018
FZUS52 KKEY 050925
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
425 AM EST Fri Dec 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.

GMZ005-052130-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
425 AM EST Fri Dec 5 2025

.SYNOPSIS...A high pressure system over the southwestern North
Atlantic will slide east, while a coastal low pressure takes shape
off the Carolina`s Coast today. This will lead to a weakening
pressure gradient across the area with slackening breezes through
the upcoming weekend. Thereafter, a developing weather system
will move out of the Central Plains and into the Southeast U.S. by
Sunday evening. The attendent cold front will sweep through Monday
night with a brief period of moderate to fresh breezes. Shower
coverage will steadily increase starting Saturday evening and
continuing into early next week.


The Approximate Shoreward Edge of the Gulf Stream as of December 4...

21 NM South of Dry Tortugas Light...on Loggerhead Key.
21 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
22 NM South of Sand Key Light...off Key West.
15 NM South of Looe Key...off Big Pine Key.
 8 NM Southeast of Sombrero Key Light...off Marathon.
 6 NM Southeast of Alligator Reef Light...off Islamorada.
 3 NM Southeast of Molasses Reef Light...off Key Largo.
 1 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.

$$

GMZ031-052130-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
425 AM EST Fri Dec 5 2025

.TODAY...East to southeast winds 5 to 10 knots. Bay waters smooth
to a light chop.
.TONIGHT...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop.
.SATURDAY...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop.
.SATURDAY NIGHT...Southeast winds near 5 knots. Bay waters
smooth. Isolated showers.
.SUNDAY...East to southeast winds 5 to 10 knots, becoming south
in the afternoon. Bay waters smooth to a light chop. Isolated
showers.
.SUNDAY NIGHT...Southwest winds 5 to 10 knots, becoming southwest
to west near 10 knots. Bay waters smooth to a light chop,
becoming a light chop. Scattered showers.
.MONDAY...Southwest to west winds 10 to 15 knots, becoming west to
northwest near 15 knots. Bay waters a light to moderate chop,
becoming a moderate chop. Scattered showers.
.MONDAY NIGHT...West to northwest winds near 15 knots, becoming
north to northeast. Bay waters a moderate chop. Isolated showers.
.TUESDAY...Northeast winds decreasing to 10 to 15 knots. Bay
waters becoming a light to moderate chop. Isolated showers.
.TUESDAY NIGHT...Northeast winds near 10 knots. Bay waters a
light chop. Scattered showers.

$$

GMZ032-035-052130-
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-
425 AM EST Fri Dec 5 2025

.TODAY...East to southeast winds 5 to 10 knots. Seas 1 to 2 feet,
subsiding to 1 foot or less. Nearshore waters smooth to a light
chop.
.TONIGHT...East to southeast winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Isolated showers.
.SUNDAY...Southeast winds 5 to 10 knots, becoming south to
southwest in the afternoon. Seas 1 foot or less. Nearshore waters
smooth to a light chop. Isolated showers.
.SUNDAY NIGHT...Southwest winds 5 to 10 knots, becoming southwest
to west near 10 knots. Seas building to around 1 foot. Nearshore
waters smooth to a light chop, becoming a light chop. Scattered
showers.
.MONDAY...Southwest to west winds 10 to 15 knots, becoming west to
northwest near 15 knots. Seas building to 1 to 2 feet, except
building to 2 to 3 feet west of the Marquesas Keys. Nearshore
waters a light to moderate chop, becoming a moderate chop.
Scattered showers.
.MONDAY NIGHT...Northwest winds near 15 knots, becoming north to
northeast 15 to 20 knots. Seas 2 to 3 feet, except building to 3
to 4 feet, occasionally to 5 feet west of the Marquesas Keys.
Nearshore waters a moderate chop, becoming choppy. Isolated
showers.
.TUESDAY...Northeast winds near 15 knots, decreasing to 10 to 15
knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet. West of the
Marquesas Keys, seas 3 to 4 feet, occasionally to 5 feet,
subsiding to 2 to 3 feet. Nearshore waters a moderate chop,
becoming a light to moderate chop. Isolated showers.
.TUESDAY NIGHT...Northwest to north winds 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.

$$

GMZ042>044-052130-
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-
425 AM EST Fri Dec 5 2025

