561
FZUS52 KKEY 112017
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
417 PM EDT Sat Oct 11 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.

GMZ005-120830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
417 PM EDT Sat Oct 11 2025

.SYNOPSIS...An elongated area of low pressure across the Keys will
continue slowly drifting northeastward today. This will support
one more day of well above normal rain chances along with south to
southwesterly light to gentle breezes gradually backing to the
northwest to north tonight and Sunday. This low will continue
organizing and strengthening as it heads northeastward adjacent to
the Mid- Atlantic coast. As it does this, it will drive an early
season cold front towards the Keys, further shifting winds to the
north to northeast. Northerly swells will be possible in our
western marine zones today and tonight due to the influence of the
low pressure system. In the wake of the front, high pressure
builds across the eastern United States leading to freshening
northeasterly breezes heading towards mid- week.

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.

$$

GMZ031-120830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
417 PM EDT Sat Oct 11 2025

.TONIGHT...Southeast winds near 10 knots early, becoming
northwest 5 to 10 knots. Bay waters a light chop, becoming smooth
to a light chop. Isolated showers.
.SUNDAY...Northwest to north winds near 5 knots, becoming
southwest to west. Bay waters smooth. Isolated showers.
.SUNDAY NIGHT...West to northwest winds near 5 knots, becoming
north after midnight. Bay waters smooth. Isolated showers.
.MONDAY...North to northeast winds near 5 knots. Bay waters
smooth. Isolated showers.
.MONDAY NIGHT...Northeast winds 5 to 10 knots, increasing to near 10
knots after midnight. Bay waters smooth to a light chop, becoming
a light chop. Isolated showers.
.TUESDAY...Northeast winds 10 to 15 knots. Bay waters a light to
moderate chop. Isolated showers.
.TUESDAY NIGHT...Northeast winds near 15 knots. Bay waters a
moderate chop. Isolated showers.
.WEDNESDAY...Northeast winds near 15 knots, decreasing to near 10
knots. Bay waters a moderate chop, becoming a light chop.
Isolated showers.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 knots. Bay waters a
light to moderate chop. Isolated showers.

$$

GMZ032-035-120830-
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 PM EDT Sat Oct 11 2025

.TONIGHT...West to northwest winds 5 to 10 knots, becoming
northwest to north. Seas 1 to 2 feet. Nearshore waters smooth to
a light chop. Isolated showers.
.SUNDAY...Northwest to north winds near 5 knots. Seas 1 to 2
feet, except 2 to 3 feet west of the Marquesas Keys due to a
northerly swell. Nearshore waters smooth. Isolated showers.
.SUNDAY NIGHT...Northwest to north winds 5 to 10 knots, becoming
north to northeast after midnight. Seas 1 to 2 feet. Nearshore
waters smooth to a light chop. Isolated showers.
.MONDAY...North to northeast winds 5 to 10 knots. Seas 1 to 2
feet. Nearshore waters smooth to a light chop. Isolated showers.
.MONDAY NIGHT...North to northeast winds 5 to 10 knots,
becoming northeast and increasing to 10 to 15 knots after
midnight. Seas 1 to 2 feet, except building to around 2 feet west
of the Marquesas Keys. Nearshore waters smooth to a light chop,
becoming a light to moderate chop. Isolated showers.
.TUESDAY...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.
.TUESDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots. Seas 1 to 2 feet, building to 1 to 3 feet. West of
the Marquesas Keys, seas 2 to 3 feet, building to around 3 feet.
Nearshore waters a moderate chop, becoming choppy. Isolated
showers.
.WEDNESDAY...Northeast winds 15 to 20 knots, decreasing to 10 to
15 knots. Seas 1 to 3 feet, except around 3 feet west of the
Marquesas Keys. Nearshore waters choppy, becoming a light to
moderate chop. Isolated showers.
.WEDNESDAY NIGHT...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.

$$

GMZ042>044-120830-
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 PM EDT Sat Oct 11 2025

.TONIGHT...Southeast to south 5 to 10 knots early, becoming
northwest. Seas 1 foot, except 2 to 3 feet west of Cosgrove Shoal
Light. Nearshore waters smooth to a light chop. Isolated showers.
.SUNDAY...Northwest winds near 5 knots. Seas 1 to 2 feet.
Nearshore waters smooth. Isolated showers.
.SUNDAY NIGHT...Northwest to north winds 5 to 10 knots, becoming
north to northeast after midnight. Seas 1 to 2 feet. Nearshore
waters smooth to a light chop, becoming smooth. Isolated showers.
.MONDAY...North to northeast winds 5 to 10 knots. Seas 1 to
2 feet. Nearshore waters smooth to a light chop. Isolated
showers.
.MONDAY NIGHT...Northeast winds 5 to 10 knots, increasing to
10 to 15 knots after midnight. Seas 1 to 2 feet, building to
around 2 feet. Nearshore waters smooth to a light chop, becoming a
light to moderate chop. Isolated showers.
.TUESDAY...Northeast winds near 15 knots. Seas 2 to 3 feet.
Nearshore waters a moderate chop. Isolated showers.
.TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Nearshore waters choppy.
Scattered showers.
.WEDNESDAY...Northeast winds 15 to 20 knots, decreasing to 10 to
15 knots. Seas 2 to 4 feet, occasionally to 5 feet, subsiding to
2 to 3 feet. Nearshore waters choppy, becoming a light to moderate
chop. Scattered showers.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 knots. Seas around 2
feet. Nearshore waters a light to moderate chop. Isolated
showers.

