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National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 150830
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
430 AM EDT Thu Apr 15 2021

Florida Bay, Hawk Channel and Straits of Florida from Ocean Reef to
south of Dry Tortugas, and the extreme southeastern Gulf of
Mexico, 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.

GMZ005-151430-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
430 AM EDT Thu Apr 15 2021

SYNOPSIS
The high pressure system located east of Florida will
broaden into a weak ridge axis stretching west across the Bahamas
and the Florida Keys tonight through Sunday. The heating and
cooling of the larger nearby landmasses will result in large peaks
and lulls in the southerly breezes. Breezes will tend to peak
after midnight through mid-morning, while breezes will tend to
lull in the afternoon and evening. A frontal system will stall to
the north of the Keys Sunday night and Monday.

The Approximate Shoreward Edge of the Gulf Stream as of
April 15, 2021...

48 NM South of Dry Tortugas Light...on Loggerhead Key.
27 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
12 NM South of Sand Key Light...off Key West.
11 NM South of Looe Key...off Big Pine Key.
15 NM South of Sombrero Key Light...off Marathon.
11 NM Southeast of Alligator Reef Light...off Islamorada.
 3 NM Southeast of Molasses Reef Light...off Key Largo.
 1 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic
Office.



GMZ031-151430-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
430 AM EDT Thu Apr 15 2021

TODAY
Southeast to south winds near 10 knots, decreasing to 5
to 10 knots in the afternoon. Bay waters a light chop, becoming
smooth to moderate chop.

TONIGHT
South to southwest winds 5 to 10 knots. Bay waters
smooth to a light chop.

FRIDAY
Southwest winds 5 to 10 knots. Bay waters smooth to a
light chop.

FRIDAY NIGHT
Variable winds near 5 knots. Bay waters smooth.

SATURDAY
South to southwest winds near 10 knots. Bay waters a
light chop.

SATURDAY NIGHT
Variable winds near 5 knots. Bay waters smooth.

SUNDAY
South to southwest winds near 10 knots. Bay waters a
light chop. 

SUNDAY NIGHT
Variable winds 5 to 10 knots. Bay waters smooth
to a light chop. Isolated showers.

MONDAY
South to southwest winds near 10 knots. Bay waters a
light chop. Isolated showers.

MONDAY NIGHT
Variable winds 5 to 10 knots. Bay waters smooth
to a light chop. Isolated showers.



GMZ032-035-151430-
Bayside and Gulf side from Craig Key to west end of Seven Mile
Bridge-
Gulf of Mexico from west end of Seven Mile Bridge to Halfmoon
Shoal out to 5 Fathoms-
430 AM EDT Thu Apr 15 2021

TODAY
Southeast winds 10 to 15 knots, becoming southeast to
south and decreasing to near 10 knots in the afternoon. Seas 1 to
2 feet. Nearshore waters a light to moderate chop, becoming a
light chop.

TONIGHT
South winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop.

FRIDAY
South to southwest winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop.

FRIDAY NIGHT
Variable winds near 5 knots, becoming southeast
to south and increasing to near 10 knots. Seas around 1 foot.
Nearshore waters smooth, becoming a light chop.

SATURDAY
South to southwest winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop.

SATURDAY NIGHT
Variable winds 5 to 10 knots, becoming south and
increasing to near 10 knots. Seas around 1 foot. Nearshore waters
smooth to a light chop, becoming a light chop.

SUNDAY
South to southwest winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop.

SUNDAY NIGHT
Variable winds 5 to 10 knots, becoming southeast
to south and increasing to 10 to 15 knots after midnight. Seas 1
foot or less, building to 1 to 2 feet. Nearshore waters smooth to
a light chop, becoming a light to moderate chop. Isolated
showers.

MONDAY
South to southwest winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop. Isolated showers.

MONDAY NIGHT
Variable winds 5 to 10 knots, becoming southeast
to south and increasing to near 10 knots after midnight. Seas around
1 foot. Nearshore waters smooth to a light chop, becoming a light
chop. Scattered showers.



GMZ042>044-151430-
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-
430 AM EDT Thu Apr 15 2021

TODAY
Southeast winds 10 to 15 knots, becoming southeast to
south and decreasing to near 10 knots in the afternoon. Seas 1 to
3 feet, subsiding to 1 to 2 feet. Nearshore waters a light to moderate
chop, becoming a light chop.

TONIGHT
Variable winds 5 to 10 knots, becoming southeast to
south and increasing to near 10 knots. Seas around 1 foot,
building to 1 to 2 feet. Nearshore waters smooth to a light chop,
becoming a light chop.

FRIDAY
South winds near 10 knots, becoming variable 5 to 10
knots. Seas around 1 foot. Nearshore waters a light chop, becoming
smooth to a light chop.

FRIDAY NIGHT
Variable winds 5 to 10 knots, becoming southeast
to south and increasing to near 10 knots. Seas around 1 foot,
building to 1 to 2 feet. Nearshore waters smooth to a light chop,
becoming a light chop.

