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National Weather Service Marine Forecast FZUS52 KKEY

FZUS52 KKEY 160325
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1025 PM EST Sun Dec 15 2019

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.

GMZ005-160930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1025 PM EST Sun Dec 15 2019

SYNOPSIS
High pressure will strengthen and slide further
offshore over the western North Atlantic overnight through Monday
night. A cold front will move southeastward across the Gulf of
Mexico Monday night through Tuesday night, before pushing through
the Florida Keys Wednesday. Strong north to northeast breezes are
expected behind the front from Wednesday afternoon through
Thursday night. Fresh to strong breezes will turn more to the
northeast to east Friday and Friday night.

The Approximate Shoreward Edge of the Gulf Stream as of
December 14...

50 NM South of Dry Tortugas Light...on Loggerhead Key.
25 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
15 NM South of Sand Key Light...off Key West.
 8 NM South of Looe Key...off Big Pine Key.
 4 NM South of Sombrero Key Light...off Marathon.
 1 NM Southeast of Alligator Reef Light...off Islamorada.
 1 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.



GMZ031-160930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1025 PM EST Sun Dec 15 2019

OVERNIGHT
Northeast to east winds near 15 knots. Bay waters a
moderate chop.

MONDAY
Northeast to east winds near 15 knots. Bay waters a
moderate chop. Isolated showers.

MONDAY NIGHT
East winds 10 to 15 knots. Bay waters a light to
moderate chop. Isolated showers in the evening, then scattered
showers after midnight.

TUESDAY
Southeast winds 10 to 15 knots. Bay waters a light to
moderate chop. Scattered showers in the morning, then isolated
showers in the afternoon.

TUESDAY NIGHT
Southeast to south winds near 10 knots, becoming
variable and decreasing to 5 to 10 knots. Bay waters a light chop,
becoming smooth to a light chop. Scattered showers.

WEDNESDAY
West to northwest winds 5 to 10 knots, becoming
northwest to north and increasing to near 15 knots in the
afternoon. Bay waters smooth to a light chop, becoming a moderate
chop. Scattered showers.

WEDNESDAY NIGHT
North winds 20 to 25 knots. Bay waters very
rough. Isolated showers.

THURSDAY AND THURSDAY NIGHT
Northeast winds 20 to 25 knots.
Bay waters very rough. Isolated showers.

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

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



GMZ032-035-160930-
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-
1025 PM EST Sun Dec 15 2019

OVERNIGHT
Northeast to east winds near 15 knots. Seas 1 to
3 feet. Nearshore waters a moderate chop.

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

MONDAY NIGHT
East winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Isolated showers in
the evening, then scattered showers after midnight.

TUESDAY
Southeast winds 10 to 15 knots. Seas 1 to 2 feet.
Nearshore waters a light to moderate chop. Scattered showers in
the morning, then isolated showers in the afternoon.

TUESDAY NIGHT
Southeast to south winds near 10 knots, becoming
variable and decreasing to near 5 knots. Seas 1 foot or less.
Nearshore waters a light chop, becoming smooth. Scattered
showers.

WEDNESDAY
West to northwest winds 5 to 10 knots, becoming
northwest to north and increasing to near 20 knots in the
afternoon. Seas 1 foot or less, building to 3 to 4 feet in the
afternoon. West of the Marquesas Keys, seas 1 to 3 feet building
to 4 to 6 feet in the afternoon. Nearshore waters smooth to a
light chop, becoming rough. Scattered showers.

WEDNESDAY NIGHT
North to northeast winds 20 to 25 knots. Seas
3 to 5 feet, except 5 to 8 feet west of the Marquesas Keys.
Nearshore waters very rough. Isolated showers.

THURSDAY AND THURSDAY NIGHT
Northeast winds 20 to 25 knots.
Seas 2 to 4 feet, except 4 to 7 feet west of the Marquesas Keys.
Nearshore waters very rough. Isolated showers.

FRIDAY
Northeast to east winds 20 to 25 knots. Seas 2 to 4
feet. Nearshore waters very rough. Isolated showers.

FRIDAY NIGHT
Northeast to east winds 15 to 20 knots. Seas 2 to
3 feet. Nearshore waters choppy. Scattered showers.



GMZ042>044-160930-
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-
1025 PM EST Sun Dec 15 2019

SMALL CRAFT SHOULD EXERCISE CAUTION


OVERNIGHT
East winds 15 to 20 knots. Seas building to 2 to 4
feet. Nearshore waters choppy.

MONDAY
East winds 15 to 20 knots. Seas 2 to 4 feet. Nearshore
waters choppy. Isolated showers.

MONDAY NIGHT
East to southeast winds near 15 knots. Seas 2 to
3 feet. Nearshore waters a moderate chop. Isolated showers in the
evening, then scattered showers after midnight.

TUESDAY
Southeast winds 10 to 15 knots. Seas 1 to 3 feet.
Nearshore waters a light to moderate chop. Scattered showers in
the morning, then isolated showers in the afternoon.

