176
FZUS52 KKEY 091413
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1013 AM EDT Thu Oct 9 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.

GMZ005-100215-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1013 AM EDT Thu Oct 9 2025

.SYNOPSIS...An inverted trough will remain in the vicinity of the
Florida Keys marine zones over the next couple of days,
supporting bouts of elevated rain chances. The proximity of the
trough to the Keys will also maintain generally gentle northeast
to east breezes. A developing area of low pressure off the coast
of the Carolinas will drive an early season cold front towards the
Keys over the weekend, backing winds to the north to northeast.
Northerly swells will be possible in our eastern marine zones late
in the weekend into early next week 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.

$$

GMZ031-100215-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1013 AM EDT Thu Oct 9 2025

.THIS AFTERNOON...Northeast to east winds near 10 knots. Bay
waters a light chop. Numerous showers and isolated thunderstorms.
.TONIGHT...Northeast to east winds near 10 knots, decreasing to 5
to 10 knots. Bay waters a light chop, becoming smooth to a light
chop. Widespread showers and isolated thunderstorms.
.FRIDAY...East to southeast winds near 5 knots, becoming variable.
Bay waters smooth. Widespread showers and isolated thunderstorms.
.FRIDAY NIGHT...Variable winds near 5 knots. Bay waters smooth.
Numerous showers and isolated thunderstorms.
.SATURDAY...Variable winds near 5 knots, becoming northwest. Bay
waters smooth. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...Northwest to north winds increasing to 5 to 10
knots. Bay waters becoming smooth to a light chop. Isolated
showers and thunderstorms.
.SUNDAY...North winds 5 to 10 knots. Bay waters smooth to a light
chop. Isolated showers.
.SUNDAY NIGHT...Northeast winds 5 to 10 knots. Bay waters smooth
to a light chop. 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. Bay waters
a light chop. Isolated showers.

$$

GMZ032-035-100215-
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-
1013 AM EDT Thu Oct 9 2025

.THIS AFTERNOON...Northeast to east winds 10 to 15 knots. Seas 1
to 2 feet. Nearshore waters a light to moderate chop. Numerous
showers and isolated thunderstorms.
.TONIGHT...East winds near 10 knots, decreasing to 5 to 10 knots.
Seas 1 to 2 feet, subsiding to around 1 foot. Nearshore waters a
light chop, becoming smooth to a light chop. Widespread showers
and isolated thunderstorms.
.FRIDAY...East to southeast winds 5 to 10 knots, becoming
northeast to east and decreasing to near 5 knots. Seas around 1
foot, except building to 1 to 2 feet west of the Marquesas Keys
due to a northerly swell. Nearshore waters smooth to a light
chop, becoming smooth. Widespread showers and isolated
thunderstorms.
.FRIDAY NIGHT...North to northeast winds near 5 knots, becoming
northwest to north. Seas around 1 foot, except around 2 feet west
of the Marquesas Keys. Nearshore waters smooth. Numerous showers
and isolated thunderstorms.
.SATURDAY...Northwest to north winds 5 to 10 knots, increasing to
near 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a
light chop, becoming a light chop. Scattered showers and isolated
thunderstorms.
.SATURDAY NIGHT...North winds near 10 knots, decreasing to 5 to 10
knots. Seas 1 to 2 feet, subsiding to around 1 foot. Nearshore
waters a light chop, becoming smooth to a light chop. Isolated
showers and thunderstorms.
.SUNDAY AND SUNDAY NIGHT...North winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Isolated
showers.
.MONDAY AND MONDAY NIGHT...Northeast to east winds 5 to 10 knots.
Seas around 1 foot. Nearshore waters smooth to a light chop.
Isolated showers.

$$

GMZ042>044-100215-
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-
1013 AM EDT Thu Oct 9 2025

