271
FZUS52 KKEY 081419
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1019 AM EDT Wed Oct 8 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.

GMZ005-090230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1019 AM EDT Wed Oct 8 2025

.SYNOPSIS...An inverted trough will remain in the vicinity of the
Florida Keys marine zones over the next several days, supporting
bouts of elevated rain chances. The proximity of the trough to
the Keys will maintain generally gentle northeast to east breezes
through the end of the work week. 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, and also 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.

$$

GMZ031-090230-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1019 AM EDT Wed Oct 8 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. Bay waters a
light chop. Numerous showers and isolated thunderstorms.
.THURSDAY...Northeast to east winds near 10 knots. Bay waters a
light chop. Numerous showers and isolated thunderstorms.
.THURSDAY NIGHT...Northeast to east winds near 10 knots,
decreasing to 5 to 10 knots. Bay waters a light chop, becoming
smooth to a light chop. Numerous showers and isolated
thunderstorms.
.FRIDAY...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Numerous showers and isolated
thunderstorms.
.FRIDAY NIGHT...North to northeast winds 5 to 10 knots, becoming
northwest to north. Bay waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.SATURDAY...Northwest to north winds near 10 knots. Bay waters a
light chop. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...North winds near 10 knots, increasing to 10 to
15 knots. Bay waters a light chop, becoming a light to moderate
chop. Scattered showers and isolated thunderstorms.
.SUNDAY...North to northeast winds 10 to 15 knots, decreasing to
near 10 knots. Bay waters a light to moderate chop, becoming a
light chop. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...Northeast winds decreasing to 5 to 10 knots. Bay
waters becoming smooth to a light chop. Isolated showers and
thunderstorms.

$$

GMZ032-035-090230-
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-
1019 AM EDT Wed Oct 8 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...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.
.THURSDAY...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.
.THURSDAY NIGHT...Northeast to east winds 10 to 15 knots,
decreasing to near 10 knots. Seas 1 to 2 feet. Nearshore waters a
light to moderate chop, becoming a light chop. Numerous showers
and isolated thunderstorms.
.FRIDAY...Northeast 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. Numerous
showers and isolated thunderstorms.
.FRIDAY NIGHT...North to northeast winds 5 to 10 knots. Seas
around 1 foot, except building to around 2 feet west of the
Marquesas Keys due to a northerly swell. Nearshore waters smooth
to a light chop. Numerous showers and isolated thunderstorms.
.SATURDAY...North winds 5 to 10 knots, increasing to near 10 knots.
Seas 1 to 2 feet, except 2 to 3 feet west of the Marquesas Keys.
Nearshore waters smooth to a light chop, becoming a light chop.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...North to northeast winds near 10 knots,
increasing to 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a
light chop, becoming a light to moderate chop. Scattered showers
and isolated thunderstorms.
.SUNDAY...North to northeast winds 10 to 15 knots, decreasing to
near 10 knots. Seas 1 to 2 feet. Nearshore waters a light to
moderate chop, becoming a light chop. Isolated showers and
thunderstorms.
.SUNDAY NIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Isolated showers and
thunderstorms.

$$

GMZ042>044-090230-
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-
1019 AM EDT Wed Oct 8 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...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.
.THURSDAY...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.
.THURSDAY NIGHT...Northeast to east winds near 10 knots. Seas
1 to 2 feet. Nearshore waters a light chop. Numerous showers and
isolated thunderstorms.
.FRIDAY...Northeast to east winds near 10 knots, decreasing to 5
to 10 knots. Seas around 1 foot, except building to around 2 feet
west of Cosgrove Shoal Light due to a northerly swell. Nearshore
waters a light chop, becoming smooth to a light chop. Numerous
showers and isolated thunderstorms.
.FRIDAY NIGHT...North to northeast winds 5 to 10 knots. Seas
around 1 foot, except around 2 feet west of Cosgrove Shoal Light.
Nearshore waters smooth to a light chop. Numerous showers and
isolated thunderstorms.
.SATURDAY...North winds 5 to 10 knots. Seas around 1 foot, except
building to 2 to 3 feet west of Cosgrove Shoal Light. Nearshore
waters smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SATURDAY NIGHT...North to northeast winds 5 to 10 knots,
increasing to near 10 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 chop. Scattered showers and isolated
thunderstorms.
.SUNDAY...Northeast winds 10 to 15 knots. Seas 1 to 2 feet,
except 2 to 3 feet west of Cosgrove Shoal Light. Nearshore waters
a light to moderate chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet,
except subsiding to around 2 feet west of Cosgrove Shoal Light.
Nearshore waters a light chop. Isolated showers and
thunderstorms.

$$

GMZ052>055-072>075-090230-
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-
1019 AM EDT Wed Oct 8 2025

.THIS AFTERNOON...Northeast to east winds 10 to 15 knots. Seas 2
to 3 feet. Wave Detail: Northeast to east 2 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 around 2 feet. Wave
Detail: Northeast to east 2 feet at 5 seconds. Numerous showers
and isolated thunderstorms.
.THURSDAY...East 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. Numerous showers and
isolated thunderstorms.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2 feet.
Widespread showers and isolated thunderstorms.
.FRIDAY...East winds 5 to 10 knots, becoming variable. Seas 1 to
2 feet. Widespread showers and isolated thunderstorms.
.FRIDAY NIGHT...Variable winds 5 to 10 knots, becoming northwest
to north. Seas 1 to 2 feet, building to 2 to 3 feet due to
northerly swell. Numerous showers and isolated thunderstorms.
.SATURDAY...Northwest to north winds 5 to 10 knots. Seas 2 to
3 feet. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...North winds 5 to 10 knots. Seas 2 to 3 feet.
Scattered showers and isolated thunderstorms.
.SUNDAY...North to northeast winds near 10 knots. Seas 2 to 3
feet. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...Northeast to east winds near 10 knots. Seas 2 to
3 feet. Scattered showers and isolated thunderstorms.

$$

GMZ033-034-090230-
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-
1019 AM EDT Wed Oct 8 2025

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

$$

BT/DP