507
FZUS52 KKEY 170823
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
423 AM EDT Thu Jul 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
423 AM EDT Thu Jul 17 2025

.SYNOPSIS...A strong area of high pressure will build westward
across the North Atlantic towards the Florida Peninsula,
supporting freshening east to southeast breezes over the next
several days. As a second, weak area of high pressure builds over
the eastern Gulf for the second half of the weekend through early
next week, east to southeast breezes will slacken, becoming light
to gentle.

The Approximate Shoreward Edge of the Gulf Stream as of July 15...

18 NM South of Dry Tortugas Light...on Loggerhead Key.
 3 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
 1 NM South of Sand Key Light...off Key West.
 4 NM South of Looe Key...off Big Pine Key.
 4 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.
 3 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.

$$

GMZ031-172030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
423 AM EDT Thu Jul 17 2025

.TODAY...East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Bay waters a light to moderate chop, becoming a
moderate chop. Scattered showers and isolated thunderstorms.
.TONIGHT...East to southeast winds near 15 knots, increasing to 15
to 20 knots. Bay waters a moderate chop, becoming choppy.
Isolated showers and thunderstorms.
.FRIDAY...East to southeast winds 15 to 20 knots, decreasing to
near 15 knots. Bay waters choppy, becoming a moderate chop.
Isolated showers and thunderstorms.
.FRIDAY NIGHT...East winds near 15 knots. Bay waters a moderate
chop. Isolated showers and thunderstorms.
.SATURDAY...East winds near 15 knots, decreasing to 10 to 15
knots. Bay waters a moderate chop, becoming a light to moderate
chop. Isolated showers and thunderstorms.
.SATURDAY NIGHT...East winds 10 to 15 knots, decreasing to near 10
knots. Bay waters a light to moderate chop, becoming a light chop.
Isolated showers and thunderstorms.
.SUNDAY...East winds near 10 knots. Bay waters a light chop.
Isolated showers and thunderstorms.
.SUNDAY NIGHT...East to southeast winds 5 to 10 knots. Bay waters
smooth to a light chop. Isolated showers and thunderstorms.
.MONDAY AND MONDAY NIGHT...East to southeast winds 5 to 10 knots.
Bay waters smooth to a light chop. Scattered showers and isolated
thunderstorms.

$$

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-
423 AM EDT Thu Jul 17 2025

.TODAY...East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Seas 1 to 2 feet. Nearshore waters a light to
moderate chop, becoming a moderate chop. Scattered showers and
isolated thunderstorms.
.TONIGHT...East to southeast winds near 15 knots, increasing to 15
to 20 knots. Seas 1 to 2 feet, except building to 2 to 3 feet west
of the Marquesas Keys. Nearshore waters a moderate chop, becoming
choppy. Isolated showers and thunderstorms.
.FRIDAY...East to southeast winds 15 to 20 knots, decreasing to
near 15 knots. Seas 1 to 2 feet, except 2 to 3 feet west of the
Marquesas Keys. Nearshore waters choppy, becoming a moderate chop.
Isolated showers and thunderstorms.
.FRIDAY NIGHT...East winds near 15 knots. Seas 1 to 2 feet,
except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a
moderate chop. Isolated showers and thunderstorms.
.SATURDAY...East winds near 15 knots, decreasing to 10 to 15
knots. Seas 1 to 2 feet. West of the Marquesas Keys, seas 2 to 3
feet, subsiding to around 2 feet. Nearshore waters a moderate
chop, becoming a light to moderate chop. Isolated showers and
thunderstorms.
.SATURDAY NIGHT...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. Isolated showers and thunderstorms.
.SUNDAY AND SUNDAY NIGHT...East winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. Isolated showers and
thunderstorms.
.MONDAY AND MONDAY NIGHT...East to southeast winds 5 to 10 knots.
Seas 1 foot or less. Nearshore waters smooth to a light chop.
Scattered showers and isolated thunderstorms.

$$

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-
423 AM EDT Thu Jul 17 2025