.TODAY...East to southeast winds near 10 knots, decreasing to 5
to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light
chop.
.TONIGHT...East to southeast winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop.
.SATURDAY...Southeast winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas around
1 foot. Nearshore waters smooth to a light chop. Isolated
showers.
.SUNDAY...Southeast winds 5 to 10 knots, becoming south to
southwest in the afternoon. Seas around 1 foot. Nearshore waters
smooth to a light chop. Isolated showers.
.SUNDAY NIGHT...Southwest winds 5 to 10 knots, becoming southwest
to west near 10 knots. Seas around 1 foot. Nearshore waters
smooth to a light chop, becoming a light chop. Scattered showers.
.MONDAY...Southwest to west winds 10 to 15 knots, becoming west to
northwest near 15 knots. Seas building to 1 to 2 feet, except
building to 2 to 3 feet west of Cosgrove Shoal Light. Nearshore
waters a light to moderate chop, becoming a moderate chop.
Scattered showers.
.MONDAY NIGHT...Northwest winds near 15 knots, becoming north to
northeast 15 to 20 knots. Seas 1 to 2 feet, except 3 to 4 feet,
occasionally to 5 feet west of Cosgrove Shoal Light. Nearshore
waters a moderate chop, becoming choppy. Isolated showers.
.TUESDAY...Northeast winds 15 to 20 knots, decreasing to 10 to 15
knots. Seas 1 to 2 feet, except 2 to 3 feet west of Cosgrove
Shoal Light. Nearshore waters choppy, becoming a light to moderate
chop. Isolated showers.
.TUESDAY NIGHT...North to 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.

$$

GMZ052>055-072>075-052130-
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-
425 AM EST Fri Dec 5 2025

.TODAY...East to southeast winds 10 to 15 knots, decreasing to
near 10 knots. Seas 2 to 3 feet. Wave Detail: East to southeast 3
feet at 5 seconds and northwest 1 foot at 5 seconds. Isolated
showers.
.TONIGHT...East to southeast winds near 10 knots. Seas around 2
feet. Wave Detail: East to southeast 2 feet at 4 seconds. Isolated
showers.
.SATURDAY...Southeast winds near 10 knots. Seas subsiding to 1 to
2 feet. Wave Detail: East to southeast 2 feet at 4 seconds.
.SATURDAY NIGHT...Southeast winds near 10 knots. Seas 1 to 2
feet. Isolated showers.
.SUNDAY...Southeast to south winds near 10 knots, becoming south
to southwest 5 to 10 knots. Seas around 1 foot. Isolated showers.
.SUNDAY NIGHT...Southwest to west winds increasing to near 10
knots. Seas around 1 foot. Scattered showers.
.MONDAY...Southwest to west winds 10 to 15 knots, becoming west to
northwest near 15 knots. Seas 1 to 2 feet, building to 2 to 3 feet.
Scattered showers.
.MONDAY NIGHT...Northwest to north winds near 15 knots, becoming
north to northeast 15 to 20 knots. Seas 2 to 3 feet, building to 3
to 4 feet, occasionally to 5 feet. Scattered showers.
.TUESDAY...Northeast winds 15 to 20 knots, decreasing to 10 to 15
knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered
showers.
.TUESDAY NIGHT...North to northeast winds 10 to 15 knots. Seas
2 to 3 feet. Scattered showers.

$$

GMZ033-034-052130-
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-
425 AM EST Fri Dec 5 2025

.TODAY...East to southeast winds 5 to 10 knots. Seas 1 to 2 feet,
subsiding to around 1 foot. Wave Detail: East to southeast 2 feet
at 3 seconds and west to northwest 1 foot at 5 seconds.
.TONIGHT...East to southeast winds 5 to 10 knots. Seas around
1 foot. Wave Detail: East to southeast 1 foot at 3 seconds.
.SATURDAY...Southeast winds 5 to 10 knots. Seas around 1 foot.
Wave Detail: East to southeast 1 foot at 3 seconds.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas around 1
foot. Isolated showers.
.SUNDAY...East to southeast winds 5 to 10 knots, becoming south to
southwest in the afternoon. Seas around 1 foot. Isolated showers.
.SUNDAY NIGHT...Southwest to west winds 5 to 10 knots, becoming
southwest to west near 10 knots. Seas around 1 foot, building to 1
to 2 feet. Scattered showers.
.MONDAY...Southwest to west winds 10 to 15 knots, becoming
west to northwest near 15 knots. Seas 1 to 2 feet, building to 2
to 3 feet. Scattered showers.
.MONDAY NIGHT...Northwest to north winds 15 to 20 knots, becoming
north to northeast. Seas 3 to 4 feet, occasionally to 5 feet.
Isolated showers.
.TUESDAY...North to northeast winds 15 to 20 knots, decreasing to
10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet.
Isolated showers.
.TUESDAY NIGHT...Northwest to north winds 10 to 15 knots. Seas
2 to 3 feet. Isolated showers.

$$