TUESDAY NIGHT
Southeast to south winds near 10 knots, becoming
variable and decreasing to 5 to 10 knots. Seas 1 to 2 feet,
subsiding to around 1 foot. Nearshore waters a light chop,
becoming smooth to a light chop. Scattered showers.

WEDNESDAY
West to northwest winds 5 to 10 knots, becoming northwest
to north and increasing to near 20 knots in the afternoon. Seas
around 1 foot, building to 2 to 3 feet. West of Cosgrove Shoal
Light, seas 1 to 2 feet building to 4 to 5 feet in the afternoon.
Nearshore waters smooth to a light chop, becoming rough. Scattered
showers.

WEDNESDAY NIGHT
North to northeast winds 20 to 25 knots. Seas
3 to 4 feet, except 5 to 7 feet west of Cosgrove Shoal Light.
Nearshore waters very rough. Isolated showers.

THURSDAY
Northeast winds 20 to 25 knots. Seas 3 to 5 feet,
except 4 to 6 feet west of Cosgrove Shoal Light. Nearshore waters
very rough. Isolated showers.

THURSDAY NIGHT
Northeast to east winds 20 to 25 knots. Seas
3 to 5 feet. Nearshore waters very rough. Isolated showers.

FRIDAY
Northeast to east winds 20 to 25 knots. Seas 3 to 5
feet. Nearshore waters very rough. Scattered showers.

FRIDAY NIGHT
Northeast to east winds near 20 knots. Seas 2 to
4 feet. Nearshore waters rough. Scattered showers.



GMZ052>055-072>075-160930-
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-
1025 PM EST Sun Dec 15 2019

SMALL CRAFT SHOULD EXERCISE CAUTION


OVERNIGHT
East winds 15 to 20 knots. Seas building to 4 to 5
feet. Isolated showers late.

MONDAY
East winds 15 to 20 knots. Seas 4 to 5 feet. Isolated
showers.

MONDAY NIGHT
East to southeast winds 15 to 20 knots. Seas 4 to
6 feet. Isolated showers in the evening, then scattered showers
after midnight.

TUESDAY
Southeast winds 15 to 20 knots, decreasing to near 15
knots. Seas 4 to 5 feet, subsiding to 3 to 4 feet. Scattered
showers in the morning, then isolated showers in the afternoon.

TUESDAY NIGHT
Southeast to south winds 10 to 15 knots, becoming
south and decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding
to around 2 feet. Scattered showers.

WEDNESDAY
Variable winds 5 to 10 knots, becoming northwest to
north and increasing to near 20 knots in the afternoon. Seas 1 to
2 feet, building to 3 to 6 feet in the afternoon. Scattered
showers.

WEDNESDAY NIGHT
North to northeast winds 20 to 25 knots. Seas
5 to 9 feet. Isolated showers.

THURSDAY
Northeast winds near 25 knots. Seas 7 to 10 feet.
Isolated showers.

THURSDAY NIGHT
Northeast to east winds near 25 knots. Seas 8
to 11 feet, subsiding to 7 to 10 feet. Isolated showers.

FRIDAY
Northeast to east winds 20 to 25 knots. Seas 5 to 9
feet. Scattered showers.

FRIDAY NIGHT
East winds 20 to 25 knots. Seas 5 to 8 feet.
Scattered showers.



GMZ033-034-160930-
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-
1025 PM EST Sun Dec 15 2019

SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS


OVERNIGHT
East winds near 15 knots, increasing to 15 to 20
knots. Seas 2 to 3 feet, building to 3 to 4 feet.

MONDAY
East winds near 15 knots. Seas 2 to 4 feet.

MONDAY NIGHT
East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Isolated showers in the evening, then scattered showers
after midnight.

TUESDAY
Southeast winds 10 to 15 knots. Seas 1 to 3 feet.
Scattered showers in the morning, then isolated showers in the
afternoon.

TUESDAY NIGHT
Southeast to south winds near 10 knots, becoming
variable and decreasing to near 5 knots. Seas 1 to 2 feet,
subsiding to around 1 foot. Scattered showers.

WEDNESDAY
Northwest to north winds 5 to 10 knots, becoming
north and increasing to 20 to 25 knots in the afternoon. Seas 1 to
2 feet, building to 5 to 8 feet in the afternoon. Scattered
showers.

WEDNESDAY NIGHT
North to northeast winds near 25 knots. Seas 7
to 10 feet. Isolated showers.

THURSDAY
Northeast winds 20 to 25 knots. Seas 5 to 9 feet.
Isolated showers.

THURSDAY NIGHT
Northeast to east winds near 25 knots. Seas 5
to 7 feet. Isolated showers.

FRIDAY
Northeast to east winds 20 to 25 knots. Seas 4 to 7
feet. Isolated showers.

FRIDAY NIGHT
Northeast to east winds near 20 knots. Seas 3 to
6 feet. Scattered showers.