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Johnson Keys, FL - South End Coastal Forecast

FZUS52 KKEY 150329
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1029 PM EST Sun Dec 14 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.

GMZ005-151530-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1029 PM EST Sun Dec 14 2025

.SYNOPSIS...A cold front currently draped across South Florida
extends southwestward into the Gulf. The front will continue
moving southward overnight leading to freshening north to
northeast breezes. In the wake of the front, fresh to strong
northeasterly breezes are expected through at least Tuesday.
Breezes slacken starting Wednesday but will remain gentle to
moderate at times.

The Approximate Shoreward Edge of the Gulf Stream as of December 8...

15 NM South of Dry Tortugas Light...on Loggerhead Key.
13 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
14 NM South of Sand Key Light...off Key West.
18 NM South of Looe Key...off Big Pine Key.
23 NM Southeast of Sombrero Key Light...off Marathon.
18 NM Southeast of Alligator Reef Light...off Islamorada.
12 NM Southeast of Molasses Reef Light...off Key Largo.
8 NM Southeast 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 and RTOFS.

$$

GMZ031-151530-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1029 PM EST Sun Dec 14 2025

...SMALL CRAFT SHOULD EXERCISE CAUTION FOR INCREASING WINDS...
...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED EARLY MONDAY
MORNING...

.OVERNIGHT...Northwest to north winds near 15 knots, becoming
north to northeast near 20 knots late. Bay waters a moderate
chop, becoming rough. Isolated showers.
.MONDAY...Northeast winds 20 to 25 knots. Bay waters very rough.
Isolated showers.
.MONDAY NIGHT...Northeast winds 20 to 25 knots. Bay waters very
rough. Isolated showers.
.TUESDAY...Northeast to east winds near 20 knots. Bay waters
rough.
.TUESDAY NIGHT...Northeast to east winds 15 to 20 knots,
decreasing to near 15 knots. Bay waters choppy, becoming a
moderate chop.
.WEDNESDAY...East winds decreasing to 10 to 15 knots. Bay waters
becoming a light to moderate chop.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Bay waters a light
to moderate chop.
.THURSDAY...East winds 10 to 15 knots. Bay waters a light to
moderate chop. Isolated showers.
.THURSDAY NIGHT...East to southeast winds near 10 knots. Bay
waters a light chop. Isolated showers.
.FRIDAY...East to southeast winds 5 to 10 knots, becoming west to
northwest. Bay waters smooth to a light chop. Isolated showers.
.FRIDAY NIGHT...North to northeast winds increasing to near 10
knots. Bay waters becoming a light chop.

$$

GMZ032-035-151530-
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-
1029 PM EST Sun Dec 14 2025

...SMALL CRAFT SHOULD EXERCISE CAUTION...
...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED EARLY MONDAY
MORNING...

.OVERNIGHT...Northwest to north winds 15 to 20 knots, becoming
north to northeast and increasing to 20 to 25 knots late. Seas
1 to 2 feet, building to 2 to 3 feet, except building to 3 to 4
feet, occasionally to 5 feet west of the Marquesas Keys. Nearshore
waters choppy, becoming very rough. Isolated showers.
.MONDAY...Northeast winds near 25 knots, decreasing to 20 to 25
knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 7
feet, occasionally to 9 feet west of the Marquesas Keys.
Nearshore waters extremely rough, becoming very rough. Isolated
showers.
.MONDAY NIGHT...Northeast winds 20 to 25 knots. Seas 3 to 5 feet,
occasionally to 6 feet, except 5 to 6 feet, occasionally to 8
feet west of the Marquesas Keys. Nearshore waters very rough.
Isolated showers.
.TUESDAY...Northeast to east winds near 20 knots. Seas 2 to 4
feet, occasionally to 5 feet, except 4 to 6 feet, occasionally to
8 feet west of the Marquesas Keys. Nearshore waters rough.
.TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 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 rough, becoming choppy.
.WEDNESDAY...East winds 15 to 20 knots, decreasing to near 15
knots. Seas 2 to 3 feet, except 3 to 4 feet, occasionally to 5
feet west of the Marquesas Keys. Nearshore waters choppy, becoming
a moderate chop.
.WEDNESDAY NIGHT...East winds near 15 knots. Seas 1 to 2 feet,
except 2 to 3 feet west of the Marquesas Keys. Nearshore waters a
moderate chop.
.THURSDAY...East winds decreasing to 10 to 15 knots. Seas
1 to 2 feet, subsiding to around 1 foot. West of the Marquesas
Keys, seas 2 to 3 feet, subsiding to 1 to 2 feet. Nearshore
waters becoming a light to moderate chop. Isolated showers.
.THURSDAY NIGHT...East to southeast winds near 10 knots. Seas
1 to 2 feet, subsiding to 1 foot or less. Nearshore waters a
light chop. Isolated showers.
.FRIDAY...Northeast to east winds 5 to 10 knots, becoming north
near 10 knots. Seas 1 foot or less. Nearshore waters smooth to a
light chop, becoming a light chop. Isolated showers.
.FRIDAY NIGHT...North to northeast winds increasing to 10 to 15
knots. Seas around 1 foot, building to 1 to 2 feet. Nearshore
waters becoming a light to moderate chop.

