HomeForecastsFlorida ForecastsMain Key, FL - Barnes Sound Coastal Forecast

Main Key, FL - Barnes Sound Coastal Forecast

FZUS52 KKEY 181535
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1035 AM EST Wed Dec 18 2024

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.

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.

GMZ005-182145-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1035 AM EST Wed Dec 18 2024

.SYNOPSIS...High pressure over the North Atlantic will continue
sliding farther east loosening its grip across the Florida Keys. As
a result, gentle to moderate northeast to east breezes will continue
to slacken during the day. Breezes will further slacken tonight
and Thursday becoming light to gentle ahead of an approaching weak
front. The weak front is anticipated to press through the Keys
sometime late Thursday resulting in freshening northerly breezes.
A secondary front is expected to press through the Keys late
Friday reinforcing the previous front. Dense fog will linger in
the deep Gulf through this afternoon.

The Approximate Shoreward Edge of the Gulf Stream as of December
15...

48 NM South of Dry Tortugas Light...on Loggerhead Key.
23 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
10 NM South of Sand Key Light...off Key West.
11 NM South of Looe Key...off Big Pine Key.
10 NM South of Sombrero Key Light...off Marathon.
9 NM Southeast of Alligator Reef Light...off Islamorada.
3 NM Southeast of Molasses Reef Light...off Key Largo.
4 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 the Real Time Ocean Forecast System.

$$

GMZ031-182145-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1035 AM EST Wed Dec 18 2024

.THIS AFTERNOON...East to southeast winds 5 to 10 knots. Bay
waters smooth to a light chop. Scattered showers.
.TONIGHT...East winds 5 to 10 knots, becoming northeast to east
and decreasing to near 5 knots. Bay waters smooth to a light
chop, becoming smooth. Scattered showers.
.THURSDAY...Northeast winds near 5 knots. Bay waters smooth.
Isolated showers.
.THURSDAY NIGHT...Northwest to north winds 5 to 10 knots,
becoming north. Bay waters smooth to a light chop. Isolated
showers in the evening.
.FRIDAY...Northwest to north winds 5 to 10 knots, becoming
northwest and increasing to near 10 knots. Bay waters smooth to a
light chop, becoming a light chop.
.FRIDAY NIGHT...Northwest winds 10 to 15 knots, becoming northwest
to north. Bay waters a light to moderate chop.
.SATURDAY...North winds 10 to 15 knots, decreasing to near 10
knots. Bay waters a light to moderate chop, becoming a light
chop.
.SATURDAY NIGHT...Northwest to north winds near 10 knots, becoming
north and increasing to 10 to 15 knots. Bay waters a light chop,
becoming a light to moderate chop.
.SUNDAY...North to northeast winds 10 to 15 knots. Bay waters a
light to moderate chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots. Bay waters a
light to moderate chop.

$$

GMZ032-035-182145-
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-
1035 AM EST Wed Dec 18 2024

.THIS AFTERNOON...East winds near 10 knots, decreasing to 5 to 10
knots. Seas 1 to 2 feet, subsiding to around 1 foot. West of the
Marquesas Keys, seas around 2 feet, subsiding to 1 to 2 feet.
Nearshore waters a light chop, becoming smooth to a light chop.
Isolated showers.
.TONIGHT...Northeast to east winds 5 to 10 knots, becoming north
to northeast. Seas 1 to 2 feet. Nearshore waters smooth to a
light chop. Isolated showers.
.THURSDAY...North to northeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Isolated showers.
.THURSDAY NIGHT...Northwest to north winds near 10 knots, becoming
north and increasing to 10 to 15 knots. Seas around 1 foot,
except building to 1 to 2 feet west of the Marquesas Keys.
Nearshore waters a light chop, becoming a light to moderate chop.
Isolated showers in the evening.
.FRIDAY...Northwest to north winds 10 to 15 knots. Seas 1 to
2 feet, except around 2 feet west of the Marquesas Keys.
Nearshore waters a light to moderate chop.
.FRIDAY NIGHT...Northwest to north winds near 15 knots. Seas 1 to
2 feet, except building to 2 to 3 feet west of the Marquesas
Keys. Nearshore waters a moderate chop.
.SATURDAY...North winds near 15 knots, decreasing to 10 to 15
knots. Seas 1 to 3 feet, except 2 to 4 feet, occasionally to 5
feet west of the Marquesas Keys. Nearshore waters a moderate chop,
becoming a light to moderate chop.
.SATURDAY NIGHT...North winds 10 to 15 knots, becoming north to
northeast. Seas 1 to 3 feet, except subsiding to around 3 feet
west of the Marquesas Keys. Nearshore waters a light to moderate
chop.
.SUNDAY...North to northeast winds 10 to 15 knots. Seas 1 to
2 feet, except subsiding to 2 to 3 feet west of the Marquesas
Keys. Nearshore waters a light to moderate chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 to 20 knots. Seas 1 to 2 feet, building to 2 to 3 feet. West
of the Marquesas Keys, seas 2 to 3 feet, building to 2 to 4 feet,
occasionally to 5 feet. Nearshore waters a light to moderate chop,
becoming choppy.

$$

GMZ042>044-182145-
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-
1035 AM EST Wed Dec 18 2024

