976
FZUS52 KKEY 042014
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
414 PM EDT Thu Sep 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.

GMZ005-050815-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
414 PM EDT Thu Sep 4 2025

.SYNOPSIS...A broad surface low along a stationary front
stretching from the Gulf eastward to the Florida Peninsula will
maintain southwesterly winds across the Florida Keys marine
zones. The front will remain rooted in place through the next few
days, while the low meanders northeast into the western North
Atlantic, promoting southwest to west breezes. Abundant moisture
will promote well above normal rain and thunder chances through
the end of the work week. High pressure slowly building across the
North Atlantic over the weekend will support reduced rain and
thunder chances, although remaining at or above normal.

The Approximate Shoreward Edge of the Gulf Stream as of September 1...

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

$$

GMZ031-050815-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
414 PM EDT Thu Sep 4 2025

.TONIGHT...Southwest winds 10 to 15 knots. Bay waters a light to
moderate chop. Numerous showers and scattered thunderstorms.
.FRIDAY...Southwest winds near 10 knots, increasing to 10 to 15
knots. Bay waters a light chop, becoming a light to moderate
chop. Widespread showers and scattered thunderstorms.
.FRIDAY NIGHT...South to southwest winds near 10 knots. Bay
waters a light chop. Scattered showers and thunderstorms.
.SATURDAY...South to southwest winds decreasing to 5 to 10 knots.
Bay waters becoming smooth to a light chop. Scattered showers and
thunderstorms.
.SATURDAY NIGHT...South to southwest winds near 5 knots. Bay
waters smooth. Scattered showers and thunderstorms.
.SUNDAY...South to southwest winds near 5 knots. Bay waters
smooth. Numerous showers and scattered thunderstorms.
.SUNDAY NIGHT...Southeast to south winds near 5 knots. Bay waters
smooth. Scattered showers and thunderstorms.
.MONDAY...Southeast to south winds near 5 knots. Bay waters
smooth. Scattered showers and thunderstorms.
.MONDAY NIGHT THROUGH TUESDAY NIGHT...East to southeast winds
near 5 knots. Bay waters smooth. Scattered showers and
thunderstorms.

$$

GMZ032-035-050815-
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-
414 PM EDT Thu Sep 4 2025

.TONIGHT...Southwest winds 10 to 15 knots. Seas subsiding to 1 to
2 feet. Nearshore waters a light to moderate chop. Numerous
showers and scattered thunderstorms.
.FRIDAY...Southwest winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Widespread showers and
scattered thunderstorms.
.FRIDAY NIGHT...South to southwest winds 10 to 15 knots,
decreasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters a
light to moderate chop, becoming a light chop. Scattered showers
and thunderstorms.
.SATURDAY...Southwest winds decreasing to 5 to 10 knots. Seas
subsiding to around 1 foot. Nearshore waters becoming smooth to a
light chop. Numerous showers and scattered thunderstorms.
.SATURDAY NIGHT...Southwest winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and
thunderstorms.
.SUNDAY...Southwest winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and thunderstorms.
.SUNDAY NIGHT...Southwest to west winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Scattered
showers and thunderstorms.
.MONDAY...Variable winds near 5 knots, becoming east to southeast.
Seas 1 foot or less. Nearshore waters smooth. Scattered showers
and thunderstorms.
.MONDAY NIGHT THROUGH TUESDAY NIGHT...East to southeast winds
near 5 knots. Seas 1 foot or less. Nearshore waters smooth.
Scattered showers and thunderstorms.

$$

GMZ042>044-050815-
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-
414 PM EDT Thu Sep 4 2025

