224
FZUS52 KKEY 050819
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
419 AM EDT Sun Oct 5 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.

GMZ005-052030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
419 AM EDT Sun Oct 5 2025

.SYNOPSIS...A combination of a stationary frontal boundary and a
weak area of low pressure situated near the Bahamas will make for
a messy weather pattern through the next several days. This will
maintain above normal rain chances through the entire forecast
period. In addition, it will keeps winds fluctuating between
northeast and southeast at times. At this time, the strongest
breezes look to stay north of our waters but will bear watching
for updates.


The Approximate Shoreward Edge of the Gulf Stream as of October
01...

42 NM South of Dry Tortugas Light...on Loggerhead Key.
33 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
33 NM South of Sand Key Light...off Key West.
35 NM South of Looe Key...off Big Pine Key.
16 NM Southeast of Sombrero Key Light...off Marathon.
10 NM Southeast of Alligator Reef Light...off Islamorada.
 6 NM Southeast of Molasses Reef Light...off Key Largo.
 5 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.

$$

GMZ031-052030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
419 AM EDT Sun Oct 5 2025

.TODAY...Northeast to east winds near 10 knots early, decreasing
to 5 to 10 knots. Bay waters a light chop, becoming smooth to a
light chop. Scattered showers and isolated thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.MONDAY...Northeast winds 5 to 10 knots. Bay waters smooth to a
light chop. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...Northeast to east winds 5 to 10 knots, becoming
east to southeast near 10 knots. Bay waters smooth to a light
chop, becoming a light chop. Scattered showers and isolated
thunderstorms.
.TUESDAY...East to southeast winds near 10 knots. Bay waters a
light chop. Numerous showers and isolated thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay
waters a light to moderate chop. Scattered showers and isolated
thunderstorms.
.WEDNESDAY...East winds decreasing to near 10 knots. Bay waters
becoming a light chop. Scattered showers and isolated
thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds 10 to 15 knots. Bay
waters a light to moderate chop. Scattered showers and isolated
thunderstorms.
.THURSDAY...East winds increasing to near 15 knots. Bay waters
becoming a moderate chop. Scattered showers and isolated
thunderstorms.
.THURSDAY NIGHT...Northeast to east winds decreasing to 10 to 15
knots. Bay waters becoming a light to moderate chop. Scattered
showers and isolated thunderstorms.

$$

GMZ032-035-052030-
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-
419 AM EDT Sun Oct 5 2025

.TODAY...Northeast to east winds near 10 knots early, decreasing
to 5 to 10 knots. Seas 1 to 2 feet, subsiding to 1 foot or less.
Nearshore waters a light chop, becoming smooth to a light chop.
Scattered showers and isolated thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.MONDAY...Northeast winds 5 to 10 knots, briefly decreasing to
near 5 knots in the afternoon. Seas 1 foot or less. Nearshore
waters becoming smooth to a light chop, becoming smooth.
Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...Northeast winds 5 to 10 knots, becoming east near
10 knots. Seas building to around 1 foot. Nearshore waters smooth
to a light chop, becoming a light chop. Scattered showers and
isolated thunderstorms.
.TUESDAY...East winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. Numerous showers and isolated
thunderstorms.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas building to 1
to 2 feet. Nearshore waters a light to moderate chop. Scattered
showers and isolated thunderstorms.
.WEDNESDAY...East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Scattered showers and
isolated thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
1 to 2 feet, except building to 2 to 3 feet west of the Marquesas
Keys. Nearshore waters a light to moderate chop. Scattered
showers and isolated thunderstorms.
.THURSDAY...East winds increasing to near 15 knots. Seas 1 to 2
feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore
waters a light to moderate chop. Scattered showers and isolated
thunderstorms.
.THURSDAY NIGHT...East winds decreasing to 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. Scattered showers and
isolated thunderstorms.

$$

GMZ042>044-052030-
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-
419 AM EDT Sun Oct 5 2025