$$

GMZ052-053-072-073-120830-
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 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-
417 PM EDT Sat Oct 11 2025

.TONIGHT...Southeast to south winds near 10 knots early, becoming
west to northwest 5 to 10 knots. Seas 2 to 3 feet, subsiding to
around 2 feet. Wave Detail: South to southwest 2 feet at 5 seconds
and north to northeast 1 foot at 10 seconds. Scattered showers.
.SUNDAY...West to northwest winds 5 to 10 knots, decreasing to
near 5 knots. Seas 1 to 2 feet. Wave Detail: West 1 foot at 7
seconds and north to northeast 1 foot at 10 seconds. Isolated
showers.
.SUNDAY NIGHT...West to northwest winds near 5 knots, becoming
north. Seas 1 to 2 feet. Isolated showers.
.MONDAY...North winds near 5 knots, becoming north to northeast
and increasing to 5 to 10 knots. Seas 1 to 2 feet. Isolated
showers.
.MONDAY NIGHT...Northeast winds near 10 knots. Seas around 2
feet. Scattered showers.
.TUESDAY...Northeast winds 10 to 15 knots, increasing to near 15
knots. Seas 2 to 4 feet, occasionally to 5 feet, building to 3 to
4 feet, occasionally to 5 feet. Scattered showers.
.TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Scattered showers.
.WEDNESDAY...Northeast winds near 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Scattered showers.
.WEDNESDAY NIGHT...Northeast winds near 15 knots. Seas 3 to 4
feet, occasionally to 5 feet. Isolated showers.

$$

GMZ054-055-074-075-120830-
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 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 PM EDT Sat Oct 11 2025

.TONIGHT...Southwest to west winds 5 to 10 knots early, becoming
northwest. Seas 2 to 4 feet, occasionally to 5 feet, due to a
northerly swell. Wave Detail:
West to northwest 3 feet at 7 seconds. Isolated showers.
.SUNDAY...Northwest winds near 5 knots, becoming northwest to
north. Seas 2 to 3 feet. Wave Detail: West to northwest 3 feet at
7 seconds. Isolated showers.
.SUNDAY NIGHT...North to northeast winds 5 to 10 knots. Seas 2 to
3 feet. Isolated showers.
.MONDAY...North to northeast winds 5 to 10 knots, increasing to
near 10 knots. Seas around 2 feet. Scattered showers.
.MONDAY NIGHT...Northeast winds 10 to 15 knots. Seas 2 to 3 feet.
Isolated showers.
.TUESDAY...Northeast 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. Isolated showers.
.TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Scattered showers.
.WEDNESDAY...Northeast winds near 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Scattered showers.
.WEDNESDAY NIGHT...Northeast to east winds near 15 knots. Seas
3 to 4 feet, occasionally to 5 feet. Scattered showers.

$$

GMZ033-034-120830-
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 PM EDT Sat Oct 11 2025

.TONIGHT...Northwest to north winds near 10 knots early,
decreasing to 5 to 10 knots. Seas 2 to 4 feet due to a northerly
swell. Wave Detail: Northwest to north 3 feet at 6 seconds.
Isolated showers.
.SUNDAY...North winds 5 to 10 knots. Seas 2 to 3 feet due to a
northerly swell. Wave Detail: Northwest 2 feet at 6 seconds.
Isolated showers.
.SUNDAY NIGHT...North winds 5 to 10 knots, becoming north to
northeast. Seas 2 to 3 feet. Isolated showers.
.MONDAY...North to northeast winds 5 to 10 knots, increasing to
near 10 knots. Seas 2 to 3 feet. Isolated showers.
.MONDAY NIGHT...North to northeast winds near 10 knots, becoming
northeast and increasing to 10 to 15 knots. Seas 2 to 3 feet.
Isolated showers.
.TUESDAY...Northeast winds 10 to 15 knots. Seas 2 to 3 feet.
Isolated showers.
.TUESDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots. Seas 2 to 3 feet, building to 2 to 4 feet,
occasionally to 5 feet. Isolated showers.
.WEDNESDAY...Northeast winds 15 to 20 knots, decreasing to 10 to
15 knots. Seas 2 to 4 feet, occasionally to 5 feet, subsiding to
2 to 3 feet. Isolated showers.
.WEDNESDAY NIGHT...Northeast winds near 15 knots. Seas 2 to 3
feet. Isolated showers.

$$