019
FZUS52 KKEY 082117
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
417 PM EST Sat Nov 8 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.

GMZ005-090930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
417 PM EST Sat Nov 8 2025

.SYNOPSIS...High pressure will continue to slide eastward across
the central North Atlantic this afternoon through Sunday. This
will result in mainly light east to southeast breezes, potentially
becoming variable at times. A potent cold front will push through
the Florida Keys marine zones on Monday with fresh to strong
northerlies expected in its wake early next week. While the next
high builds in behind the front, winds will shift out of the
northeast and gradually slacken. Moderate to occasionally fresh
breezes will remain possible.

The Approximate Shoreward Edge of the Gulf Stream as of November
4...

42 NM South of Dry Tortugas Light...on Loggerhead Key.
42 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
30 NM South of Sand Key Light...off Key West.
29 NM South of Looe Key...off Big Pine Key.
27 NM Southeast of Sombrero Key Light...off Marathon.
14 NM Southeast of Alligator Reef Light...off Islamorada.
 4 NM Southeast of Molasses Reef Light...off Key Largo.
 3 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.

$$

GMZ031-090930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
417 PM EST Sat Nov 8 2025

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

$$

GMZ032-035-090930-
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-
417 PM EST Sat Nov 8 2025

.TONIGHT...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth.
.SUNDAY...Southeast winds near 5 knots, becoming variable. Seas
around 1 foot. Nearshore waters smooth. Isolated showers.
.SUNDAY NIGHT...Northwest winds near 5 knots, increasing to near
10 knots. Seas around 1 foot. Nearshore waters smooth, becoming a
light chop. Isolated showers.
.MONDAY...Northwest winds 10 to 15 knots, becoming northwest to
north and increasing to 25 to 30 knots. Seas 1 to 2 feet,
building to 2 to 3 feet. West of of the Marquesas Keys, seas 2 to
3 feet, building to 5 to 7 feet, occasionally to 9 feet.
Nearshore waters a light to moderate chop, becoming extremely
rough. Isolated showers.
.MONDAY NIGHT...Northwest to north winds 25 to 30 knots, becoming
north. Seas 2 to 4 feet, occasionally to 5 feet, except 6 to 9
feet, occasionally to 11 feet west of the Marquesas Keys.
Nearshore waters extremely rough.
.TUESDAY...North to northeast winds 25 to 30 knots, becoming
northeast and decreasing to 20 to 25 knots. Seas 2 to 4 feet,
occasionally to 5 feet, except 5 to 8 feet, occasionally to 10
feet west of the Marquesas Keys. Nearshore waters extremely
rough, becoming very rough.
.TUESDAY NIGHT...Northeast 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.
.WEDNESDAY...Northeast to east winds 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 choppy.
.WEDNESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Nearshore waters choppy.
.THURSDAY...Northeast winds 15 to 20 knots. Seas 2 to 3 feet.
Nearshore waters choppy.
.THURSDAY NIGHT...Northeast winds 15 to 20 knots. Seas 1 to
2 feet. Nearshore waters choppy.

$$

GMZ042>044-090930-
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 PM EST Sat Nov 8 2025

.TONIGHT...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Isolated showers.
.SUNDAY...Southeast winds near 5 knots, becoming south to
southwest. Seas 1 foot or less. Nearshore waters smooth. Isolated
showers.
.SUNDAY NIGHT...Northwest winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Isolated showers.
.MONDAY...Northwest winds 15 to 20 knots, increasing to northwest
to north 25 to 30 knots. Seas 1 to 2 feet. West of Cosgrove Shoal
Light, seas 1 to 2 feet, building to 5 to 7 feet, occasionally to
9 feet in the afternoon. Nearshore waters choppy, becoming
extremely rough. Isolated showers.
.MONDAY NIGHT...North winds 25 to 30 knots. Seas 2 to 4 feet,
occasionally to 5 feet, except 6 to 9 feet, occasionally to
11 feet west of Cosgrove Shoal Light. Nearshore waters extremely
rough.
.TUESDAY...North to northeast winds 25 to 30 knots, becoming
20 to 25 knots in the afternoon. Seas 2 to 4 feet, occasionally
to 5 feet, except 5 to 8 feet, occasionally to 10 feet west of
Cosgrove Shoal Light. Nearshore waters extremely rough, becoming
very rough.
.TUESDAY NIGHT...Northeast winds near 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet, except 4 to 6 feet, occasionally to
8 feet west of Cosgrove Shoal Light. Nearshore waters rough.
.WEDNESDAY...Northeast to east winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally
to 6 feet west of Cosgrove Shoal Light. Nearshore waters choppy.
.WEDNESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Nearshore waters choppy.
.THURSDAY...Northeast winds 15 to 20 knots. Seas 2 to 3 feet.
Nearshore waters choppy.
.THURSDAY NIGHT...Northeast winds 15 to 20 knots. Seas around
2 feet. Nearshore waters choppy.

