoming southeast
to south and increasing to 10 to 15 knots after midnight. Seas 1
to 2 feet. Wave Detail: East to southeast 2 feet at 5 seconds. A
slight chance of showers and thunderstorms.
.MONDAY...Southeast to south winds 5 to 10 knots. Seas 1 to
2 feet. A slight chance of showers and thunderstorms.
.MONDAY NIGHT...East winds 5 to 10 knots, becoming east to
southeast 10 to 15 knots after midnight. Seas 2 to 3 feet.
.TUESDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. A
slight chance of showers.
.WEDNESDAY...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet.
.WEDNESDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet. A
slight chance of showers and thunderstorms.
.THURSDAY...East winds 5 to 10 knots. Seas 1 to 2 feet.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet. A
slight chance of showers and thunderstorms.

$$

GMZ033-034-190900-
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-
449 PM EDT Sat Jul 18 2026

.TONIGHT...Southeast winds 5 to 10 knots, becoming southeast to
south and increasing to 10 to 15 knots after midnight. Seas 1 to
2 feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest
1 foot at 5 seconds. A chance of showers and thunderstorms.
.SUNDAY...Southeast to south winds 10 to 15 knots, becoming south
and decreasing to 5 to 10 knots in the afternoon. Seas 1 to 2
feet. Wave Detail: Southeast 2 feet at 4 seconds and northwest 1
foot at 5 seconds. A chance of showers and thunderstorms.
.SUNDAY NIGHT...South winds 5 to 10 knots. Seas around 1 foot.
Wave Detail: Southeast to south 1 foot at 3 seconds and northwest
1 foot at 4 seconds. A chance of showers with a slight chance of
thunderstorms.
.MONDAY...South winds 5 to 10 knots. Seas 1 to 2 feet. A chance
of showers with a slight chance of thunderstorms.
.MONDAY NIGHT...South winds 5 to 10 knots, becoming southeast
after midnight. Seas around 1 foot.
.TUESDAY...Southeast winds 10 to 15 knots, becoming 5 to 10 knots
in the afternoon. Seas 1 to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 10 knots. Seas around
1 foot.
.WEDNESDAY...Southeast winds 5 to 10 knots. Seas around 1 foot.
.WEDNESDAY NIGHT...East to southeast winds near 5 knots. Seas
around 1 foot.
.THURSDAY...East to southeast winds near 5 knots. Seas 1 foot or
less.
.THURSDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. A slight chance of showers and thunderstorms.

$$