.TONIGHT...Southwest winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Numerous showers and
scattered thunderstorms.
.FRIDAY...Southwest winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Widespread showers and
scattered thunderstorms.
.FRIDAY NIGHT...South to southwest winds 10 to 15 knots. Seas
1 to 2 feet. Nearshore waters a light to moderate chop. Scattered
showers and thunderstorms.
.SATURDAY...Southwest winds near 10 knots, decreasing to 5 to 10
knots. Seas subsiding to around 1 foot. Nearshore waters a light
chop, becoming smooth to a light chop. Scattered showers and
thunderstorms.
.SATURDAY NIGHT...South to southwest winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. Scattered showers and
thunderstorms.
.SUNDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and thunderstorms.
.SUNDAY NIGHT...Variable winds near 5 knots, becoming east to
southeast. Seas 1 foot or less. Nearshore waters smooth.
Scattered showers and thunderstorms.
.MONDAY THROUGH TUESDAY NIGHT...East to southeast winds near 5
knots. Seas 1 foot or less. Nearshore waters smooth. Scattered
showers and thunderstorms or less.

$$

GMZ052>055-072>075-050815-
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-
414 PM EDT Thu Sep 4 2025

.TONIGHT...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest to west 2 feet at 5 seconds. Numerous
showers and scattered thunderstorms.
.FRIDAY...Southwest winds 10 to 15 knots, decreasing to near 10
knots. Seas subsiding to 1 to 2 feet. Wave Detail: Southwest to
west 2 feet at 5 seconds. Numerous showers and scattered
thunderstorms.
.FRIDAY NIGHT...South to southwest winds near 10 knots. Seas 1 to
2 feet. Wave Detail: Southwest to west 2 feet at 5 seconds.
Scattered showers and thunderstorms.
.SATURDAY...South to southwest winds 5 to 10 knots. Seas 1 to 2
feet. Scattered showers and thunderstorms.
.SATURDAY NIGHT...Variable winds near 5 knots. Seas around 1
foot. Scattered showers and thunderstorms.
.SUNDAY...Variable winds near 5 knots, becoming northwest to
north. Seas around 1 foot. Scattered showers and thunderstorms.
.SUNDAY NIGHT...East winds near 5 knots. Seas around 1 foot.
Scattered showers and thunderstorms.
.MONDAY...East to southeast winds near 5 knots. Seas around 1
foot. Scattered showers and thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Scattered showers and thunderstorms.
.TUESDAY...East to southeast winds near 5 knots. Seas around 1
foot. Scattered showers and thunderstorms.
.TUESDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Scattered showers and thunderstorms.

$$

GMZ033-034-050815-
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-
414 PM EDT Thu Sep 4 2025

.TONIGHT...Southwest to west winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: Southwest to west 3 feet at 5 seconds.
Numerous showers and scattered thunderstorms.
.FRIDAY...Southwest to west winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: Southwest to west 2 feet at 5 seconds.
Widespread showers and scattered thunderstorms.
.FRIDAY NIGHT...Southwest winds near 10 knots. Seas around 2 feet,
subsiding to 1 to 2 feet. Wave Detail: Southwest 2 feet at 5
seconds. Scattered showers and thunderstorms.
.SATURDAY...Southwest winds 5 to 10 knots. Seas 1 to 2 feet.
Scattered showers and thunderstorms.
.SATURDAY NIGHT...Southwest to west winds near 5 knots. Seas
around 1 foot. Scattered showers and thunderstorms.
.SUNDAY...West to northwest winds near 5 knots. Seas around
1 foot. Scattered showers and thunderstorms.
.SUNDAY NIGHT...Northwest winds near 5 knots, becoming variable.
Seas 1 foot or less. Scattered showers and thunderstorms.
.MONDAY...Variable winds near 5 knots, becoming east. Seas 1 foot
or less. Scattered showers and thunderstorms.
.MONDAY NIGHT...Northeast to east winds near 5 knots. Seas 1 foot
or less. Scattered showers and thunderstorms.
.TUESDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Scattered showers and thunderstorms.
.TUESDAY NIGHT...East winds near 5 knots. Seas 1 foot or less.
Scattered showers and thunderstorms.

$$

AP/JAM