783
FZUS52 KKEY 302018
CWFKEY

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

GMZ005-310830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
418 PM EDT Thu Jul 30 2026

.SYNOPSIS...The western periphery of an Atlantic surface ridge
will continue to slide westward across the Florida Keys coastal
waters. This will result in a weak nebulous flow through tonight,
resulting in light to gentle breezes. A col region will set up for
Friday into the first part of the weekend, resulting in a
potential period of light and variable breezes. As high pressure
strengthens in the North Atlantic, southeast breezes will freshen
by the second half of the weekend and into early next week.

The Approximate Shoreward Edge of the Gulf Stream as of
July 26, 2026...

40 NM South of Dry Tortugas Light...on Loggerhead Key.
49 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
44 NM South of Sand Key Light...off Key West.
28 NM South of Looe Key...off Big Pine Key.
 4 NM South of Sombrero Key Light...off Marathon.
 3 NM Southeast of Alligator Reef Light...off Islamorada.
 1 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.

$$

GMZ031-310830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
418 PM EDT Thu Jul 30 2026

.TONIGHT...Southwest to west winds 5 to 10 knots, decreasing to
near 5 knots. Bay waters smooth to a light chop, becoming smooth.
.FRIDAY...Southwest winds near 5 knots. Bay waters smooth. A
slight chance of showers and thunderstorms.
.FRIDAY NIGHT...Southwest to west winds near 5 knots. Bay waters
smooth.
.SATURDAY...Variable winds near 5 knots, becoming south to
southwest. Bay waters smooth. A slight chance of showers and
thunderstorms.
.SATURDAY NIGHT...South to southwest winds near 5 knots, becoming
southeast and increasing to 5 to 10 knots. Bay waters smooth,
becoming smooth to a light chop. A slight chance of showers and
thunderstorms.
.SUNDAY...Southeast to south winds 5 to 10 knots. Bay waters
smooth to a light chop. A slight chance of showers and
thunderstorms.
.SUNDAY NIGHT...Southeast winds 5 to 10 knots. Bay waters smooth
to a light chop.
.MONDAY...Southeast winds near 10 knots, becoming south and
decreasing to near 5 knots. Bay waters a light chop, becoming
smooth. A chance of showers and thunderstorms.
.MONDAY NIGHT...Southeast winds 5 to 10 knots. Bay waters smooth
to a light chop. A slight chance of showers.
.TUESDAY...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. A chance of showers and thunderstorms.
.TUESDAY NIGHT...East winds near 10 knots. Bay waters a light
chop. A slight chance of showers and 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-
418 PM EDT Thu Jul 30 2026

.TONIGHT...Southwest to west winds 5 to 10 knots, becoming
southwest and decreasing to near 5 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop, becoming smooth.
.FRIDAY...Southwest to west winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A slight chance of showers and
thunderstorms.
.FRIDAY NIGHT...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth.
.SATURDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A slight chance of showers and
thunderstorms.
.SATURDAY NIGHT...Variable winds near 5 knots, becoming southeast
and increasing to 5 to 10 knots. Seas 1 foot or less. Nearshore
waters smooth, becoming smooth to a light chop. A slight chance of
showers and thunderstorms.
.SUNDAY...Southeast to south winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. A slight chance of
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. A slight
chance of showers and thunderstorms.
.MONDAY...Southeast to south winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. A slight chance of
showers and thunderstorms.
.MONDAY 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.
.TUESDAY...East to southeast winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.
.TUESDAY NIGHT...East winds near 10 knots. Seas 1 foot or less.
Nearshore waters a light chop. A chance of showers and
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-
418 PM EDT Thu Jul 30 2026

.TONIGHT...Southwest to west winds 5 to 10 knots, becoming south
to southwest and decreasing to near 5 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop, becoming smooth.
.FRIDAY...South to southwest winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. A slight chance of showers and
thunderstorms.
.FRIDAY NIGHT...Southwest winds near 5 knots, becoming variable.
Seas 1 foot or less. Nearshore waters smooth.
.SATURDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. A slight chance of showers and
thunderstorms.
.SATURDAY NIGHT...Variable winds near 5 knots, becoming southeast
and increasing to near 10 knots. Seas 1 foot or less, building to
around 1 foot. Nearshore waters smooth, becoming a light chop. A
slight chance of showers and thunderstorms.
.SUNDAY...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.
.SUNDAY 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.
.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...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.
.TUESDAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. A chance of
showers and thunderstorms.
.TUESDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. A chance of showers and
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-
418 PM EDT Thu Jul 30 2026

.TONIGHT...Variable winds near 5 knots. Seas around 1 foot. Wave
Detail: West to northwest 1 foot at 5 seconds.
.FRIDAY...East to southeast winds near 5 knots, becoming east.
Seas around 1 foot. Wave Detail: East to southeast 1 foot at 3
seconds and west to northwest 1 foot at 4 seconds. A slight chance
of showers and thunderstorms.
.FRIDAY NIGHT...East to southeast winds near 5 knots. Seas around
1 foot. Wave Detail: East to southeast 1 foot at 3 seconds and
northwest 1 foot at 4 seconds.
.SATURDAY...East winds near 5 knots. Seas around 1 foot. A slight
chance of showers and thunderstorms.
.SATURDAY NIGHT...East to southeast winds 5 to 10 knots,
increasing to near 10 knots. Seas 1 to 2 feet. A chance of
showers with a slight chance of thunderstorms.
.SUNDAY...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. A slight chance of showers and thunderstorms.
.SUNDAY NIGHT...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. A slight chance of showers.
.MONDAY...Southeast winds 5 to 10 knots. Seas 1 to 2 feet. A
slight chance of showers and thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. A slight chance of showers and thunderstorms.
.TUESDAY...East to southeast winds 5 to 10 knots. Seas 1 to 2
feet. Nearshore waters smooth to a light chop. A chance of showers
and thunderstorms.
.TUESDAY NIGHT...East winds near 10 knots. Seas 2 to 3 feet.
Nearshore waters a light chop. A chance of showers and
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-
418 PM EDT Thu Jul 30 2026

.TONIGHT...Southwest to west winds near 5 knots. Seas around
1 foot. Wave Detail: West to northwest 1 foot at 5 seconds.
.FRIDAY...West winds near 5 knots. Seas around 1 foot. Wave
Detail: Northwest 1 foot at 5 seconds.
.FRIDAY NIGHT...West to northwest winds near 5 knots. Seas around
1 foot. Wave Detail: Northwest 1 foot at 5 seconds.
.SATURDAY...Variable winds near 5 knots. Seas around 1 foot. A
slight chance of showers and thunderstorms.
.SATURDAY NIGHT...Variable winds near 5 knots, becoming southeast
and increasing to 5 to 10 knots. Seas around 1 foot. A slight
chance of showers and thunderstorms.
.SUNDAY...Southeast to south winds 5 to 10 knots, decreasing to
near 5 knots. Seas around 1 foot. A slight chance of showers and
thunderstorms.
.SUNDAY NIGHT...East to southeast winds near 5 knots, becoming
southeast. Seas around 1 foot. A slight chance of showers and
thunderstorms.
.MONDAY...Southeast to south winds 5 to 10 knots. Seas around
1 foot. A slight chance of showers and thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. A slight chance of showers and thunderstorms.
.TUESDAY...East to southeast winds 5 to 10 knots. Seas around 1
foot. A chance of showers and thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots, increasing to near 10
knots. Seas around 1 foot, building to 1 to 2 feet. A chance of
showers and thunderstorms.

$$