500
FZUS52 KKEY 170817
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
417 AM EDT Sat May 17 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.

GMZ005-172030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
417 AM EDT Sat May 17 2025

.SYNOPSIS...A dry pattern defined by a distant high pressure
system in the central Atlantic and lack of a close high over the
CONUS will lead to breezes shifting from light to moderate breezes
for the next few days. In the absence of nearby strong pressure
systems, breezes will peak and lull through Tuesday. Near nil
shower chances will persist until Wednesday as an increase in
moisture allows for possible showers and isolated thunderstorms.

The Approximate Shoreward Edge of the Gulf Stream as of May
10th...

22 NM South of Dry Tortugas Light...on Loggerhead Key.
 8 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
 6 NM South of Sand Key Light...off Key West.
 5 NM South of Looe Key...off Big Pine Key.
 7 NM South of Sombrero Key Light...off Marathon.
12 NM Southeast of Alligator Reef Light...off Islamorada.
 8 NM Southeast of Molasses Reef Light...off Key Largo.
 2 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic
Office.

$$

GMZ031-172030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
417 AM EDT Sat May 17 2025

.TODAY...Southeast winds near 10 knots, briefly decreasing to 5 to
10 knots in the afternoon. Bay waters a light chop, becoming smooth
to a light chop.
.TONIGHT...East to southeast winds near 10 knots, increasing to 10
to 15 knots. Bay waters a light chop, becoming a light to moderate
chop.
.SUNDAY...Southeast winds near 10 knots. Bay waters a light chop.
.SUNDAY NIGHT...East to southeast winds 10 to 15 knots. Bay
waters a light to moderate chop.
.MONDAY...Southeast winds near 10 knots. Bay waters a light chop.
.MONDAY NIGHT...Southeast winds 10 to 15 knots, increasing to near
15 knots. Bay waters a light to moderate chop, becoming a moderate
chop.
.TUESDAY...Southeast to south winds near 15 knots, decreasing to
near 10 knots. Bay waters a moderate chop, becoming a light chop.
.TUESDAY NIGHT...Southeast winds 10 to 15 knots. Bay waters a
light to moderate chop.
.WEDNESDAY...South winds near 10 knots, becoming south to
southwest 5 to 10 knots. Bay waters a light chop, becoming smooth
to a light chop.
.WEDNESDAY NIGHT...South to southwest winds increasing to near 10
knots. Bay waters becoming a light chop. Isolated showers.

$$

GMZ032-035-172030-
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-
417 AM EDT Sat May 17 2025

.TODAY...Southeast winds near 10 knots, briefly decreasing to 5
to 10 knots in the afternoon. Seas 1 to 2 feet, subsiding to 1
foot or less. Nearshore waters a light chop, becoming smooth to a
light chop.
.TONIGHT...East to southeast winds near 10 knots, increasing to 10
to 15 knots. Seas building to 1 to 2 feet. Nearshore waters a
light chop, becoming a light to moderate chop.
.SUNDAY...Southeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop.
.SUNDAY NIGHT...East to southeast 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.
.MONDAY...Southeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop.
.MONDAY NIGHT...East to southeast winds 10 to 15 knots, 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,
becoming a moderate chop.
.TUESDAY...Southeast to south winds 10 to 15 knots, decreasing to
near 10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. West
of the Marquesas Keys, seas 2 to 3 feet, subsiding to 1 to 2 feet.
Nearshore waters a light to moderate chop, becoming a light chop.
.TUESDAY NIGHT...East to southeast winds near 10 knots,
becoming southeast to south 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light chop, becoming a light to moderate chop.
.WEDNESDAY...Southeast to south winds near 10 knots, becoming
south to southwest 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.
.WEDNESDAY NIGHT...West to northwest winds 5 to 10 knots,
becoming south to southwest. Seas 1 foot or less. Nearshore
waters smooth to a light chop. Isolated showers.

$$

GMZ042>044-172030-
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-
417 AM EDT Sat May 17 2025

