HomeForecastsFlorida ForecastsWater Keys, FL - South End, Harbor Channel Coastal Forecast

Water Keys, FL - South End, Harbor Channel Coastal Forecast

FZUS52 KKEY 131424
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1024 AM EDT Sun Apr 13 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.

GMZ005-132100-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1024 AM EDT Sun Apr 13 2025

.SYNOPSIS...Gentle to occasionally moderate northeasterly
breezes will prevail through the afternoon. High pressure will
continue to build in, and cross the southeastern U.S. over the
next few days. Breezes will respond by veering around the clock. A
reinforcing high pressure arriving towards Thursday will lead to
freshening breezes.

The Approximate Shoreward Edge of the Gulf Stream as of April 10...

22 NM South of Dry Tortugas Light...on Loggerhead Key.
5 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
4 NM South of Sand Key Light...off Key West.
10 NM South of Looe Key...off Big Pine Key.
11 NM South of Sombrero Key Light...off Marathon.
7 NM Southeast of Alligator Reef Light...off Islamorada.
2 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 National Weather Service in
Key West based on products from NASA SPoRT.

$$

GMZ031-132100-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1024 AM EDT Sun Apr 13 2025

.THIS AFTERNOON...North to northeast winds 10 to 15 knots early,
becoming northeast to east and briefly decreasing to 5 to 10
knots. Bay waters a light to moderate chop, becoming smooth to a
light chop.
.TONIGHT...East winds increasing to near 10 knots. Bay waters
becoming a light chop.
.MONDAY...East winds 10 to 15 knots. Bay waters a light to
moderate chop.
.MONDAY NIGHT...East winds near 10 knots, becoming east to
southeast and decreasing to 5 to 10 knots. Bay waters a light chop,
becoming smooth to a light chop.
.TUESDAY...Southeast to south winds near 5 knots. Bay waters
smooth.
.TUESDAY NIGHT...South to southwest winds near 5 knots, becoming
west to northwest. Bay waters smooth.
.WEDNESDAY...Northwest to north winds 5 to 10 knots, becoming
west to northwest in the afternoon. Bay waters smooth to a light
chop.
.WEDNESDAY NIGHT...Northwest to north winds 5 to 10 knots,
becoming north to northeast. Bay waters smooth to a light chop.
.THURSDAY...Northeast to east winds 10 to 15 knots. Bay waters a
light to moderate chop.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Bay
waters a moderate chop.

$$

GMZ032-035-132100-
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-
1024 AM EDT Sun Apr 13 2025

.THIS AFTERNOON...North winds 10 to 15 knots early, becoming
north to northeast and briefly decreasing to 5 to 10 knots. Seas
subsiding to 1 to 2 feet. Nearshore waters a moderate chop,
becoming smooth to a light chop.
.TONIGHT...East winds increasing to near 10 knots. Seas 1 to 2
feet, subsiding to around 1 foot. Nearshore waters becoming a
light chop.
.MONDAY...East to southeast winds 10 to 15 knots. Seas around
1 foot. Nearshore waters a light to moderate chop.
.MONDAY NIGHT...East to southeast winds 10 to 15 knots, decreasing
to near 10 knots. Seas around 1 foot. Nearshore waters a light to
moderate chop, becoming a light chop.
.TUESDAY...Northeast to east winds near 10 knots, becoming
northwest to north in the afternoon. Seas around 1 foot.
Nearshore waters a light chop.
.TUESDAY NIGHT...Northwest winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop.
.WEDNESDAY...Northwest winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop.
.WEDNESDAY NIGHT...Northwest to north winds 5 to 10 knots,
becoming northeast and increasing to near 10 knots. Seas 1 foot
or less. Nearshore waters smooth to a light chop, becoming a light
chop.
.THURSDAY...East winds increasing to near 15 knots. Seas building
to 1 to 2 feet. Nearshore waters becoming a moderate chop.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Seas
1 to 2 feet. Nearshore waters a moderate chop.

$$

GMZ042>044-132100-
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-
1024 AM EDT Sun Apr 13 2025

