915
FZUS52 KKEY 171420
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1020 AM EDT Thu Apr 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
1020 AM EDT Thu Apr 17 2025

.SYNOPSIS...High pressure building over the Appalachian mountains
will define conditions over the Florida Keys for the upcoming
weekend. Easterly breezes will freshen to moderate to fresh
tonight with fresh to strong breezes expected Friday. Small Craft
Advisories may be required as early as tonight. Breezes are
forecast to slacken on Monday as the surface high weakens off the
eastern seaboard.

The Approximate Shoreward Edge of the Gulf Stream as of April 16...

30 NM South of Dry Tortugas Light...on Loggerhead Key.
 8 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
 5 NM South of Sand Key Light...off Key West.
 9 NM South of Looe Key...off Big Pine Key.
13 NM South of Sombrero Key Light...off Marathon.
15 NM Southeast of Alligator Reef Light...off Islamorada.
14 NM Southeast of Molasses Reef Light...off Key Largo.
12 NM East 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-
1020 AM EDT Thu Apr 17 2025

.THIS AFTERNOON...Northeast to east winds near 10 knots,
increasing to near 15 knots. Bay waters a light chop, becoming a
moderate chop.
.TONIGHT...Northeast to east winds 15 to 20 knots. Bay waters
choppy.
.FRIDAY AND FRIDAY NIGHT...East winds near 20 knots. Bay waters
rough.
.SATURDAY...East winds 20 to 25 knots. Bay waters very rough.
.SATURDAY NIGHT...East winds near 20 knots. Bay waters rough.
.SUNDAY...East to southeast winds near 20 to 25 knots. Bay waters
very rough.
.SUNDAY NIGHT...East to southeast winds near 20 knots. Bay waters
rough.
.MONDAY...East to southeast winds 15 to 20 knots, decreasing to
near 15 knots. Bay waters choppy, becoming a moderate chop.
Isolated showers.
.MONDAY NIGHT...East to southeast winds near 15 knots. Bay waters
a moderate 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-
1020 AM EDT Thu Apr 17 2025

.THIS AFTERNOON...Northeast to east 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.
.TONIGHT...Northeast to east winds 15 to 20 knots. Seas 1 to 2
feet, building to 2 to 3 feet. Nearshore waters choppy.
.FRIDAY...East winds near 20 knots. Seas 2 to 3 feet, except
around 4 feet, occasionally to 5 feet west of the Marquesas Keys.
Nearshore waters rough.
.FRIDAY NIGHT AND SATURDAY...East winds 20 to 25 knots. Seas 2 to
4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally
to 6 feet west of the Marquesas Keys. Nearshore waters very rough.
.SATURDAY NIGHT...East winds 20 to 25 knots. Seas 2 to 4 feet,
occasionally to 5 feet, except 4 to 6 feet, occasionally to
8 feet west of the Marquesas Keys. Nearshore waters very rough.
.SUNDAY...East to southeast winds 20 to 25 knots. Seas 2 to 3
feet, except 4 to 5 feet, occasionally to 6 feet west of the
Marquesas Keys. Nearshore waters very rough.
.SUNDAY NIGHT...East to southeast winds near 20 knots. Seas 2 to
3 feet, except 4 to 5 feet, occasionally to 6 feet west of the
Marquesas Keys. Nearshore waters rough. Isolated showers.
.MONDAY...East to southeast winds 15 to 20 knots. Seas 2 to
3 feet, except 3 to 4 feet, occasionally to 5 feet west of the
Marquesas Keys. Nearshore waters choppy. Isolated showers.
.MONDAY NIGHT...East to southeast winds 15 to 20 knots. Seas 1 to
2 feet, except 3 to 4 feet, occasionally to 5 feet west of the
Marquesas Keys. Nearshore waters choppy. 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-
1020 AM EDT Thu Apr 17 2025

