603
FZUS52 KKEY 181423
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1023 AM EDT Fri Apr 18 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.

GMZ005-182030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1023 AM EDT Fri Apr 18 2025

.SYNOPSIS...High pressure building over the Eastern Seaboard will
freshen winds with Small Craft Advisories expected later this
afternoon. Strong easterly breezes are forecast to peak on
Saturday and Saturday night. Breezes will slacken gradually over
the start of the week as the Atlantic high pressure system
weakens.

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.

$$

GMZ031-182030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1023 AM EDT Fri Apr 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.THIS AFTERNOON...Northeast to east winds 15 to 20 knots,
increasing to near 20 knots. Bay waters choppy, becoming rough.
.TONIGHT...Northeast to 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 winds near 20 knots, decreasing to 15 to 20 knots.
Bay waters rough, becoming choppy.
.SUNDAY NIGHT...East winds 15 to 20 knots. Bay waters choppy.
.MONDAY...East to southeast winds 15 to 20 knots. Bay waters
choppy.
.MONDAY NIGHT...East to southeast winds near 15 knots. Bay waters
a moderate chop.
.TUESDAY...East to southeast winds 10 to 15 knots. Bay waters a
light to moderate chop.
.TUESDAY NIGHT...East winds near 15 knots, increasing to 15 to 20
knots. Bay waters a moderate chop, becoming choppy.

$$

GMZ032-035-182030-
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-
1023 AM EDT Fri Apr 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.THIS AFTERNOON...Northeast to east winds 15 to 20 knots,
increasing to near 20 knots. Seas 2 to 3 feet, except 3 to 4 feet,
occasionally to 5 feet west of the Marquesas Keys. Nearshore
waters choppy, becoming rough.
.TONIGHT...Northeast to east 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.
.SATURDAY AND SATURDAY NIGHT...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.
.SUNDAY...East 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.
.SUNDAY NIGHT...East winds near 20 knots, decreasing to 15 to 20
knots. Seas 2 to 3 feet, except 4 to 5 feet, occasionally to 6
feet west of the Marquesas Keys. Nearshore waters rough, becoming
choppy.
.MONDAY AND MONDAY NIGHT...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.
.TUESDAY...East to southeast winds near 15 knots. Seas 1 to 2
feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore
waters a moderate chop.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 1 to 2 feet,
except 2 to 3 feet west of the Marquesas Keys. Nearshore waters
choppy.

$$

GMZ042>044-182030-
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-
1023 AM EDT Fri Apr 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.THIS AFTERNOON...Northeast to east winds 15 to 20 knots,
increasing to near 20 knots. Seas 2 to 4 feet, building to 3 to 5
feet, occasionally to 6 feet. Nearshore waters choppy, becoming
rough.
.TONIGHT...Northeast to east winds near 20 knots. Seas 3 to 5
feet, occasionally to 6 feet. Nearshore waters rough.
.SATURDAY...East winds 20 to 25 knots. Seas building to 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.
.SUNDAY...East winds near 20 knots. Seas subsiding to 3 to 5
feet, occasionally to 6 feet. Nearshore waters rough.
.SUNDAY NIGHT...East winds near 20 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Nearshore waters rough.
.MONDAY...East to southeast winds 15 to 20 knots. Seas subsiding
to 2 to 4 feet, occasionally to 5 feet. Nearshore waters choppy.
.MONDAY NIGHT...East to southeast winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Nearshore waters choppy.
.TUESDAY...East to southeast winds near 15 knots. Seas 2 to 4
feet, occasionally to 5 feet. Nearshore waters a moderate chop.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters choppy.

$$

GMZ052>055-072>075-182030-
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-
1023 AM EDT Fri Apr 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

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

$$

GMZ033-034-182030-
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-
1023 AM EDT Fri Apr 18 2025

...SMALL CRAFT ADVISORY IN EFFECT...

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

$$

AP