.TODAY...Northeast to east winds near 10 knots early, decreasing
to 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a
light chop. Scattered showers and isolated thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots. Seas subsiding
to around 1 foot. Nearshore waters smooth to a light chop.
Scattered showers and isolated thunderstorms.
.MONDAY...Northeast winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...Northeast winds 5 to 10 knots, becoming east to
southeast near 10 knots. Seas around 1 foot. Nearshore waters
smooth to a light chop, becoming a light chop. Scattered showers
and isolated thunderstorms.
.TUESDAY...East winds near 10 knots. Seas building to 1 to 2
feet. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.TUESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas 1
to 3 feet. Nearshore waters a light to moderate chop. Scattered
showers and isolated thunderstorms.
.WEDNESDAY...Northeast to east winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
around 2 feet. Nearshore waters a light to moderate chop.
Scattered showers and isolated thunderstorms.
.THURSDAY...East winds increasing to near 15 knots. Seas building
to 2 to 3 feet. Nearshore waters becoming a moderate chop.
Scattered showers and isolated thunderstorms.
.THURSDAY NIGHT...East winds decreasing to 10 to 15 knots. Seas
around 2 feet. Nearshore waters becoming a light to moderate
chop. Scattered showers and isolated thunderstorms.

$$

GMZ052>055-072>075-052030-
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-
419 AM EDT Sun Oct 5 2025

.TODAY...Northeast to east winds near 10 knots early, decreasing
to 5 to 10 knots. Seas 2 to 4 feet, subsiding to 1 to 3 feet due
to a northerly swell. Wave Detail: Northeast to east 2 feet at 5
seconds. Scattered showers and isolated thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots, becoming east to
southeast. Seas 1 to 3 feet due to a northerly swell, subsiding to
1 to 2 feet. Wave Detail: Northeast 2 feet at 5 seconds.
Scattered showers and isolated thunderstorms.
.MONDAY...East to southeast winds near 5 knots, becoming north to
northeast 5 to 10 knots. Seas 1 to 2 feet. Wave Detail:
Northeast to east 1 foot at 5 seconds. Scattered showers and
isolated thunderstorms.
.MONDAY NIGHT...North to northeast winds 5 to 10 knots, becoming
east to southeast. Seas 1 to 2 feet. Scattered showers and
isolated thunderstorms.
.TUESDAY...East to southeast winds 5 to 10 knots, becoming
northeast to east near 10 knots. Seas building to 1 to 3 feet.
Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas building to 2 to
4 feet. Scattered showers and isolated thunderstorms.
.WEDNESDAY...Northeast to east winds near 10 knots. Seas subsiding
to 2 to 3 feet. Scattered showers and isolated thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas 2
to 3 feet. Scattered showers and isolated thunderstorms.
.THURSDAY...East winds 10 to 15 knots. Seas 2 to 3 feet.
Scattered showers and isolated thunderstorms.
.THURSDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
Scattered showers and isolated thunderstorms.

$$

GMZ033-034-052030-
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-
419 AM EDT Sun Oct 5 2025

.TODAY...East winds near 10 knots, decreasing to 5 to 10 knots.
Seas 1 to 2 feet, subsiding to around 1 foot. Wave Detail: East
to southeast 2 feet at 4 seconds. Scattered showers and isolated
thunderstorms.
.TONIGHT...Northeast to east winds 5 to 10 knots, increasing to
near 10 knots. Seas around 1 foot. Wave Detail: Northeast to east
1 foot at 3 seconds. Scattered showers and isolated
thunderstorms.
.MONDAY...Northeast to east winds 5 to 10 knots, becoming north.
Seas around 1 foot. Wave Detail: Northeast to east 1 foot at 3
seconds. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...North to northeast winds 5 to 10 knots, becoming
east near 10 knots. Seas building to 1 to 2 feet. Scattered
showers and isolated thunderstorms.
.TUESDAY...East winds near 10 knots. Seas 1 to 2 feet. Scattered
showers and isolated thunderstorms.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas around 2 feet.
Scattered showers and isolated thunderstorms.
.WEDNESDAY...Northeast to east winds 10 to 15 knots. Seas around
2 feet. Numerous showers and isolated thunderstorms.
.WEDNESDAY NIGHT...Northeast to east winds increasing to near 15
knots. Seas building to 2 to 3 feet. Scattered showers and
isolated thunderstorms.
.THURSDAY...Northeast to east winds near 15 knots. Seas 2 to 4
feet. Scattered showers and isolated thunderstorms.
.THURSDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet.
Scattered showers and isolated thunderstorms.

$$