$$

GMZ052>055-072>075-090930-
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 PM EST Sat Nov 8 2025

.TONIGHT...East to southeast winds 5 to 10 knots. Seas around
1 foot. Wave Detail: East 1 foot at 4 seconds. Isolated showers.
.SUNDAY...Southeast winds near 5 knots, becoming variable. Seas
around 1 foot. Wave Detail: East to southeast 1 foot at 3
seconds. Isolated showers.
.SUNDAY NIGHT...Northwest to north winds near 5 knots, becoming
northwest and increasing to near 10 knots. Seas around 1 foot,
building to 1 to 2 feet. Wave Detail: East 1 foot at 3 seconds.
Isolated showers.
.MONDAY...Northwest winds 10 to 15 knots, becoming northwest to
north and increasing to 20 to 25 knots. Seas 2 to 3 feet,
building to 4 to 7 feet, occasionally to 9 feet. Isolated showers.
.MONDAY NIGHT...Northwest to north winds 25 to 30 knots, becoming
north. Seas 5 to 8 feet, occasionally to 10 feet, building to 7
to 10 feet, occasionally to 13 feet.
.TUESDAY...North to northeast winds 25 to 30 knots, decreasing to
near 25 knots. Seas 7 to 10 feet, occasionally to 13 feet.
.TUESDAY NIGHT...Northeast to east winds 20 to 25 knots,
decreasing to near 20 knots. Seas 7 to 10 feet, occasionally to
12 feet, subsiding to 5 to 8 feet, occasionally to 10 feet.
.WEDNESDAY...Northeast to east winds 15 to 20 knots. Seas 5 to
7 feet, occasionally to 9 feet, subsiding to 4 to 6 feet,
occasionally to 7 feet.
.WEDNESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
4 to 6 feet, occasionally to 8 feet. Isolated showers.
.THURSDAY...Northeast winds near 20 knots. Seas 4 to 6 feet,
occasionally to 8 feet, subsiding to 3 to 4 feet, occasionally to
5 feet. Isolated showers.
.THURSDAY NIGHT...Northeast winds near 20 knots. Seas 2 to
4 feet, occasionally to 5 feet. Isolated showers.

$$

GMZ033-034-090930-
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-
417 PM EST Sat Nov 8 2025

.TONIGHT...East to southeast winds near 5 knots. Seas 1 foot or
less.
.SUNDAY...Southeast winds near 5 knots, becoming variable in the
afternoon. Seas 1 foot or less. Isolated showers.
.SUNDAY NIGHT...West to northwest near 5 knots, increasing to 10
to 15 knots. Seas 1 foot or less, building to 1 to 2 feet. Wave
Detail: Northwest 1 foot at 3 seconds. Isolated showers.
.MONDAY...Northwest to north winds 15 to 20 knots, becoming
northwest to north and increasing to 25 to 30 knots. Seas 2 to 4
feet, occasionally to 5 feet, building to 7 to 10 feet,
occasionally to 13 feet. Isolated showers.
.MONDAY NIGHT...Northwest to north winds 25 to 30 knots, becoming
north. Seas 8 to 10 feet, occasionally to 13 feet.
.TUESDAY...North to northeast winds 25 to 30 knots, becoming
northeast and decreasing to 20 to 25 knots. Seas 7 to 10 feet,
occasionally to 13 feet, subsiding to 5 to 8 feet, occasionally to
10 feet.
.TUESDAY NIGHT...Northeast winds near 20 knots, decreasing to 15
to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet, subsiding
to 4 to 5 feet, occasionally to 6 feet.
.WEDNESDAY...Northeast winds 15 to 20 knots, decreasing to near 15
knots. Seas 3 to 5 feet, occasionally to 6 feet.
.WEDNESDAY NIGHT...Northeast winds near 15 knots. Seas 2 to
4 feet, occasionally to 5 feet.
.THURSDAY...Northeast winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet.
.THURSDAY NIGHT...Northeast winds 15 to 20 knots. Seas around
2 feet.

$$

MJV/BT