SATURDAY
South to southwest winds 10 to 15 knots, decreasing to
near 10 knots in the afternoon. Seas 1 to 3 feet, subsiding to 1
to 2 feet. Nearshore waters a light to moderate chop, becoming a
light chop.

SATURDAY NIGHT
Variable winds 5 to 10 knots, becoming south and
increasing to near 10 knots. Seas around 1 foot, building to 1 to
2 feet. Nearshore waters smooth to a light chop, becoming a light
chop.

SUNDAY
Southeast to south winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. 

SUNDAY NIGHT
Variable winds 5 to 10 knots, becoming southeast
to south and increasing to 10 to 15 knots. Seas 1 foot or less,
building to 1 to 3 feet. Nearshore waters smooth to a light chop,
becoming a light to moderate chop. Isolated showers.

MONDAY
South winds 10 to 15 knots, becoming south to southwest
and decreasing to near 10 knots in the afternoon. Seas 1 to 3
feet, subsiding to 1 to 2 feet. Nearshore waters a light to
moderate chop, becoming a light chop. Isolated showers.

MONDAY NIGHT
Variable winds 5 to 10 knots, becoming south and
increasing to near 10 knots. Seas 1 foot or less, building to 1 to
2 feet. Nearshore waters smooth to a light chop, becoming a light
chop. Isolated showers.



GMZ052>055-072>075-151430-
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-
430 AM EDT Thu Apr 15 2021

TODAY
Southeast winds near 15 knots, decreasing to 10 to 15
knots. Seas 3 to 5 feet, subsiding to 2 to 3 feet.

TONIGHT
Southeast to south winds near 10 knots. Seas around 2
feet.

FRIDAY
Southeast to south winds near 10 knots, becoming
variable. Seas 1 to 2 feet.

FRIDAY NIGHT
Variable winds 5 to 10 knots, becoming southeast
to south and increasing to 10 to 15 knots after midnight. Seas 1
to 2 feet, building to 2 to 3 feet.

SATURDAY
South winds 10 to 15 knots, becoming south to
southeast and decreasing to near 10 knots in the afternoon. Seas 2
to 3 feet, subsiding to 1 to 2 feet.

SATURDAY NIGHT
Variable winds 5 to 10 knots, becoming south and
increasing to near 10 knots. Seas 1 to 2 feet.

SUNDAY
Southeast to south winds near 10 knots, becoming
variable 5 to 10 knots in the afternoon. Seas 1 to 2 feet.
Isolated showers in the afternoon.

SUNDAY NIGHT
Variable winds 5 to 10 knots, becoming southeast
to south and increasing to 10 to 15 knots. Seas 1 to 2 feet,
building to 2 to 3 feet. Isolated showers.

MONDAY
South winds 10 to 15 knots, decreasing to near 10 knots.
Seas 2 to 3 feet, subsiding to 1 to 2 feet. Isolated showers.

MONDAY NIGHT
Variable winds 5 to 10 knots, becoming south and
increasing to 10 to 15 knots. Seas 1 to 2 feet, building to 2 to 3
feet. Isolated showers.



GMZ033-034-151430-
Gulf waters from East Cape Sable to Chokoloskee 20 to 60 NM out
and beyond 5 fathoms-
Gulf of Mexico including Dry Tortugas and Rebecca Shoal Channel-
430 AM EDT Thu Apr 15 2021

TODAY
Southeast winds 10 to 15 knots, becoming southeast to
south and decreasing to near 10 knots. Seas 2 to 3 feet,
decreasing to 1 to 3 feet.

TONIGHT
South winds near 10 knots. Seas 1 to 2 feet.

FRIDAY
South to southwest winds near 10 knots, becoming
variable 5 to 10 knots. Seas around 1 foot.

FRIDAY NIGHT
Variable winds 5 to 10 knots, becoming southeast
to south and increasing to 10 to 15 knots. Seas around 1 foot,
building to 2 to 3 feet.

SATURDAY
South to southwest winds 10 to 15 knots, becoming
southwest to west and decreasing to near 10 knots. Seas 2 to 3
feet, subsiding to 1 to 2 feet.

SATURDAY NIGHT
Variable winds 5 to 10 knots, becoming
south and increasing to near 10 knots. Seas 1 to 2 feet.

SUNDAY
South winds near 10 knots. Seas 1 to 2 feet.

SUNDAY NIGHT
Variable winds 5 to 10 knots, becoming southeast
to south and increasing to 10 to 15 knots. Seas around 1 foot,
building to 2 to 3 feet. Scattered showers.

MONDAY
Southwest winds 10 to 15 knots. Seas 2 to 3 feet.
Scattered showers.

MONDAY NIGHT
Variable winds 5 to 10 knots, becoming southeast
to south and increasing to near 10 knots. Seas 1 to 2 feet.
Scattered showers.



SDR