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National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 120817
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
417 AM EDT Wed May 12 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.

GMZ005-121430-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
417 AM EDT Wed May 12 2021

SYNOPSIS
High pressure over the western Atlantic will retreat
further offshore today through Thursday, as a weak low pressure
trough eases southward across the Florida peninsula. Light to
gentle breezes will prevail across the Keys coastal waters from
this afternoon through Friday. High pressure building from the
eastern United States into the western Atlantic will bring
freshening easterly breezes for the weekend.

The Approximate Shoreward Edge of the Gulf Stream as of May 11...

25 NM South of Dry Tortugas Light...on Loggerhead Key.
26 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
26 NM South of Sand Key Light...off Key West.
28 NM South of Looe Key...off Big Pine Key.
13 NM South of Sombrero Key Light...off Marathon.
 7 NM Southeast of Alligator Reef Light...off Islamorada.
 7 NM Southeast of Molasses Reef Light...off Key Largo.
 6 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic
Office.



GMZ031-121430-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
417 AM EDT Wed May 12 2021

TODAY
Southeast winds near 10 knots early, becoming southeast
to south and decreasing to 5 to 10 knots. Bay waters a light chop,
becoming smooth to a light chop. Isolated showers.

TONIGHT
East to southeast winds near 5 knots. Bay waters
smooth. Isolated showers.

THURSDAY
East winds near 5 knots, becoming southeast to south 5
to 10 knots in the afternoon. Bay waters smooth, becoming smooth
to a light chop. Isolated showers in the morning, then scattered
showers and isolated thunderstorms in the afternoon.

THURSDAY NIGHT
West to northwest winds 5 to 10 knots, becoming
northeast to east after midnight. Bay waters smooth to a light
chop. Scattered showers and thunderstorms in the evening, then
isolated showers after midnight.

FRIDAY
Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.

FRIDAY NIGHT
Northeast winds increasing to 10 to 15 knots. Bay
waters becoming a light to moderate chop. Scattered showers and
isolated thunderstorms.

SATURDAY
Northeast to east winds near 15 knots. Bay waters a
moderate chop. Scattered showers and isolated thunderstorms.

SATURDAY NIGHT
Northeast to east winds 15 to 20 knots. Bay
waters choppy. Scattered showers.

SUNDAY
Northeast to east winds near 20 knots. Bay waters
rough. Isolated showers.

SUNDAY NIGHT
Northeast to east winds near 20 knots. Bay waters
rough. Scattered showers.



GMZ032-035-121430-
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-
417 AM EDT Wed May 12 2021

TODAY
Southeast winds near 10 knots early, becoming southeast
to south and decreasing to 5 to 10 knots. Seas 1 foot or less.
Nearshore waters a light chop, becoming smooth to a light chop.
Isolated showers.

TONIGHT
Variable winds near 5 knots, becoming east after
midnight. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers.

THURSDAY
Northeast to east winds near 5 knots, becoming
variable in the afternoon. Seas 1 foot or less. Nearshore waters
smooth. Isolated showers in the morning, then isolated showers
and thunderstorms in the afternoon.

THURSDAY NIGHT
Northwest to north winds near 10 knots, becoming
northeast to east and decreasing to 5 to 10 knots after midnight.
Seas around 1 foot. Nearshore waters a light chop, becoming smooth
to a light chop. Isolated showers.

FRIDAY
Northeast winds 5 to 10 knots. Seas 1 to 2 feet.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.

FRIDAY NIGHT
Northeast winds increasing to 10 to 15 knots.
Seas 1 to 2 feet. Nearshore waters becoming a light to moderate
chop. Scattered showers and isolated thunderstorms.

SATURDAY
Northeast to east winds near 15 knots. Seas 1 to 3
feet. Nearshore waters a moderate chop. Isolated showers and
thunderstorms.

SATURDAY NIGHT
Northeast to east winds increasing to near 20 
knots. Seas 1 to 3 feet, except 3 to 4 feet west of the Marquesas
Keys. Nearshore waters becoming rough. Scattered showers.

SUNDAY AND SUNDAY NIGHT
Northeast to east winds near 20 knots.
Seas 2 to 4 feet, except 4 to 5 feet west of the Marquesas Keys.
Nearshore waters rough. Isolated showers.



GMZ042>044-121430-
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-
417 AM EDT Wed May 12 2021

TODAY
Southeast winds 10 to 15 knots early, decreasing to 5 to
10 knots. Seas 1 to 2 feet, subsiding to around 1 foot. Nearshore
waters a light to moderate chop, becoming smooth to a light chop.
Isolated showers.

