419 
FZUS52 KKEY 242028
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
428 PM EDT Fri Oct 24 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.

GMZ005-250830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
428 PM EDT Fri Oct 24 2025

.SYNOPSIS...Tropical Storm Melissa churning in the central 
Caribbean Sea in combination with high pressure building across 
the Southeast U.S. over the next couple days will lead to a 
continued tightening of the pressure gradient. This will promote 
fresh to strong northeast to easterly breezes through the 
weekend. Breezes will modestly, but briefly, slacken for early 
next week, although breezes will likely freshen as the next
frontal passage occurs towards midweek.

The Approximate Shoreward Edge of the Gulf Stream as of 
October 21...

47 NM South of Dry Tortugas Light...on Loggerhead Key. 
42 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 
32 NM South of Sand Key Light...off Key West.  
22 NM South of Looe Key...off Big Pine Key.
16 NM Southeast 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.
 2 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.

$$

GMZ031-250830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
428 PM EDT Fri Oct 24 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast to east winds 20 to 25 knots, increasing to
near 25 knots. Bay waters very rough, becoming extremely rough. 
Scattered showers.
.SATURDAY...Northeast to east winds near 25 knots. Bay waters 
extremely rough. Isolated showers. 
.SATURDAY NIGHT...Northeast to east winds near 25 knots. Bay 
waters extremely rough. Scattered showers. 
.SUNDAY...Northeast to east winds 20 to 25 knots. Bay waters very
rough. Scattered showers. 
.SUNDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots. Bay waters rough, becoming choppy. Scattered 
showers.
.MONDAY...Northeast to east winds near 15 knots. Bay waters a
moderate chop. Scattered showers. 
.MONDAY NIGHT...Northeast winds 15 to 20 knots. Bay waters
choppy. Scattered showers. 
.TUESDAY...North winds near 15 knots, briefly decreasing to 10 to
15 knots in the afternoon. Bay waters a moderate chop, becoming a 
light to moderate chop. Isolated showers.
.TUESDAY NIGHT...Northwest to north winds increasing to 15 to 20 
knots. Bay waters becoming choppy. 
.WEDNESDAY...Northwest to north winds 15 to 20 knots. Bay waters
choppy. 
.WEDNESDAY NIGHT...Northwest to north winds near 20 knots. Bay
waters rough. 

$$

GMZ032-035-250830-
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-
428 PM EDT Fri Oct 24 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast to east winds 20 to 25 knots, increasing to
near 25 knots. Seas building to 3 to 5 feet, occasionally to 6 
feet. West of the Marquesas Keys, seas building to 5 to 6 feet, 
occasionally to 8 feet. Nearshore waters very rough, becoming 
extremely rough. Scattered showers.
.SATURDAY...Northeast to east winds near 25 knots. Seas 3 to 5 
feet, occasionally to 6 feet, except 5 to 7 feet, occasionally to 
9 feet west of the Marquesas Keys. Nearshore waters extremely 
rough. Isolated showers. 
.SATURDAY NIGHT...Northeast to east winds near 25 knots. Seas 3 
to 5 feet, occasionally to 6 feet, except 5 to 7 feet, 
occasionally to 9 feet west of the Marquesas Keys. Nearshore 
waters extremely rough. Scattered showers. 
.SUNDAY...Northeast to east winds 20 to 25 knots. Seas 3 to
5 feet, occasionally to 6 feet, subsiding to 2 to 4 feet,
occasionally to 5 feet. West of the Marquesas Keys, seas 5 to 6 
feet, occasionally to 8 feet, subsiding to 4 to 5 feet, 
occasionally to 6 feet. Nearshore waters very rough. Isolated 
showers.
.SUNDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, 
except 4 to 5 feet, occasionally to 6 feet west of the Marquesas 
Keys. Nearshore waters rough, becoming choppy. Scattered showers.
.MONDAY...Northeast winds 15 to 20 knots, briefly decreasing to
near 15 knots in the afternoon. Seas subsiding to 2 to 3 feet. 
Nearshore waters choppy, becoming a moderate chop. Scattered 
showers. 
.MONDAY NIGHT...North to northeast winds 15 to 20 knots. Seas
building to 2 to 4 feet. Nearshore waters choppy. Isolated 
showers.
.TUESDAY...North winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters choppy. Isolated
showers. 
.TUESDAY NIGHT...North winds near 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet, except 5 to 6 feet, occasionally to
8 feet west of the Marquesas Keys. Nearshore waters rough. 
.WEDNESDAY...Northwest to north winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet, except 5 to 6 feet, occasionally
to 8 feet west of the Marquesas Keys. Nearshore waters rough.
Isolated showers. 
.WEDNESDAY NIGHT...Northwest to north winds 20 to 25 knots. Seas
3 to 5 feet, occasionally to 6 feet, except 6 to 7 feet,
occasionally to 9 feet west of the Marquesas Keys. Nearshore
waters very rough. Isolated showers. 