.THIS AFTERNOON...North winds 10 to 15 knots, becoming northeast
5 to 10 knots. Seas 1 to 2 feet, except 2 to 3 feet west of
Cosgrove Shoal Light. Nearshore waters a moderate chop, becoming
smooth to a light chop.
.TONIGHT...East winds increasing to near 10 knots. Seas 1 to 2
feet. Nearshore waters becoming a light chop.
.MONDAY...East winds near 10 knots. Seas 1 to 2 feet. Nearshore
waters a light chop.
.MONDAY NIGHT...East winds near 10 knots, decreasing to 5 to 10
knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming
smooth to a light chop.
.TUESDAY...East winds 5 to 10 knots, becoming variable. Seas 1 to
2 feet. Nearshore waters smooth to a light chop.
.TUESDAY NIGHT...Variable winds near 5 knots, becoming northwest
to north and increasing to 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth, becoming smooth to a light chop.
.WEDNESDAY...Northwest to north winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop.
.WEDNESDAY NIGHT...Northwest to north winds 5 to 10 knots,
becoming north to northeast and increasing to 10 to 15 knots.
Seas around 1 foot, building to 1 to 2 feet. Nearshore waters
smooth to a light chop, becoming a light to moderate chop.
.THURSDAY...Northeast to east winds increasing to near 15 knots.
Seas building to 2 to 3 feet. Nearshore waters becoming a
moderate chop.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Seas
2 to 3 feet. Nearshore waters a moderate chop.

$$

GMZ052>055-072>075-132100-
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-
1024 AM EDT Sun Apr 13 2025

.THIS AFTERNOON...North to northeast winds 10 to 15 knots,
becoming northeast 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
North 3 feet at 6 seconds.
.TONIGHT...East winds near 10 knots, increasing to 10 to 15
knots. Seas building to 2 to 3 feet. Wave Detail: Northeast 3
feet at 5 seconds.
.MONDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 5 seconds.
.MONDAY NIGHT...East winds 10 to 15 knots, decreasing to near 10
knots. Seas 2 to 3 feet, subsiding to 1 to 2 feet.
.TUESDAY...Northeast to east winds near 10 knots. Seas 1 to 2
feet.
.TUESDAY NIGHT...North to northeast winds decreasing to 5 to 10
knots. Seas subsiding to around 1 foot.
.WEDNESDAY...North winds 5 to 10 knots. Seas around 1 foot.
.WEDNESDAY NIGHT...North winds 5 to 10 knots, becoming northeast
and increasing to 10 to 15 knots after midnight. Seas around 1
foot, building to 1 to 2 feet.
.THURSDAY...Northeast to east winds increasing to near 15 knots.
Seas building to 2 to 4 feet, occasionally to 5 feet.
.THURSDAY NIGHT...Northeast to east winds near 15 knots. Seas
3 to 5 feet, occasionally to 6 feet.

$$

GMZ033-034-132100-
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-
1024 AM EDT Sun Apr 13 2025

.THIS AFTERNOON...North to northeast winds near 10 knots,
becoming 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Northwest
to north 3 feet at 6 seconds.
.TONIGHT...North to northeast near 10 knots, becoming east. Seas
around 2 feet. Wave Detail: Northwest 2 feet at 5 seconds.
.MONDAY...East to southeast winds 5 to 10 knots. Seas 1 to 2
feet. Wave Detail: East to southeast 2 feet at 3 seconds and
northwest 1 foot at 5 seconds.
.MONDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to
2 feet.
.TUESDAY...East winds 5 to 10 knots, becoming variable. Seas 1 to
2 feet.
.TUESDAY NIGHT...Variable winds 5 to 10 knots, becoming northwest
to north. Seas around 1 foot.
.WEDNESDAY...North winds 5 to 10 knots, increasing to near 10
knots. Seas around 1 foot, building to 1 to 2 feet.
.WEDNESDAY NIGHT...Northwest to north winds near 10 knots,
becoming north to northeast. Seas 1 to 2 feet.
.THURSDAY...East winds 10 to 15 knots. Seas 2 to 3 feet.
.THURSDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.

$$


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