$$

GMZ042>044-151530-
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-
1029 PM EST Sun Dec 14 2025

...SMALL CRAFT SHOULD EXERCISE CAUTION...
...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED EARLY MONDAY
MORNING...

.OVERNIGHT...Northwest to north winds 15 to 20 knots, becoming
north to northeast and increasing to 20 to 25 knots late. Seas 1
to 2 feet, building to 2 to 3 feet. West of Cosgrove Shoal Light,
seas 1 to 2 feet, building to 3 to 4 feet, occasionally to 5 feet.
Nearshore waters choppy, becoming very rough. Isolated showers.
.MONDAY...Northeast winds near 25 knots. Seas 3 to 5 feet,
occasionally to 6 feet, except 4 to 6 feet, occasionally to 8
feet west of Cosgrove Shoal Light. Nearshore waters extremely
rough. Isolated showers.
.MONDAY NIGHT...Northeast winds near 25 knots. Seas 3 to 5 feet,
occasionally to 6 feet, except 4 to 6 feet, occasionally to 8
feet west of Cosgrove Shoal Light. Nearshore waters extremely
rough. Isolated showers.
.TUESDAY...Northeast to east winds 20 to 25 knots, decreasing to
near 20 knots. Seas 3 to 5 feet, occasionally to 6 feet.
Nearshore waters very rough, becoming rough.
.TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet.
Nearshore waters rough, becoming choppy.
.WEDNESDAY...East winds 15 to 20 knots, decreasing to near 15
knots. Seas 2 to 4 feet, occasionally to 5 feet. Nearshore waters
choppy, becoming a moderate chop.
.WEDNESDAY NIGHT...East winds near 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters choppy.
.THURSDAY...East to southeast winds decreasing to 10 to 15 knots.
Seas 2 to 3 feet. Nearshore waters becoming a light to moderate
chop. Isolated showers.
.THURSDAY NIGHT...East to southeast winds near 10 knots. Seas
subsiding to 1 to 2 feet. Nearshore waters a light chop. Isolated
showers.
.FRIDAY...Northeast to east winds 5 to 10 knots, becoming north to
northeast. Seas around 1 foot. Nearshore waters smooth to a light
chop. Isolated showers.
.FRIDAY NIGHT...North to northeast winds near 10 knots,
increasing to 10 to 15 knots. Seas around 1 foot, building to 1 to
2 feet. Nearshore waters a light chop, becoming a light to
moderate chop.

$$

GMZ052>055-072>075-151530-
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-
1029 PM EST Sun Dec 14 2025

...SMALL CRAFT SHOULD EXERCISE CAUTION...
...SMALL CRAFT ADVISORY LIKELY WILL BE REQUIRED EARLY MONDAY
MORNING...