.THIS AFTERNOON...East to southeast winds near 10 knots,
decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1 to 2
feet. Nearshore waters a light chop, becoming smooth to a light
chop. Isolated showers.
.TONIGHT...East winds 5 to 10 knots, becoming northeast to east.
Seas 1 to 2 feet. Nearshore waters smooth to a light chop.
Isolated showers.
.THURSDAY...North to northeast winds 5 to 10 knots. Seas 1 to
2 feet. Nearshore waters smooth to a light chop. Isolated
showers.
.THURSDAY NIGHT...North winds 5 to 10 knots, 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. Isolated
showers in the evening.
.FRIDAY...Northwest to north winds 10 to 15 knots. Seas 1 to 2
feet. Nearshore waters a light to moderate chop.
.FRIDAY NIGHT...Northwest to north winds near 15 knots. Seas 1 to
2 feet, except 2 to 3 feet west of Cosgrove Shoal Light.
Nearshore waters a moderate chop.
.SATURDAY...North winds near 15 knots, decreasing to 10 to 15
knots. Seas 1 to 2 feet, except around 3 feet west of Cosgrove
Shoal Light. Nearshore waters a moderate chop, becoming a light to
moderate chop.
.SATURDAY NIGHT...North winds 10 to 15 knots, becoming north to
northeast. Seas 1 to 2 feet, except around 3 feet west of
Cosgrove Shoal Light. Nearshore waters a light to moderate chop.
.SUNDAY...North to northeast winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots. Seas 1 to 3 feet, building to 2 to 3 feet. West of
Cosgrove Shoal Light, seas 2 to 3 feet. building to 3 to 4 feet,
occasionally to 6 feet. Nearshore waters a moderate chop, becoming
choppy.

$$

GMZ052>055-072>075-182145-
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-
1035 AM EST Wed Dec 18 2024

.THIS AFTERNOON...East to southeast winds 10 to 15 knots,
decreasing to near 10 knots. Seas 3 to 4 feet, occasionally to 5
feet, subsiding to 2 to 3 feet. Wave Detail:
East 4 feet at 6 seconds. Isolated showers.
.TONIGHT...East winds 10 to 15 knots, becoming northeast to east
and decreasing to 5 to 10 knots. Seas 2 to 3 feet, subsiding to 1
to 3 feet. Wave Detail: East 3 feet at 6 seconds. Scattered
showers.
.THURSDAY...North to northeast winds 5 to 10 knots. Seas 1 to 3
feet. Wave Detail: Northeast to east 2 feet at 5 seconds.
Isolated showers.
.THURSDAY NIGHT...North to northeast winds near 10 knots,
becoming north and increasing to 10 to 15 knots. Seas 1 to 2
feet, building to 1 to 3 feet. Isolated showers.
.FRIDAY...North winds 10 to 15 knots, becoming northwest to north.
Seas 2 to 3 feet.
.FRIDAY NIGHT...Northwest to north winds near 15 knots. Seas 2 to
4 feet, occasionally to 5 feet.
.SATURDAY...North winds near 15 knots, decreasing to 10 to 15
knots. Seas 2 to 4 feet, occasionally to 5 feet.
.SATURDAY NIGHT...North winds 10 to 15 knots, becoming north to
northeast. Seas 2 to 4 feet, occasionally to 5 feet.
.SUNDAY...North to northeast winds 10 to 15 knots, becoming
northeast. Seas 2 to 4 feet, occasionally to 5 feet.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15 to
20 knots. Seas 3 to 4 feet, occasionally to 5 feet, building to 4
to 5 feet, occasionally to 6 feet. Isolated showers.

$$

GMZ033-034-182145-
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-
1035 AM EST Wed Dec 18 2024

...DENSE FOG ADVISORY IN EFFECT...

.THIS AFTERNOON...Northeast to east winds near 10 knots,
decreasing to 5 to 10 knots. Seas 1 to 3 feet, subsiding to 1 to 2
feet. Wave Detail: Northeast to east 2 feet at 4 seconds. Areas
of fog.
.TONIGHT...Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Wave
Detail: Northeast to east 2 feet at 3 seconds. Isolated showers.
.THURSDAY...North to northeast winds 5 to 10 knots. Seas around 1
foot. Wave Detail: Northeast 1 foot at 3 seconds.
.THURSDAY NIGHT...Northwest to north winds near 10 knots, becoming
north and increasing to 10 to 15 knots. Seas 1 to 2 feet,
building to around 2 feet.
.FRIDAY...Northwest to north winds 10 to 15 knots. Seas around
2 feet.
.FRIDAY NIGHT...Northwest to north winds near 15 knots. Seas 2 to
4 feet, occasionally to 5 feet.
.SATURDAY...North winds near 15 knots, becoming north. Seas 3 to
4 feet, occasionally to 5 feet.
.SATURDAY NIGHT...North winds near 15 knots, becoming north to
northeast. Seas 3 to 4 feet, occasionally to 5 feet.
.SUNDAY...North to northeast winds 10 to 15 knots. Seas 2 to
3 feet.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to
15 to 20 knots. Seas 2 to 3 feet, building to 3 to 4 feet,
occasionally to 5 feet.

$$

AP/MJV


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