197
FZUS52 KKEY 130822
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
422 AM EDT Mon Oct 13 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.

GMZ005-132030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
422 AM EDT Mon Oct 13 2025

.SYNOPSIS...Low pressure departs the Northeast and Mid-Atlantic
coastline today. High pressure builds in behind it across much of
the eastern United States. This will promote peaking and lulling
mainly northeasterly breezes through much of the period. Breezes
will peak mostly during the late evenings to mornings and lull in
the afternoons.

The Approximate Shoreward Edge of the Gulf Stream as of October
08...

46 NM South of Dry Tortugas Light...on Loggerhead Key.
27 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
21 NM South of Sand Key Light...off Key West.
30 NM South of Looe Key...off Big Pine Key.
14 NM Southeast of Sombrero Key Light...off Marathon.
 8 NM Southeast of Alligator Reef Light...off Islamorada.
 7 NM Southeast of Molasses Reef Light...off Key Largo.
 6 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.

$$

GMZ031-132030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
422 AM EDT Mon Oct 13 2025

.TODAY...North to northeast winds 5 to 10 knots, becoming
northeast to east and increasing to 10 to 15 knots. Bay waters
smooth to a light chop, becoming a light to moderate chop.
Isolated showers.
.TONIGHT AND TUESDAY...Northeast winds near 15 knots. Bay waters
a moderate chop. Isolated showers.
.TUESDAY NIGHT...Northeast winds 15 to 20 knots, becoming north to
northeast and decreasing to near 15 knots. Bay waters choppy,
becoming a moderate chop. Isolated showers.
.WEDNESDAY...North to northeast winds 10 to 15 knots, becoming
northeast and decreasing to 5 to 10 knots in the afternoon. Bay
waters a light to moderate chop, becoming smooth to a light chop.
Isolated showers.
.WEDNESDAY NIGHT...Northeast winds 5 to 10 knots, becoming north
to northeast and increasing to near 10 knots. Bay waters smooth
to a light chop, becoming a light chop. Isolated showers.
.THURSDAY...North to northeast winds near 10 knots, becoming
northeast to east. Bay waters a light chop. Isolated showers.
.THURSDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay
waters a light to moderate chop. Isolated showers.
.FRIDAY...Northeast to east winds near 15 knots, increasing to 15
to 20 knots. Bay waters a moderate chop, becoming choppy.
Isolated showers.
.FRIDAY NIGHT...Northeast to east winds 15 to 20 knots. Bay
waters choppy. Isolated showers.

$$

GMZ032-035-132030-
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-
422 AM EDT Mon Oct 13 2025

.TODAY...North to northeast winds 5 to 10 knots, becoming
northeast and increasing to 10 to 15 knots. Seas 1 to 2 feet,
except building to 2 to 3 feet west of the Marquesas Keys.
Nearshore waters smooth to a light chop, becoming a light to
moderate chop. Isolated showers.
.TONIGHT...Northeast 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.
.TUESDAY...Northeast winds 15 to 20 knots, becoming northeast to
east and decreasing to 10 to 15 knots in the afternoon. Seas
around 2 feet, subsiding to 1 to 2 feet. West of the Marquesas
Keys, seas around 3 feet, subsiding to 2 to 3 feet. Nearshore
waters choppy, becoming a light to moderate chop. Isolated
showers.
.TUESDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots. Seas 1 to 2 feet, building to around 2 feet, except
2 to 3 feet west of the Marquesas Keys. Nearshore waters a
moderate chop, becoming choppy. Isolated showers.
.WEDNESDAY...Northeast winds 15 to 20 knots, decreasing to 10 to
15 knots. Seas around 2 feet, subsiding to 1 to 2 feet. West of
the Marquesas Keys, seas 2 to 4 feet, occasionally to 5 feet,
subsiding to 2 to 3 feet. Nearshore waters choppy, becoming a
light to moderate chop. Isolated showers.
.WEDNESDAY NIGHT...Northeast winds near 10 knots, increasing to
10 to 15 knots after midnight. Seas 1 to 2 feet, except around 2
feet west of the Marquesas Keys. Nearshore waters a light chop,
becoming a light to moderate chop. Isolated showers.
.THURSDAY...Northeast winds 10 to 15 knots, becoming northeast to
east and decreasing to 5 to 10 knots in the afternoon. Seas 1 to
2 feet, subsiding to around 1 foot. West of the Marquesas Keys,
seas around 2 feet, subsiding to 1 to 2 feet. Nearshore waters a
light to moderate chop, becoming smooth to a light chop. Isolated
showers.
.THURSDAY NIGHT...Northeast to east winds 10 to 15 knots,
increasing to near 15 knots. Seas 1 to 2 feet, except around 2
feet west of the Marquesas Keys. Nearshore waters a light to
moderate chop, becoming a moderate chop. Isolated showers.
.FRIDAY...Northeast to east winds 15 to 20 knots. Seas 1 to 3
feet, except building to 3 to 4 feet, occasionally to 5 feet west
of the Marquesas Keys. Nearshore waters choppy. Isolated showers.
.FRIDAY NIGHT...East winds near 20 knots. Seas 2 to 3 feet,
except around 4 feet, occasionally to 5 feet west of the
Marquesas Keys. Nearshore waters rough. Isolated showers.