$$

GMZ042>044-250830-
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-
428 PM EDT Fri Oct 24 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast to east winds 20 to 25 knots early,
increasing to near 25 knots. Seas 4 to 6 feet, occasionally to 8 
feet. Nearshore waters very rough, becoming extremely rough. 
Scattered showers.
.SATURDAY...Northeast to east winds near 25 knots. Seas 4 to
7 feet, occasionally to 9 feet. Nearshore waters extremely rough.
Isolated showers. 
.SATURDAY NIGHT...Northeast to east winds near 25 knots. Seas
5 to 7 feet, occasionally to 9 feet. Nearshore waters extremely
rough. Scattered showers. 
.SUNDAY...Northeast to east winds near 25 knots, decreasing to 20
to 25 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8
feet. Nearshore waters extremely rough, becoming very rough. 
Isolated showers. 
.SUNDAY NIGHT...Northeast to east winds decreasing to near 20 
knots. Seas subsiding to 3 to 5 feet, occasionally to 6 feet. 
Nearshore waters becoming rough. Scattered showers. 
.MONDAY...Northeast winds 15 to 20 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Nearshore waters choppy. Isolated
showers. 
.MONDAY NIGHT...North to northeast winds 15 to 20 knots. Seas
2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy.
Scattered showers. 
.TUESDAY...North winds 15 to 20 knots. Seas 2 to 3 feet, except
3 to 4 feet, occasionally to 5 feet west of Cosgrove Shoal Light.
Nearshore waters choppy. Isolated showers. 
.TUESDAY NIGHT...North winds 15 to 20 knots. Seas 2 to 3 feet,
except 4 to 5 feet, occasionally to 6 feet west of Cosgrove Shoal
Light. Nearshore waters choppy. 
.WEDNESDAY...Northwest to north winds near 20 knots. Seas 2 to
3 feet, except 5 to 6 feet, occasionally to 8 feet west of
Cosgrove Shoal Light. Nearshore waters rough. Isolated showers. 
.WEDNESDAY NIGHT...Northwest to north winds 20 to 25 knots. Seas
2 to 4 feet, occasionally to 5 feet, except 5 to 7 feet,
occasionally to 9 feet west of Cosgrove Shoal Light. Nearshore
waters very rough. Isolated showers. 

$$

GMZ052>055-072>075-250830-
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-
428 PM EDT Fri Oct 24 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast to east winds near 25 knots. Seas 8 to
11 feet, occasionally to 14 feet. Wave Detail: Northeast to east
9 feet at 7 seconds. Scattered showers and isolated
thunderstorms. 
.SATURDAY...Northeast to east winds near 25 knots. Seas 8 to
11 feet, occasionally to 14 feet. Wave Detail: Northeast to east
10 feet at 8 seconds. Scattered showers. 
.SATURDAY NIGHT...Northeast to east winds 25 to 30 knots. Seas
8 to 11 feet, occasionally to 14 feet. Wave Detail: Northeast to
east 10 feet at 8 seconds. Scattered showers. 
.SUNDAY...Northeast to east winds near 25 knots, decreasing to 20
to 25 knots. Seas 8 to 10 feet, occasionally to 13 feet, 
subsiding to 6 to 9 feet, occasionally to 11 feet in the 
afternoon. Scattered showers.
.SUNDAY NIGHT...Northeast to east winds 20 to 25 knots. Seas 6 to
8 feet, occasionally to 10 feet. Scattered showers. 
.MONDAY...Northeast winds near 20 knots, decreasing to 15 to 20 
knots. Seas 5 to 7 feet, occasionally to 9 feet. Scattered 
showers. 
.MONDAY NIGHT...North to northeast winds increasing to near 20 
knots. Seas 4 to 7 feet, occasionally to 9 feet. Scattered 
showers. 
.TUESDAY...North winds near 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Isolated showers. 
.TUESDAY NIGHT...North winds 20 to 25 knots. Seas 5 to 6 feet,
occasionally to 8 feet. Isolated showers. 
.WEDNESDAY...Northwest to north winds 20 to 25 knots. Seas 4 to
6 feet, occasionally to 8 feet. Isolated showers. 
.WEDNESDAY NIGHT...Northwest to north winds near 25 knots. Seas 5
to 7 feet, occasionally to 9 feet. Isolated showers. 

$$

GMZ033-034-250830-
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-
428 PM EDT Fri Oct 24 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast to east winds near 20 knots early, increasing
to 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, 
building to 5 to 8 feet, occasionally to 10 feet. Wave Detail: 
Northeast 6 feet at 6 seconds, becoming northeast 7 feet at 6 
seconds. Isolated showers. 
.SATURDAY...Northeast to east winds 20 to 25 knots. Seas 5 to
7 feet, occasionally to 9 feet. Wave Detail: Northeast 7 feet at
6 seconds. Isolated showers. 
.SATURDAY NIGHT...Northeast to east winds near 25 knots. Seas
5 to 8 feet, occasionally to 10 feet. Wave Detail: Northeast to
east 7 feet at 6 seconds. Isolated showers. 
.SUNDAY...Northeast to east winds 20 to 25 knots, decreasing to 
15 to 20 knots in the afternoon. Seas 5 to 7 feet, occasionally to
9 feet, subsiding to 3 to 5 feet, occasionally to 6 feet. 
Isolated showers.
.SUNDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Scattered showers. 
.MONDAY...Northeast winds 15 to 20 knots, decreasing to near 15
knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated 
showers.
.MONDAY NIGHT...North to northeast winds increasing to 15 to 20 
knots. Seas building to 3 to 4 feet, occasionally to 5 feet. 
Isolated showers.
.TUESDAY...North winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Isolated showers. 
.TUESDAY NIGHT...North winds near 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. 
.WEDNESDAY...Northwest to north winds 20 to 25 knots. Seas 4 to 6
feet, occasionally to 8 feet. Isolated showers. 
.WEDNESDAY NIGHT...Northwest to north winds near 25 knots. Seas
5 to 7 feet, occasionally to 9 feet. Isolated showers. 

$$