385
FZUS52 KKEY 102034
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
434 PM EDT Fri Oct 10 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.

GMZ005-110845-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
434 PM EDT Fri Oct 10 2025

.SYNOPSIS...A low- and mid-level trough located over western Cuba
will continue to slowly drift northeastward tonight. This will
support bouts of elevated rain and thunder chances. The system
will develop into an area of low pressure off the coast of
Florida, with southeasterly light to gentle breezes gradually
backing to the northwest to north over the weekend. The low
pressure system 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
through the weekend due to the influence of the low pressure
system.

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.

$$

GMZ031-110845-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
434 PM EDT Fri Oct 10 2025

.TONIGHT...Southwest winds near 10 knots. Bay waters a light
chop. Numerous showers and scattered thunderstorms.
.SATURDAY...Southwest to west winds near 10 knots, becoming west
to northwest. Bay waters a light chop. Numerous showers and
scattered thunderstorms in the morning, then scattered showers and
isolated thunderstorms in the afternoon.
.SATURDAY NIGHT...West to northwest winds 5 to 10 knots. Bay
waters smooth to a light chop. Scattered showers.
.SUNDAY...Northwest winds near 5 knots. Bay waters smooth.
Isolated showers.
.SUNDAY NIGHT...Northwest winds near 5 knots, becoming north to
northeast after midnight. Bay waters smooth. Isolated showers.
.MONDAY...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Isolated showers.
.MONDAY NIGHT...Northeast to east winds near 10 knots, increasing
to 10 to 15 knots. Bay waters a light chop, becoming a light to
moderate chop. Isolated showers.
.TUESDAY...Northeast winds 10 to 15 knots. Bay waters a light to
moderate chop. Isolated showers.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Northeast winds near 15
knots. Bay waters a moderate chop. Isolated showers.

$$

GMZ032-035-110845-
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-
434 PM EDT Fri Oct 10 2025

.TONIGHT...Southwest to west winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Numerous showers
and scattered thunderstorms.
.SATURDAY...Southwest to west winds 5 to 10 knots, becoming west
to northwest. Seas building to 1 to 2 feet, except building to 2
to 3 feet west of the Marquesas Keys due to a northerly swell.
Nearshore waters smooth to a light chop. Numerous showers and
scattered thunderstorms in the morning, then scattered showers and
isolated thunderstorms in the afternoon.
.SATURDAY NIGHT...Northwest winds 5 to 10 knots. Seas 1 to
2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore
waters smooth to a light chop. Isolated showers.
.SUNDAY...Northwest to north winds near 5 knots. Seas 1 to
2 feet. Nearshore waters smooth. Isolated showers.
.SUNDAY NIGHT...North winds 5 to 10 knots, becoming north to
northeast. Seas 1 to 2 feet. Nearshore waters smooth to a light
chop. Isolated showers.
.MONDAY...North to northeast winds 5 to 10 knots, becoming
northeast. Seas 1 to 2 feet. Nearshore waters smooth to a light
chop. Isolated showers.
.MONDAY NIGHT...Northeast to east winds near 10 knots, increasing
to 10 to 15 knots. 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.
.TUESDAY...Northeast 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.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Northeast winds 15 to 20
knots. Seas 2 to 3 feet. Nearshore waters choppy. Isolated
showers.

$$

GMZ042>044-110845-
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-
434 PM EDT Fri Oct 10 2025

