201
FZUS52 KKEY 100826
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
426 AM 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.

GMZ005-102030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
426 AM EDT Fri Oct 10 2025

.SYNOPSIS...A non-tropical surface low located over western Cuba
will continue to slowly drift northward today and then north
northeastward tonight. This will support bouts of elevated rain
and thunder chances. The low will initially support light to
gentle southeast to south breezes this morning. However, as the
low moves north northeastward, breezes will veer to the northwest
to north over the weekend. Low pressure 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.

$$

GMZ031-102030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
426 AM EDT Fri Oct 10 2025

.TODAY...Southeast to south winds near 5 knots, becoming south to
southwest and increasing to 5 to 10 knots late. Bay waters
smooth, becoming smooth to a light chop. Widespread showers and
scattered thunderstorms.
.TONIGHT...Southwest winds 5 to 10 knots. Bay waters smooth to a
light chop. Widespread showers and scattered thunderstorms.
.SATURDAY...Southwest to west winds near 10 knots. Bay waters a
light chop. Scattered showers and isolated thunderstorms.
.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...Northeast winds near 15 knots. Bay waters a
moderate chop. Isolated showers.

$$

GMZ032-035-102030-
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-
426 AM EDT Fri Oct 10 2025

.TODAY...Southeast to south winds near 5 knots, becoming south to
southwest. Seas 1 foot or less, except 1 to 2 feet west of the
Marquesas Keys due to a northerly swell. Nearshore waters smooth.
Widespread showers and scattered thunderstorms.
.TONIGHT...Southwest winds 5 to 10 knots, becoming southwest to
west. Seas around 1 foot, except 1 to 2 feet west of the
Marquesas Keys. Nearshore waters smooth to a light chop.
Widespread showers and scattered thunderstorms.
.SATURDAY...West to 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. Scattered showers and isolated
thunderstorms.
.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...Northeast winds 15 to 20 knots. Seas 1 to
2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore
waters choppy. Isolated showers.

$$

GMZ042>044-102030-
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-
426 AM EDT Fri Oct 10 2025

.TODAY...Southeast to south winds near 5 knots, becoming south to
southwest. Seas around 1 foot, except 1 to 2 feet west of
Cosgrove Shoal Light. Nearshore waters smooth. Widespread showers
and scattered thunderstorms.
.TONIGHT...Southwest winds 5 to 10 knots, increasing to near 10
knots after midnight. Seas 1 to 2 feet. Nearshore waters smooth
to a light chop, becoming a light chop. Widespread showers and
scattered thunderstorms.
.SATURDAY...Southwest to west winds 10 to 15 knots, becoming west
to northwest and decreasing to near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop, becoming a light chop.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...West to northwest winds 5 to 10 knots. Seas
1 to 2 feet. 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...Northeast winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Nearshore waters choppy. Isolated
showers.

$$

GMZ052>055-072>075-102030-
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-
426 AM EDT Fri Oct 10 2025

.TODAY...Southeast to south winds 5 to 10 knots, becoming
southwest. Seas 1 to 3 feet due to a northerly swell. Wave
Detail: Southeast 1 foot at 4 seconds. Widespread showers and
scattered thunderstorms.
.TONIGHT...Southwest to west winds 5 to 10 knots, increasing to
10 to 15 knots after midnight. Seas 1 to 3 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. Widespread showers and
scattered thunderstorms.
.SATURDAY...Southwest to west winds 10 to 15 knots, becoming west.
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 isolated thunderstorms.
.SATURDAY NIGHT...West to northwest winds near 10 knots,
decreasing to 5 to 10 knots. Seas 2 to 3 feet. 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 AND TUESDAY NIGHT...Northeast winds 15 to 20 knots. Seas
3 to 5 feet, occasionally to 6 feet. Scattered showers.

$$

GMZ033-034-102030-
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-
426 AM EDT Fri Oct 10 2025

.TODAY...East winds near 10 knots, becoming variable and
decreasing to 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: North
to northeast 2 feet at 5 seconds. Widespread showers and
scattered thunderstorms.
.TONIGHT...Variable winds 5 to 10 knots, becoming northwest to
north after midnight. Seas 1 to 2 feet, building to 2 to 4 feet,
occasionally to 5 feet due to a northerly swell. Wave Detail:
Northwest to north 3 feet at 7 seconds. Numerous showers and
scattered thunderstorms.
.SATURDAY...Northwest to north winds 5 to 10 knots. Seas 2 to
4 feet, occasionally to 5 feet due to a northerly swell. Wave
Detail: Northwest to north 3 feet at 7 seconds. Scattered showers
and isolated thunderstorms.
.SATURDAY NIGHT...Northwest to north winds 5 to 10 knots. Seas
2 to 3 feet. 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, decreasing to 10 to 15
knots. Seas 2 to 3 feet. Isolated showers.
.TUESDAY NIGHT...Northeast winds 10 to 15 knots, becoming northeast
to east and increasing to 15 to 20 knots. Seas 2 to 3 feet.
Isolated showers.

$$

MJV