.TODAY...East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Seas around 2 feet, building to 2 to 3 feet.
Nearshore waters a light to moderate chop, becoming a moderate
chop. Scattered showers and isolated thunderstorms.
.TONIGHT...East to southeast winds near 15 knots, increasing to 15
to 20 knots. Seas 2 to 3 feet, building to 3 to 4 feet,
occasionally to 5 feet. Nearshore waters a moderate chop, becoming
choppy. Isolated showers and thunderstorms.
.FRIDAY...East to southeast winds 15 to 20 knots, decreasing to
near 15 knots. Seas 3 to 4 feet, occasionally to 5 feet.
Nearshore waters choppy, becoming a moderate chop. Isolated
showers and thunderstorms.
.FRIDAY NIGHT...East winds near 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters a moderate chop.
Scattered showers and isolated thunderstorms.
.SATURDAY...East winds near 15 knots. Seas 2 to 3 feet. Nearshore
waters a moderate chop. Isolated showers and thunderstorms.
.SATURDAY NIGHT...East winds near 15 knots, decreasing to 10 to 15
knots. Seas 2 to 3 feet, subsiding to around 2 feet. Nearshore
waters a moderate chop, becoming a light to moderate chop.
Isolated showers and thunderstorms.
.SUNDAY AND SUNDAY NIGHT...East winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. Isolated showers and
thunderstorms.
.MONDAY...East to southeast winds 5 to 10 knots. Seas 1 to 2
feet, subsiding to around 1 foot. Nearshore waters smooth to a
light chop. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.

$$

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-
423 AM EDT Thu Jul 17 2025

.TODAY...East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 3 feet, building to 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East to southeast 3 feet at
5 seconds. Scattered showers and isolated thunderstorms.
.TONIGHT...East to southeast winds 15 to 20 knots. Seas 3 to
4 feet, occasionally to 5 feet, building to 4 to 5 feet,
occasionally to 6 feet. Wave Detail: East to southeast 5 feet at
6 seconds. Scattered showers and isolated thunderstorms.
.FRIDAY...East to southeast winds 15 to 20 knots, decreasing to
near 15 knots. Seas 4 to 5 feet, occasionally to 6 feet,
subsiding to 3 to 4 feet, occasionally to 5 feet. Wave Detail:
East to southeast 5 feet at 6 seconds. Scattered showers and
isolated thunderstorms.
.FRIDAY NIGHT...East winds near 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Scattered showers and isolated
thunderstorms.
.SATURDAY...East winds near 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Isolated showers and thunderstorms.
.SATURDAY NIGHT...East winds near 15 knots, decreasing 10 to 15
knots. Seas 3 to 4 feet, occasionally to 5 feet, subsiding to 2 to
3 feet. Isolated showers and thunderstorms.
.SUNDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Isolated
showers and thunderstorms.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet,
subsiding to around 2 feet. Isolated showers and thunderstorms.
.MONDAY AND MONDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 2
feet. Scattered showers and isolated 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-
423 AM EDT Thu Jul 17 2025

.TODAY...East to southeast winds 10 to 15 knots. Seas around
2 feet. Wave Detail: East to southeast 2 feet at 4 seconds.
Scattered showers and isolated thunderstorms.
.TONIGHT...East to southeast winds near 15 knots. Seas 2 to
3 feet. Wave Detail: East to southeast 3 feet at 4 seconds.
Scattered showers and isolated thunderstorms.
.FRIDAY...East to southeast winds near 15 knots. Seas 2 to
3 feet. Wave Detail: East to southeast 3 feet at 4 seconds.
Scattered showers and isolated thunderstorms.
.FRIDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet.
Scattered showers and isolated thunderstorms.
.SATURDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 2 to 3 feet, subsiding to around 2 feet.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...East winds 10 to 15 knots, decreasing to near 10
knots. Seas around 2 feet, subsiding to 1 to 2 feet. Isolated
showers and thunderstorms.
.SUNDAY...Northeast to east winds 5 to 10 knots. Seas 1 to 2
feet. Isolated showers and thunderstorms.
.SUNDAY NIGHT THROUGH MONDAY NIGHT...East winds 5 to 10 knots.
Seas around 1 foot. Scattered showers and isolated thunderstorms.


$$

BT