TONIGHT
Mainly east winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Isolated showers, except
scattered showers east of Alligator Reef Light in the evening.

THURSDAY
Northeast to east winds near 5 knots, becoming
variable in the afternoon. Seas around 1 foot. Nearshore waters
smooth. Isolated showers in the morning, then isolated showers and
thunderstorms in the afternoon.

THURSDAY NIGHT
West to northwest winds 5 to 10 knots, becoming
northeast to east after midnight. Seas 1 to 2 feet. Nearshore
waters smooth to a light chop. Isolated showers, except scattered
showers and isolated thunderstorms east of Alligator Reef Light in
the evening.

FRIDAY
Northeast to east winds 5 to 10 knots. Seas 1 to 2
feet. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.

FRIDAY NIGHT
Northeast winds increasing to 10 to 15 knots.
Seas 1 to 2 feet. Nearshore waters becoming a light to moderate
chop. Scattered showers and isolated thunderstorms.

SATURDAY
Northeast to east winds near 15 knots. Seas 1 to
3 feet. Nearshore waters a moderate chop. Scattered showers and
isolated thunderstorms.

SATURDAY NIGHT
Northeast to east winds increasing to near 20
knots. Seas building to 2 to 4 feet. Nearshore waters becoming
rough. Scattered showers.

SUNDAY AND SUNDAY NIGHT
Northeast to east winds near 20 knots.
Seas 3 to 5 feet. Nearshore waters rough. Scattered showers.



GMZ052>055-072>075-121430-
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-
417 AM EDT Wed May 12 2021

TODAY
Southeast winds 10 to 15 knots early, becoming east to
southeast and decreasing to 5 to 10 knots. Seas 2 to 4 feet,
subsiding to 1 to 2 feet. Isolated showers.

TONIGHT
Mainly east winds 5 to 10 knots. Seas 1 to 2 feet.
Isolated showers.

THURSDAY
Northeast to east winds 5 to 10 knots, becoming
variable in the afternoon. Seas 1 to 2 feet. Isolated showers in
the morning, then isolated showers and thunderstorms in the
afternoon.

THURSDAY NIGHT
Northwest to north winds 5 to 10 knots, becoming
northeast to east after midnight. Seas 1 to 2 feet. Isolated
showers.

FRIDAY
Northeast to east winds 5 to 10 knots. Seas 1 to 3
feet. Scattered showers and isolated thunderstorms.

FRIDAY NIGHT
Northeast winds increasing to 10 to 15 knots.
Seas building to 2 to 4 feet. Scattered showers and isolated
thunderstorms.

SATURDAY
Northeast to east winds near 15 knots. Seas 3 to 5
feet. Scattered showers and isolated thunderstorms.

SATURDAY NIGHT
Northeast to east winds increasing to near 20
knots. Seas building to 4 to 7 feet. Scattered showers.

SUNDAY AND SUNDAY NIGHT
Northeast to east winds near 20 knots.
Seas 5 to 7 feet. Scattered showers.



GMZ033-034-121430-
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-
417 AM EDT Wed May 12 2021

TODAY
Southeast winds near 10 knots early, becoming southeast
to south and decreasing to near 5 knots. Seas 1 to 2 feet.
Isolated showers.

TONIGHT
North winds 5 to 10 knots, becoming northeast after
midnight. Seas 1 foot or less. Isolated showers.

THURSDAY
Northeast winds 5 to 10 knots, becoming variable near
5 knots in the afternoon. Seas 1 foot or less. Isolated showers.

THURSDAY NIGHT
Northwest to north winds near 15 knots,
becoming northeast and decreasing to 10 to 15 knots after midnight.
Seas building to 2 to 3 feet. Isolated showers.

FRIDAY
Northeast winds near 10 knots, becoming north to
northeast and decreasing to 5 to 10 knots. Seas 1 to 3 feet.
Isolated showers and thunderstorms.

FRIDAY NIGHT
Northeast winds increasing to 10 to 15 knots.
Seas 1 to 3 feet. Isolated showers and thunderstorms.

SATURDAY
Northeast winds near 15 knots. Seas 2 to 4 feet.
Isolated showers and thunderstorms.

SATURDAY NIGHT
Northeast to east winds increasing to near 20
knots. Seas 2 to 4 feet. Isolated showers.

SUNDAY AND SUNDAY NIGHT
East winds near 20 knots. Seas 3 to 5
feet. Isolated showers.