.OVERNIGHT...North to northeast winds 15 to 20 knots, increasing
to 20 to 25 knots late. Seas 2 to 4 feet, occasionally to 5 feet,
building to 3 to 5 feet, occasionally to 6 feet. Wave Detail:
Northeast 3 feet at 5 seconds, becoming north to northeast 4 feet
at 5 seconds. Scattered showers.
.MONDAY...Northeast winds near 25 knots. Seas 5 to 7 feet,
occasionally to 9 feet, building to 7 to 10 feet, occasionally to
12 feet. Wave Detail: Northeast 6 feet at 6 seconds, becoming
northeast 8 feet at 7 seconds. Scattered showers.
.MONDAY NIGHT...Northeast to east winds near 25 knots. Seas 8 to
10 feet, occasionally to 12 feet. Wave Detail: Northeast to east
9 feet at 7 seconds and northwest to north 3 feet at 8 seconds.
Scattered showers.
.TUESDAY...Northeast to east winds near 25 knots. Seas 7 to 10
feet, occasionally to 12 feet. Isolated showers.
.TUESDAY NIGHT...Northeast to east winds 20 to 25 knots,
decreasing to near 20 knots. Seas 6 to 9 feet, occasionally to 11
feet, subsiding to 5 to 7 feet, occasionally to 9 feet. Isolated
showers.
.WEDNESDAY...East winds 15 to 20 knots. Seas 5 to 7 feet,
occasionally to 9 feet, subsiding to 4 to 6 feet, occasionally to
8 feet. Isolated showers.
.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet. Isolated showers.
.THURSDAY...East to southeast winds near 15 knots, decreasing to 10
to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet, subsiding
to 2 to 4 feet, occasionally to 5 feet. Isolated showers.
.THURSDAY NIGHT...East to southeast winds 10 to 15 knots,
decreasing to near 10 knots. Seas 2 to 3 feet. Isolated showers.
.FRIDAY...East winds 5 to 10 knots, becoming northeast. Seas
subsiding to 1 to 2 feet. Isolated showers.
.FRIDAY NIGHT...Northeast winds near 10 knots, increasing to 10
to 15 knots. Seas building to around 2 feet. Isolated showers.

$$

GMZ033-034-151530-
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-
1029 PM EST Sun Dec 14 2025

...SMALL CRAFT ADVISORY IN EFFECT...

.OVERNIGHT...North to northeast near 20 knots, increasing to 20
to 25 knots late. Seas 2 to 3 feet, building to 4 to 6 feet,
occasionally to 8 feet. Wave Detail: Northwest to north 2 feet at
3 seconds, becoming north 5 feet at 5 seconds. Isolated showers.
.MONDAY...Northeast winds near 25 knots, briefly decreasing to
20 to 25 knots in the afternoon. Seas 5 to 7 feet, occasionally
to 9 feet, subsiding to 4 to 6 feet, occasionally to 8 feet. Wave
Detail: North 5 feet at 6 seconds.
.MONDAY NIGHT...Northeast winds 20 to 25 knots, decreasing to near
20 knots. Seas 4 to 6 feet, occasionally to 8 feet, subsiding to
3 to 5 feet, occasionally to 7 feet. Wave Detail: Northeast 5
feet at 5 seconds and northwest to north 3 feet at 8 seconds.
Isolated showers.
.TUESDAY...Northeast to east winds near 20 knots, briefly
decreasing to 15 to 20 knots in the afternoon. Seas 3 to 5 feet,
occasionally to 6 feet, subsiding to 3 to 4 feet, occasionally to
5 feet.
.TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots. Seas 3 to 4 feet, occasionally to 6 feet.
.WEDNESDAY...East winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Isolated showers.
.WEDNESDAY NIGHT...East winds 15 to 20 knots, decreasing to near
15 knots. Seas 2 to 4 feet, occasionally to 5 feet.
.THURSDAY...East winds decreasing to 10 to 15 knots. Seas
subsiding to around 2 feet. Isolated showers.
.THURSDAY NIGHT...East to southeast winds near 10 knots,
decreasing to 5 to 10 knots. Seas 1 to 2 feet. Isolated showers.
.FRIDAY...Northeast to east winds 5 to 10 knots, becoming north
near 10 knots. Seas around 1 foot. Isolated showers.
.FRIDAY NIGHT...North to northeast winds increasing to 10 to 15
knots. Seas building to 1 to 2 feet.

$$

MJV


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