222
FZUS52 KKEY 180817
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
417 AM EDT Sat Oct 18 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.

GMZ005-182030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
417 AM EDT Sat Oct 18 2025

.SYNOPSIS...High pressure over the southeastern CONUS is
responsible for Small Craft Advisory conditions across the
Florida Keys today. The high will shift east into the Atlantic and
allow a weak warm frontal pattern to lift north across the Keys
coastal waters. Shower and thunder chances will be elevated from
Sunday to Monday. Drier air will push over the Keys by mid week
while a low pressure system over the eastern CONUS. Gentle to
moderate breezes will start to freshen mid week as another high
builds over the eastern CONUS.

The Approximate Shoreward Edge of the Gulf Stream as of
October 15...

63 NM South of Dry Tortugas Light...on Loggerhead Key.
42 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
33 NM South of Sand Key Light...off Key West.
23 NM South of Looe Key...off Big Pine Key.
16 NM Southeast of Sombrero Key Light...off Marathon.
22 NM Southeast of Alligator Reef Light...off Islamorada.
20 NM Southeast of Molasses Reef Light...off Key Largo.
18 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.

$$

GMZ031-182030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
417 AM EDT Sat Oct 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...Northeast to east winds near 20 knots. Bay waters rough.
Isolated showers.
.TONIGHT...East winds decreasing to 15 to 20 knots. Bay waters
becoming choppy. Isolated showers.
.SUNDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Bay waters a moderate chop, becoming a light to
moderate chop. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT AND MONDAY...East to southeast winds near 10 knots.
Bay waters a light chop. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East winds 10 to 15 knots. Bay waters a light to
moderate chop. Scattered showers.
.TUESDAY AND TUESDAY NIGHT...Northeast to east winds 10 to 15
knots. Bay waters a light to moderate chop. Isolated showers.
.WEDNESDAY...Northeast to east winds near 10 knots. Bay waters a
light chop. Isolated showers.
.WEDNESDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay
waters a light to moderate chop. Isolated showers.

$$

GMZ032-035-182030-
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-
417 AM EDT Sat Oct 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...East winds near 20 knots. Seas 1 to 3 feet, except 3 to
4 feet, occasionally to 5 feet west of the Marquesas Keys.
Nearshore waters rough. Isolated showers.
.TONIGHT...East winds decreasing to 15 to 20 knots. Seas 2 to 3
feet, except 3 to 4 feet, occasionally to 5 feet west of the
Marquesas Keys. Nearshore waters becoming choppy. Isolated
showers.
.SUNDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 1 to 3 feet. Nearshore waters a moderate chop,
becoming a light to moderate chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...East to southeast winds near 10 knots. Seas
subsiding to around 1 foot. Nearshore waters a light chop.
Scattered showers and isolated thunderstorms.
.MONDAY...East winds near 10 knots. Seas around 1 foot. Nearshore
waters a light chop. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Scattered showers.
.TUESDAY AND TUESDAY NIGHT...East winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop. Isolated
showers.
.WEDNESDAY...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Isolated showers.
.WEDNESDAY NIGHT...Northeast to east winds 10 to 15 knots,
increasing to near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet
west of the Marquesas Keys. Nearshore waters a light to moderate
chop, becoming a moderate chop. Isolated showers.


$$

GMZ042>044-182030-
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-
417 AM EDT Sat Oct 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...East winds near 20 knots. Seas 3 to 4 feet, occasionally
to 5 feet. Nearshore waters rough. Isolated showers.
.TONIGHT...East to southeast winds decreasing to 15 to 20 knots.
Seas subsiding to 2 to 4 feet, occasionally to 5 feet. Nearshore
waters becoming choppy. Scattered showers.
.SUNDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop,
becoming a light to moderate chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to
3 feet. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.MONDAY...East winds near 10 knots. Seas 1 to 2 feet. Nearshore
waters a light chop. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 3 feet.
Nearshore waters a light to moderate chop. Scattered showers.
.TUESDAY...East winds 10 to 15 knots. Seas 1 to 3 feet. Nearshore
waters a light to moderate chop. Scattered showers.
.TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
1 to 3 feet. Nearshore waters a light to moderate chop. Isolated
showers.
.WEDNESDAY...Northeast winds 10 to 15 knots. Seas 1 to 3 feet.
Nearshore waters a light to moderate chop. Isolated showers.
.WEDNESDAY NIGHT...Northeast to east winds increasing to 15
knots. Seas 2 to 3 feet. Nearshore waters becoming a moderate
chop. Isolated showers.

$$

GMZ052>055-072>075-182030-
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-
417 AM EDT Sat Oct 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...East winds near 20 knots. Seas 5 to 7 feet, occasionally
to 8 feet. Wave Detail: Northeast to east 5 feet at 6 seconds.
Isolated showers.
.TONIGHT...East to southeast winds decreasing to 15 to 20 knots.
Seas subsiding to 3 to 5 feet, occasionally to 6 feet. Wave
Detail: East 5 feet at 6 seconds. Scattered showers.
.SUNDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas subsiding to 2 to 4 feet, occasionally to 5
feet. Wave Detail: East to southeast 4 feet at 6 seconds.
Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...East to southeast winds 10 to 15 knots. Seas 2 to
4 feet. Scattered showers and isolated thunderstorms.
.MONDAY...East winds near 10 knots. Seas 1 to 3 feet. Scattered
showers and isolated thunderstorms.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet.
Scattered showers.
.TUESDAY...East winds 10 to 15 knots. Seas 2 to 4 feet. Scattered
showers.
.TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
2 to 4 feet. Isolated showers.
.WEDNESDAY...Northeast winds 10 to 15 knots, increasing to near 15
knots. Seas 2 to 4 feet. Isolated showers.
.WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
3 to 5 feet, occasionally to 6 feet. Isolated showers.

$$

GMZ033-034-182030-
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-
417 AM EDT Sat Oct 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...East winds near 20 knots. Seas 3 to 5 feet, occasionally
to 6 feet. Wave Detail: East 4 feet at 5 seconds. Isolated
showers.
.TONIGHT...East to southeast winds decreasing to 15 to 20 knots.
Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East to
southeast 4 feet at 5 seconds. Isolated showers.
.SUNDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas subsiding to 2 to 3 feet. Wave Detail: East to
southeast 3 feet at 5 seconds. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to
2 feet. Scattered showers and isolated thunderstorms.
.MONDAY...East winds near 10 knots. Seas around 1 foot. Scattered
showers and isolated thunderstorms.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Isolated showers.
.TUESDAY...East winds 10 to 15 knots. Seas 1 to 2 feet. Isolated
showers.
.TUESDAY NIGHT...Northeast to east winds near 10 knots. Seas 1 to
2 feet. Isolated showers.
.WEDNESDAY...North to northeast winds 10 to 15 knots. Seas 1 to
2 feet. Isolated showers.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 3 feet. Isolated showers.

$$

AJP