$$

GMZ042>044-132030-
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-
422 AM EDT Mon Oct 13 2025

.TODAY...North to northeast winds 5 to 10 knots, becoming
northeast and increasing to 10 to 15 knots. Seas 1 to 2 feet,
except 2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters
smooth to a light chop, becoming a light to moderate chop.
Isolated showers.
.TONIGHT...Northeast winds 10 to 15 knots, increasing to near 15
knots. Seas 2 to 3 feet. Nearshore waters a light to moderate
chop, becoming a moderate chop. Isolated showers and
thunderstorms.
.TUESDAY...Northeast winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters choppy. Isolated
showers.
.TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Nearshore waters choppy. Isolated
showers.
.WEDNESDAY...Northeast winds 15 to 20 knots, decreasing to 10 to
15 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5
feet, subsiding to 2 to 3 feet. Nearshore waters choppy, becoming
a light to moderate chop. Isolated showers.
.WEDNESDAY NIGHT...Northeast winds near 10 knots, increasing to 10
to 15 knots. Seas around 2 feet. Nearshore waters a light chop,
becoming a light to moderate chop. Isolated showers.
.THURSDAY...Northeast winds 10 to 15 knots. Seas around 2 feet.
Nearshore waters a light to moderate chop. Isolated showers.
.THURSDAY NIGHT...Northeast to east winds 10 to 15 knots,
increasing to near 15 knots. Seas around 2 feet, building to 2 to
3 feet. Nearshore waters a light to moderate chop, becoming a
moderate chop. Isolated showers.
.FRIDAY...Northeast to east winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Nearshore waters choppy. Isolated
showers.
.FRIDAY NIGHT...East winds near 20 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Nearshore waters rough. Scattered
showers.

$$

GMZ052>055-072>075-132030-
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-
422 AM EDT Mon Oct 13 2025

.TODAY...North to northeast winds 5 to 10 knots, becoming
northeast and increasing to 10 to 15 knots. Seas 2 to 3 feet.
Wave Detail: Northeast 2 feet at 4 seconds and west to northwest 2
feet at 6 seconds. Isolated showers.
.TONIGHT...Northeast to east winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 3 feet, building to 2 to 4 feet,
occasionally to 5 feet. Wave Detail: Northeast 3 feet at 4 seconds
and west to northwest 1 foot at 5 seconds. Scattered showers and
isolated thunderstorms.
.TUESDAY...Northeast winds 15 to 20 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: Northeast 4 feet at 5
seconds. Scattered showers.
.TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Scattered showers.
.WEDNESDAY...Northeast winds 15 to 20 knots, decreasing to 10 to
15 knots in the afternoon. Seas 3 to 6 feet, occasionally to 7
feet, subsiding to 2 to 4 feet, occasionally to 5 feet. Isolated
showers.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 knots. Seas 2 to
4 feet, occasionally to 5 feet. Isolated showers.
.THURSDAY...Northeast winds 10 to 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Isolated showers.
.THURSDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
2 to 4 feet, occasionally to 5 feet. Scattered showers.
.FRIDAY...Northeast to east winds 10 to 15 knots, increasing to
15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet,
building to 4 to 6 feet, occasionally to 7 feet. Scattered
showers.
.FRIDAY NIGHT...East winds near 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Scattered showers.

$$

GMZ033-034-132030-
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-
422 AM EDT Mon Oct 13 2025

.TODAY...North to northeast winds near 10 knots, becoming
northeast and increasing to 10 to 15 knots. Seas 2 to 3 feet.
Wave Detail: North 2 feet at 4 seconds. Isolated showers.
.TONIGHT...Northeast winds 10 to 15 knots, increasing to near 15
knots. Seas 2 to 3 feet. Wave Detail: North 2 feet at 4 seconds.
Isolated showers.
.TUESDAY...Northeast winds 15 to 20 knots, decreasing to near 15
knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet.
Wave Detail: Northeast 3 feet at 4 seconds. Isolated showers.
.TUESDAY NIGHT...Northeast winds 10 to 15 knots, increasing to
15 to 20 knots after midnight. Seas 2 to 3 feet. Isolated
showers.
.WEDNESDAY...Northeast winds 15 to 20 knots, decreasing to 10 to
15 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5
feet. Isolated showers.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 knots. Seas 2 to
3 feet. Isolated showers.
.THURSDAY...Northeast winds 10 to 15 knots. Seas around 2 feet.
Isolated showers.
.THURSDAY NIGHT...Northeast to east winds 10 to 15 knots,
increasing to near 15 knots. Seas around 2 feet, building to 2 to
3 feet. Isolated showers.
.FRIDAY...East winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Isolated showers.
.FRIDAY NIGHT...East winds near 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Isolated showers.

$$

MJV