.TODAY...Southeast to south winds near 10 knots, becoming east to
southeast and briefly decreasing to 5 to 10 knots in the afternoon.
Seas 1 to 3 feet, subsiding to 1 to 2 feet. Nearshore waters a
light chop, becoming smooth to a light chop.
.TONIGHT...East to southeast winds near 10 knots, increasing to 10
to 15 knots. Seas 1 to 2 feet, building to 2 to 3 feet. Nearshore
waters a light chop, becoming a light to moderate chop.
.SUNDAY...Southeast winds near 10 knots. Seas subsiding to 1 to 2
feet. Nearshore waters a light chop.
.SUNDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
building to 2 to 3 feet. Nearshore waters a light to moderate
chop.
.MONDAY...Southeast winds 10 to 15 knots. Seas 2 to 3 feet.
Nearshore waters a light to moderate chop.
.MONDAY NIGHT...East to southeast winds 10 to 15 knots, increasing
to near 15 knots. Seas 2 to 3 feet. Nearshore waters a light to
moderate chop, becoming a moderate chop.
.TUESDAY...Southeast winds 10 to 15 knots, decreasing to near 10
knots. Seas subsiding to around 2 feet. Nearshore waters a light
to moderate chop, becoming a light chop.
.TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas around 2
feet. Nearshore waters a light to moderate chop.
.WEDNESDAY...South winds near 10 knots, becoming south to
southwest 5 to 10 knots. Seas subsiding to 1 to 2 feet. Nearshore
waters a light chop, becoming smooth to a light chop.
.WEDNESDAY NIGHT...Variable winds 5 to 10 knots, becoming south
to southwest near 10 knots. Seas around 1 foot. Nearshore waters
smooth to a light chop, becoming a light chop. Isolated showers.

$$

GMZ052>055-072>075-172030-
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-
417 AM EDT Sat May 17 2025

.TODAY...Southeast winds 10 to 15 knots, becoming east to
southeast and briefly decreasing to near 10 knots. Seas 2 to 3
feet. Wave Detail: East to southeast 3 feet at 5 seconds.
.TONIGHT...East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: East to southeast 4 feet at 5 seconds.
.SUNDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Wave Detail: East to southeast 3 feet at 5 seconds.
.SUNDAY NIGHT...East to southeast winds increasing to near 15
knots. Seas 2 to 4 feet, occasionally to 5 feet.
.MONDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet.
.MONDAY NIGHT...East to southeast winds increasing to near 15
knots. Seas 2 to 4 feet, occasionally to 5 feet.
.TUESDAY...Southeast winds 10 to 15 knots. Seas 2 to 3 feet.
.TUESDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
around 2 feet.
.WEDNESDAY...Southeast to south winds near 10 knots, becoming
variable 5 to 10 knots. Seas subsiding to 1 to 2 feet.
.WEDNESDAY NIGHT...Variable winds 5 to 10 knots, becoming south
near 10 knots. Seas around 1 foot. Isolated showers and
thunderstorms.

$$

GMZ033-034-172030-
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-
417 AM EDT Sat May 17 2025

.TODAY...Southeast winds near 10 knots, becoming east 5 to 10
knots. Seas 1 to 2 feet. Wave Detail: Southeast 2 feet at 3
seconds.
.TONIGHT...East winds 5 to 10 knots early, becoming southeast 10
to 15 knots. Seas 1 to 2 feet. Wave Detail: Southeast 2 feet at 3
seconds.
.SUNDAY...Southeast winds near 10 knots. Seas 1 to 2 feet. Wave
Detail: Southeast 2 feet at 3 seconds.
.SUNDAY NIGHT...East to southeast winds near 10 knots, increasing
to 10 to 15 knots. Seas 1 to 2 feet.
.MONDAY...Southeast winds near 10 knots. Seas 1 to 2 feet.
.MONDAY NIGHT...East to southeast winds near 10 knots, becoming
southeast 10 to 15 knot. Seas building to 1 to 3 feet.
.TUESDAY...Southeast to south winds 10 to 15 knots, decreasing to
near 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 10 knots, increasing to near
10 knots. Seas 1 to 2 feet.
.WEDNESDAY...Southeast to south winds near 10 knots, becoming
southwest to west 5 to 10 knots. Seas 1 to 2 feet.
.WEDNESDAY NIGHT...West to northwest winds 5 to 10 knots,
becoming south to southwest. Seas around 1 foot. Isolated
showers.

$$