200
FZUS52 KKEY 040831
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
431 AM EDT Fri Jul 4 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.

GMZ005-042045-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
431 AM EDT Fri Jul 4 2025

.SYNOPSIS...Troughing will gradually deepen into Florida today and
tomorrow with the Florida Keys local waters on the periphery of
this pattern. This will lead to sustained gentle to modestly
moderate southwesterly breezes, and an increase in showers and
thunderstorms. As the trough exits the region and lifts northeast
starting Sunday, a weak ridge axis will lie across the Florida
Keys, resulting in generally light to gentle easterly breezes.


The Approximate Shoreward Edge of the Gulf Stream as of June 29...

14 NM Southwest of Dry Tortugas Light...on Loggerhead Key.
15 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
18 NM South of Sand Key Light...off Key West.
26 NM South of Looe Key...off Big Pine Key.
31 NM South of Sombrero Key Light...off Marathon.
18 NM Southeast of Alligator Reef Light...off Islamorada.
 9 NM Southeast of Molasses Reef Light...off Key Largo.
 3 NM East 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.

$$

GMZ031-042045-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
431 AM EDT Fri Jul 4 2025

.TODAY...Southwest winds near 5 knots, increasing to 5 to 10 knots.
Bay waters smooth, becoming smooth to a light chop. Scattered
showers and thunderstorms.
.TONIGHT...Southwest winds 5 to 10 knots, increasing to near 10
knots. Bay waters smooth to a light chop, becoming a light chop.
Scattered showers and thunderstorms.
.SATURDAY...Southwest winds near 10 knots. Bay waters a light
chop. Scattered showers and thunderstorms.
.SATURDAY NIGHT...Southwest winds near 10 knots. Bay waters a
light chop. Scattered showers and isolated thunderstorms.
.SUNDAY...South to southwest 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.
.SUNDAY NIGHT...South to southwest winds near 5 knots, becoming
southeast to south. Bay waters smooth. Isolated showers and
thunderstorms.
.MONDAY...East to southeast winds near 5 knots. Bay waters
smooth. Isolated showers and thunderstorms.
.MONDAY NIGHT AND TUESDAY...East winds 5 to 10 knots. Bay waters
smooth to a light chop. Isolated showers and thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 5 to 10 knots. Bay
waters smooth to a light chop. Scattered showers and isolated
thunderstorms.

$$

GMZ032-035-042045-
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-
431 AM EDT Fri Jul 4 2025

.TODAY...Southwest winds 5 to 10 knots, increasing to near 10
knots. Seas around 1 foot. Nearshore waters smooth to a light
chop, becoming a light chop. Numerous showers and scattered
thunderstorms.
.TONIGHT...Southwest to west winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. Scattered showers and
thunderstorms.
.SATURDAY...Southwest winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. Scattered showers and
thunderstorms.
.SATURDAY NIGHT...Southwest winds near 10 knots, decreasing to 5
to 10 knots. Seas subsiding to 1 foot or less. Nearshore waters a
light chop, becoming smooth to a light chop. Scattered showers and
isolated thunderstorms.
.SUNDAY...South to southwest winds 5 to 10 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth to a light
chop. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...Variable winds near 5 knots, becoming southeast.
Seas 1 foot or less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.MONDAY...East to southeast winds near 5 knots, increasing to 5 to
10 knots. Seas 1 foot or less. Nearshore waters smooth, becoming
smooth to a light chop. Isolated showers and thunderstorms.
.MONDAY NIGHT...East winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop. Isolated showers and
thunderstorms.
.TUESDAY...Northeast to east winds 5 to 10 knots, increasing to
near 10 knots. Seas 1 foot or less, building to around 1 foot.
Nearshore waters smooth to a light chop, becoming a light chop.
Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 10 to 15 knots,
decreasing to near 10 knots. Seas around 1 foot. Nearshore waters
a light to moderate chop, becoming a light chop. Scattered
showers and isolated thunderstorms.

$$

GMZ042>044-042045-
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-
431 AM EDT Fri Jul 4 2025

