469
FZUS52 KKEY 172027
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
427 PM EDT Fri Oct 17 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.

GMZ005-180830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
427 PM EDT Fri Oct 17 2025

.SYNOPSIS...A high pressure system moving into the southeastern
CONUS will gradually shift out across the Atlantic by Sunday.
This will maintain moderate to fresh breezes overnight through at
least Saturday evening. As the high slides east on Sunday, a warm
front will lift north across the Florida Keys and surrounding
coastal waters. This will lead to higher than normal rain and
thunder chances. By Monday, a new cold front will gradually press
through the area. Outside of peaks and lull or convection, breezes
will generally slacken through early next week then freshen late
in the week as the next high builds in.

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.

$$

GMZ031-180830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
427 PM EDT Fri Oct 17 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast to east winds 15 to 20 knots, increasing to near
20 knots. Bay waters choppy, becoming rough.
.SATURDAY...Northeast to east winds 15 to 20 knots. Bay waters
choppy.
.SATURDAY NIGHT...East winds near 15 knots. Bay waters a moderate
chop. Isolated showers.
.SUNDAY...East winds 10 to 15 knots. Bay waters a light to
moderate chop. Isolated showers in the morning, then scattered
showers and isolated thunderstorms in the afternoon.
.SUNDAY NIGHT...East winds 10 to 15 knots. Bay waters a light to
moderate chop. Scattered showers and isolated thunderstorms.
.MONDAY...East winds increasing to near 15 knots. Bay waters
becoming a moderate chop. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT AND TUESDAY...Northeast to east winds near 15
knots. Bay waters a moderate chop. Scattered showers.
.TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay
waters a light to moderate chop. Isolated showers.
.WEDNESDAY...Northeast winds 10 to 15 knots. Bay waters a light
to moderate chop. Isolated showers.
.WEDNESDAY NIGHT...Northeast to east winds near 15 knots. Bay
waters a moderate chop. Isolated showers.

$$

GMZ032-035-180830-
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-
427 PM EDT Fri Oct 17 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast to east winds 15 to 20 knots, increasing to
near 20 knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally
to 5 feet west of the Marquesas Keys. Nearshore waters choppy,
becoming rough. Isolated showers.
.SATURDAY...East winds 15 to 20 knots. Seas 2 to 3 feet, except
3 to 5 feet, occasionally to 6 feet west of the Marquesas Keys.
Nearshore waters choppy. Isolated showers.
.SATURDAY NIGHT...East winds 15 to 20 knots, decreasing to near 15
knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5
feet west of the Marquesas Keys. Nearshore waters choppy, becoming
a moderate chop. Isolated showers.
.SUNDAY...East winds decreasing to 10 to 15 knots. Seas 1 to 3
feet, subsiding to 1 to 2 feet. Nearshore waters becoming a light
to moderate chop. Isolated showers in the morning, then scattered
showers and isolated thunderstorms in the afternoon.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Scattered showers and
isolated thunderstorms.
.MONDAY...East winds near 15 knots. Seas 1 to 2 feet, except 2 to
3 feet west of the Marquesas Keys. Nearshore waters a moderate
chop. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...Northeast to east winds near 15 knots. Seas 1 to
2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore
waters a moderate chop. Scattered showers.
.TUESDAY...Northeast to east winds near 15 knots. Seas 1 to
2 feet. Nearshore waters a moderate chop. Scattered showers.
.TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
1 to 2 feet. Nearshore waters a light to moderate chop. Isolated
showers.
.WEDNESDAY...Northeast winds 10 to 15 knots. Seas 1 to 2 feet,
except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a
light to moderate chop. Isolated showers.
.WEDNESDAY NIGHT...Northeast to east winds near 15 knots. Seas
1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys.
Nearshore waters a moderate chop. Isolated showers.

$$

GMZ042>044-180830-
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-
427 PM EDT Fri Oct 17 2025

...SMALL CRAFT ADVISORY IN EFFECT...

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

$$

GMZ052>055-072>075-180830-
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-
427 PM EDT Fri Oct 17 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...Northeast to east winds near 20 knots. Seas 4 to
7 feet, occasionally to 9 feet. Wave Detail: Northeast to east
6 feet at 6 seconds. Scattered showers.
.SATURDAY...East winds 15 to 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Wave Detail: Northeast to east 5 feet at
6 seconds. Isolated showers.
.SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Wave Detail: East 5 feet at 6 seconds.
Scattered showers and isolated thunderstorms.
.SUNDAY...East winds near 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet,
subsiding to 2 to 3 feet. Scattered showers and isolated
thunderstorms.
.MONDAY...Northeast to east winds increasing to 15 to 20 knots.
Seas building to 2 to 4 feet, occasionally to 5 feet. Scattered
showers and isolated thunderstorms.
.MONDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Scattered showers and isolated
thunderstorms.
.TUESDAY...Northeast to east winds near 15 knots. Seas 3 to
4 feet, occasionally to 5 feet. Scattered showers.
.TUESDAY NIGHT...Northeast to east winds near 15 knots. Seas 3 to
4 feet, occasionally to 5 feet. Isolated showers.
.WEDNESDAY...Northeast winds increasing to 15 to 20 knots. Seas 3
to 5 feet, occasionally to 6 feet. Isolated showers.
.WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
4 to 6 feet. Isolated showers.

$$

GMZ033-034-180830-
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-
427 PM EDT Fri Oct 17 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.TONIGHT...East winds 15 to 20 knots, increasing to near 20 knots.
Seas 2 to 4 feet, occasionally to 5 feet, building to 4 to 5
feet, occasionally to 6 feet. Wave Detail: Northeast to east 4
feet at 5 seconds. Isolated showers.
.SATURDAY...East winds 15 to 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: Northeast to east 4 feet at
5 seconds. Isolated showers.
.SATURDAY NIGHT...East winds 15 to 20 knots, decreasing to near 15
knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail:
East 4 feet at 5 seconds. Isolated showers.
.SUNDAY...East winds decreasing to 10 to 15 knots. Seas 2 to 3
feet. Isolated showers in the morning, then scattered showers and
isolated thunderstorms in the afternoon.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.MONDAY...Northeast to east winds 10 to 15 knots. Seas 2 to
3 feet. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...Northeast to east winds near 15 knots. Seas 2 to
3 feet. Scattered showers.
.TUESDAY...Northeast to east winds 10 to 15 knots. Seas 1 to
3 feet. Scattered showers.
.TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
1 to 2 feet. Isolated showers.
.WEDNESDAY...Northeast winds near 15 knots. Seas 2 to 3 feet.
Isolated showers.
.WEDNESDAY NIGHT...Northeast to east winds near 15 knots. Seas
2 to 3 feet. Isolated showers.

$$