.TONIGHT...Southwest to west winds 5 to 10 knots, increasing to
near 10 knots. Seas around 1 foot, building to 1 to 2 feet.
Nearshore waters smooth to a light chop, becoming a light chop.
Numerous showers and scattered thunderstorms.
.SATURDAY...Southwest to west winds near 10 knots, becoming west
to northwest. Seas 1 to 2 feet, except around 2 feet west of
Cosgrove Shoal Light. Nearshore waters light chop. Numerous
showers and scattered thunderstorms in the morning, then scattered
showers and isolated thunderstorms in the afternoon.
.SATURDAY NIGHT...West to northwest winds 5 to 10 knots. Seas
1 to 2 feet, except around 2 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...North winds 5 to 10 knots, becoming north to
northeast. Seas 1 to 2 feet. Nearshore waters smooth to a light
chop. Isolated showers.
.MONDAY...North to northeast winds 5 to 10 knots, becoming
northeast to east and increasing to near 10 knots. Seas 1 to 2
feet. Nearshore waters smooth to a light chop, becoming a light
chop. Isolated showers.
.MONDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
around 2 feet. Nearshore waters 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 THROUGH WEDNESDAY NIGHT...Northeast winds 15 to 20
knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters
choppy. Isolated showers.

$$

GMZ052>055-072>075-110845-
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-
434 PM EDT Fri Oct 10 2025

.TONIGHT...Southwest to west winds 5 to 10 knots, increasing to
10 to 15 knots. Seas around 2 feet, building to 2 to 3 feet. Wave
Detail: South to southwest 2 feet at 3 seconds and west to
northwest 1 foot at 5 seconds. Numerous showers and scattered
thunderstorms.
.SATURDAY...Southwest to west winds 10 to 15 knots, becoming west
to northwest. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: West to northwest 3 feet at 6 seconds and south to
southwest 2 feet at 3 seconds. Numerous showers and scattered
thunderstorms in the morning, then scattered showers and isolated
thunderstorms in the afternoon.
.SATURDAY NIGHT...West to northwest winds near 10 knots,
decreasing to 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: West
3 feet at 7 seconds. Scattered showers.
.SUNDAY...Northwest winds near 5 knots. Seas 1 to 3 feet. Isolated
showers.
.SUNDAY NIGHT...North to northeast winds near 5 knots. Seas 1 to
3 feet. Isolated showers.
.MONDAY...Northeast winds 5 to 10 knots, increasing to near 10
knots. Seas 1 to 2 feet, building to 2 to 3 feet. Isolated
showers.
.MONDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas 2 to
4 feet, occasionally to 5 feet. Isolated showers.
.TUESDAY THROUGH WEDNESDAY NIGHT...Northeast winds 15 to 20
knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered
showers.

$$

GMZ033-034-110845-
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-
434 PM EDT Fri Oct 10 2025

.TONIGHT...Variable winds 5 to 10 knots, becoming northwest to
north and increasing to near 10 knots. Seas 2 to 3 feet. Wave
Detail: Northwest to north 3 feet at 7 seconds. Numerous showers
and scattered thunderstorms.
.SATURDAY...Northwest to north winds near 10 knots. Seas 2 to 3
feet. Wave Detail: Northwest to north 3 feet at 7 seconds.
Scattered showers. Scattered thunderstorms, mainly in the morning.
.SATURDAY NIGHT...Northwest to north winds 5 to 10 knots. Seas
2 to 3 feet. Wave Detail: Northwest to north 3 feet at 6 seconds.
Isolated showers.
.SUNDAY...North winds 5 to 10 knots. Seas 2 to 3 feet. Scattered
showers.
.SUNDAY NIGHT...North to northeast winds near 10 knots. Seas 2 to
3 feet. Isolated showers.
.MONDAY...North to northeast winds 10 to 15 knots. Seas around 2
feet. Isolated showers.
.MONDAY NIGHT...Northeast winds 10 to 15 knots. Seas around 2
feet. Isolated showers.
.TUESDAY...Northeast winds near 15 knots. Seas 2 to 3 feet.
Isolated showers.
.TUESDAY NIGHT...Northeast winds near 15 knots, becoming
northeast to east and increasing to 15 to 20 knots. Seas 2 to 3
feet. Isolated showers.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds 15 to 20
knots. Seas 2 to 4 feet, occasionally to 5 feet. Isolated
showers.

$$

BT/MJV