.THIS AFTERNOON...Northeast to east winds 10 to 15 knots. Seas 1
to 2 feet. Nearshore waters a light to moderate chop. Numerous
showers and isolated thunderstorms.
.TONIGHT...East winds near 10 knots, becoming east to southeast
and decreasing to 5 to 10 knots late. Seas 1 to 2 feet, subsiding
to around 1 foot. Nearshore waters a light chop, becoming smooth
to a light chop. Widespread showers and isolated thunderstorms.
.FRIDAY...East to southeast winds near 5 knots, becoming variable.
Seas around 1 foot. Nearshore waters smooth. Widespread showers
and isolated thunderstorms.
.FRIDAY NIGHT...Variable winds near 5 knots, becoming southeast
after midnight. Seas around 1 foot. Nearshore waters smooth.
Numerous showers and isolated thunderstorms.
.SATURDAY...Variable winds increasing to 5 to 10 knots, becoming
northwest to north. Seas around 1 foot, except building to 2 to 3
feet west of Cosgrove Shoal Light due to a northerly swell.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.SATURDAY NIGHT...Northwest to north winds 5 to 10 knots. Seas
1 to 2 feet. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.SUNDAY...North to northeast winds 5 to 10 knots. Seas 1 to 2
feet. Nearshore waters smooth to a light chop. Isolated showers.
.SUNDAY NIGHT THROUGH MONDAY NIGHT...Northeast to east winds near
10 knots. Seas 1 to 2 feet. Nearshore waters a light chop.
Isolated showers.

$$

GMZ052>055-072>075-100215-
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-
1013 AM EDT Thu Oct 9 2025

.THIS AFTERNOON...East winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Northeast to east 2 feet at 4 seconds. Numerous
showers and isolated thunderstorms.
.TONIGHT...East to southeast winds near 10 knots, decreasing to 5
to 10 knots. Seas around 2 feet, subsiding to 1 to 2 feet. Wave
Detail: Northeast to east 2 feet at 4 seconds. Widespread showers
and isolated thunderstorms.
.FRIDAY...Southeast to south winds 5 to 10 knots. Seas 1 to
2 feet. Wave Detail: Northeast to east 2 feet at 4 seconds.
Widespread showers and isolated thunderstorms.
.FRIDAY NIGHT...South to southwest winds 5 to 10 knots. Seas
building to 2 to 3 feet due to northerly swell. Numerous showers
and isolated thunderstorms.
.SATURDAY...West to northwest winds 5 to 10 knots. Seas 2 to
3 feet. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...Northwest to north winds 5 to 10 knots. Seas
2 to 3 feet. Scattered showers and isolated thunderstorms.
.SUNDAY...North to northeast winds 5 to 10 knots. Seas 2 to
3 feet. Isolated showers.
.SUNDAY NIGHT THROUGH MONDAY NIGHT...Northeast to east winds near
10 knots. Seas 2 to 3 feet. Isolated showers.

$$

GMZ033-034-100215-
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-
1013 AM EDT Thu Oct 9 2025

.THIS AFTERNOON...Northeast to east winds 10 to 15 knots. Seas 2
to 3 feet. Wave Detail: Northeast 3 feet at 5 seconds. Numerous
showers and isolated thunderstorms.
.TONIGHT...Northeast to east winds 10 to 15 knots, decreasing to
near 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. Wave
Detail: Northeast to east 2 feet at 4 seconds. Numerous showers
and isolated thunderstorms.
.FRIDAY...Northeast to east winds near 10 knots, decreasing to 5
to 10 knots. Seas building to 2 to 3 feet due to a northerly swell.
Wave Detail: Northeast 3 feet at 5 seconds. Numerous showers and
isolated thunderstorms.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots. Seas 2 to 3 feet.
Numerous showers and isolated thunderstorms.
.SATURDAY...North to northeast winds near 10 knots. Seas building
to 2 to 4 feet, occasionally to 5 feet due to a northerly swell.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...North winds near 10 knots. Seas 2 to 3 feet.
Isolated showers and thunderstorms.
.SUNDAY...North to northeast winds 5 to 10 knots. Seas 2 to
3 feet. Isolated showers.
.SUNDAY NIGHT...Northeast to east winds near 10 knots. Seas 1 to
2 feet. Isolated showers.

$$

BT/DP