.THIS AFTERNOON...Northeast to east winds 10 to 15 knots,
increasing to near 15 knots. Seas 1 to 2 feet, building to 2 to 3
feet. Nearshore waters a light to moderate chop, becoming a
moderate chop.
.TONIGHT...Northeast to east winds 15 to 20 knots, increasing to
near 20 knots. Seas 2 to 4 feet, occasionally to 5 feet.
Nearshore waters choppy, becoming rough.
.FRIDAY...East winds near 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Nearshore waters rough.
.FRIDAY NIGHT...East winds 20 to 25 knots. Seas 4 to 6 feet,
occasionally to 8 feet, except 5 to 6 feet, occasionally to
8 feet west of Cosgrove Shoal Light. Nearshore waters very rough.
.SATURDAY...East winds 20 to 25 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Nearshore waters very rough.
.SATURDAY NIGHT...East winds 20 to 25 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Nearshore waters very rough. Isolated
showers.
.SUNDAY...East to southeast winds 20 to 25 knots. Seas 4 to 6
feet, occasionally to 8 feet. Nearshore waters very rough.
.SUNDAY NIGHT...East to southeast winds 20 to 25 knots,
decreasing to near 20 knots. Seas 4 to 6 feet, occasionally to 8
feet. Nearshore waters very rough, becoming rough. Isolated
showers.
.MONDAY...East to southeast winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters choppy. Isolated
showers.
.MONDAY NIGHT...East to southeast winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Nearshore waters choppy. 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-
1020 AM EDT Thu Apr 17 2025

.THIS AFTERNOON...Northeast to east winds 10 to 15 knots,
increasing to near 15 knots. Seas 2 to 4 feet, occasionally to 5
feet, building to 3 to 5 feet, occasionally to 6 feet. Wave
Detail: Northeast to east 3 feet at 4 seconds.
.TONIGHT...Northeast to east winds 15 to 20 knots, increasing to
near 20 knots. Seas 4 to 5 feet, occasionally to 6 feet, building
to 5 to 7 feet, occasionally to 9 feet. Wave Detail:
Northeast to east 5 feet at 5 seconds, becoming northeast to east
7 feet at 7 seconds.
.FRIDAY...East winds near 20 knots. Seas 6 to 8 feet,
occasionally to 10 feet. Wave Detail: Northeast to east 8 feet at
7 seconds.
.FRIDAY NIGHT...East winds 20 to 25 knots. Seas 6 to 9 feet,
occasionally to 11 feet.
.SATURDAY...East winds 20 to 25 knots. Seas 7 to 10 feet,
occasionally to 13 feet. Isolated showers.
.SATURDAY NIGHT...East winds 20 to 25 knots. Seas 7 to 10 feet,
occasionally to 13 feet. Isolated showers.
.SUNDAY AND SUNDAY NIGHT...East to southeast winds 20 to 25
knots. Seas 6 to 9 feet, occasionally to 11 feet. Isolated
showers.
.MONDAY...East to southeast winds near 20 knots, decreasing to 15
to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Isolated
showers.
.MONDAY NIGHT...East to southeast winds 15 to 20 knots. Seas 4 to
6 feet, occasionally to 8 feet. Isolated showers.

$$

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-
1020 AM EDT Thu Apr 17 2025

.THIS AFTERNOON...Northeast to east winds near 10 knots. Seas
around 2 feet. Wave Detail: Northwest to north 2 feet at 5 seconds
and east 1 foot at 3 seconds.
.TONIGHT...East winds 10 to 15 knots, increasing to 15 to 20
knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 4 seconds and
northwest to north 1 foot at 5 seconds.
.FRIDAY...East winds near 20 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds and
northwest to north 1 foot at 5 seconds.
.FRIDAY NIGHT...East winds near 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet.
.SATURDAY...East winds 20 to 25 knots. Seas 4 to 6 feet,
occasionally to 8 feet.
.SATURDAY NIGHT...East winds 20 to 25 knots. Seas 4 to 6 feet,
occasionally to 8 feet.
.SUNDAY...East to southeast winds near 20 knots. Seas 4 to
6 feet, occasionally to 8 feet.
.SUNDAY NIGHT...East to southeast winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Isolated showers.
.MONDAY...East to southeast winds 15 to 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Isolated showers.
.MONDAY NIGHT...East to southeast winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Isolated showers.

$$

DP/AJP