.TODAY...Southwest to west winds 5 to 10 knots, increasing to near
10 knots. Seas around 1 foot. Nearshore waters smooth to a light
chop, becoming a light chop. Scattered showers and thunderstorms.
.TONIGHT...Southwest to west winds near 10 knots. Seas around
1 foot. Nearshore waters a light chop. Scattered showers and
thunderstorms.
.SATURDAY...Southwest winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. Scattered showers and
thunderstorms.
.SATURDAY NIGHT...Southwest winds near 10 knots, decreasing to 5
to 10 knots. Seas around 1 foot. Nearshore waters a light chop,
becoming smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY...South to southwest winds 5 to 10 knots, becoming
variable and decreasing to near 5 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop, becoming smooth.
Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...Variable winds near 5 knots, becoming southeast.
Seas 1 foot or less. Nearshore waters smooth. Isolated showers and
thunderstorms.
.MONDAY...East winds near 5 knots, increasing to 5 to 10 knots.
Seas building to around 1 foot. Nearshore waters smooth, becoming
smooth to a light chop. Isolated showers and thunderstorms.
.MONDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Isolated showers and
thunderstorms.
.TUESDAY...Northeast to east winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.TUESDAY NIGHT...East winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. Isolated showers and
thunderstorms.

$$

GMZ052>055-072>075-042045-
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-
431 AM EDT Fri Jul 4 2025

.TODAY...Southwest winds 5 to 10 knots, increasing to near 10
knots. Seas around 1 foot. Wave Detail: East to southeast 1 foot
at 4 seconds. Scattered showers and thunderstorms.
.TONIGHT...Southwest to west winds near 10 knots. Seas around 1
foot. Wave Detail: East 1 foot at 3 seconds. Scattered showers and
thunderstorms.
.SATURDAY...Southwest winds 5 to 10 knots. Seas around 1 foot.
Wave Detail: South to southwest 1 foot at 2 seconds. Scattered
showers and thunderstorms.
.SATURDAY NIGHT...South to southwest winds 5 to 10 knots. Seas
around 1 foot. Scattered showers and isolated thunderstorms.
.SUNDAY...South winds 5 to 10 knots. Seas around 1 foot. Isolated
showers and thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Isolated showers and thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas around 1 foot. Isolated
showers and thunderstorms.
.MONDAY NIGHT...East winds near 10 knots. Seas around 1 foot.
Isolated showers and thunderstorms.
.TUESDAY...Northeast to east winds near 10 knots. Seas 1 to
2 feet. Isolated showers and thunderstorms.
.TUESDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet.
Isolated showers and thunderstorms.

$$

GMZ033-034-042045-
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-
431 AM EDT Fri Jul 4 2025

.TODAY...Southwest to west winds near 10 knots. Seas 1 to 2 feet.
Wave Detail: West 2 feet at 5 seconds. Numerous showers and
scattered thunderstorms.
.TONIGHT...Southwest to west winds near 10 knots. Seas 1 to 2
feet. Wave Detail: West 2 feet at 4 seconds. Scattered showers and
thunderstorms.
.SATURDAY...Southwest to west winds near 10 knots. Seas 1 to
2 feet. Wave Detail: Southwest to west 1 foot at 3 seconds.
Numerous showers and scattered thunderstorms.
.SATURDAY NIGHT...Southwest winds near 10 knots, decreasing to 5
to 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot.
Scattered showers and isolated thunderstorms.
.SUNDAY...Southwest winds 5 to 10 knots, decreasing to near 5
knots. Seas around 1 foot. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...Southwest winds near 5 knots, becoming southeast
to south after midnight. Seas around 1 foot. Isolated showers and
thunderstorms.
.MONDAY...East to southeast winds 5 to 10 knots. Seas around
1 foot. Isolated showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
around 1 foot. Isolated showers and thunderstorms.
.TUESDAY...Northeast winds 5 to 10 knots. Seas around 1 foot.
Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Scattered showers and isolated thunderstorms.

$$