509
FZUS52 KKEY 192025
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
425 PM EDT Thu Sep 19 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.

GMZ005-200230-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
425 PM EDT Thu Sep 19 2024

.SYNOPSIS...Light and often variable breezes will continue tonight
into tomorrow due to a persistent trough/low near the Atlantic
Coast and a weak high east of the Bahamas. Heading into this
weekend, the low will meander further out into the Atlantic as
ridging expands its control across the southeastern United
States. As a result, winds will finally begin to take on a
dominant, yet light, broadly easterly direction. Confidence in the
extended remains very low and will be highly dependent on the
expected formation of a low in the northwestern Caribbean Sea. Any
development would have a good chance of freshening east to
southeasterly breezes.

The Approximate Shoreward Edge of the Gulf Stream as of September
18...

63 NM South of Dry Tortugas Light...on Loggerhead Key.
23 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
 8 NM South of Sand Key Light...off Key West.
12 NM South of Looe Key...off Big Pine Key.
13 NM South of Sombrero Key Light...off Marathon.
 6 NM Southeast of Alligator Reef Light...off Islamorada.
 4 NM Southeast of Molasses Reef Light...off Key Largo.
 5 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the National Weather Service in
Key West.

$$

GMZ031-200230-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
425 PM EDT Thu Sep 19 2024

.TONIGHT...Variable winds near 5 knots. Bay waters smooth.
Scattered showers and isolated thunderstorms.
.FRIDAY...Variable winds near 5 knots, becoming east to southeast.
Bay waters smooth. Scattered showers and isolated thunderstorms.
.FRIDAY NIGHT...East winds near 5 knots. Bay waters smooth.
Scattered showers and isolated thunderstorms.
.SATURDAY...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SATURDAY NIGHT...East winds 5 to 10 knots, becoming northeast to
east. Bay waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.SUNDAY...Northeast to east winds near 10 knots. Bay waters a
light chop. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...East winds near 10 knots. Bay waters a light
chop. Scattered showers and isolated thunderstorms.
.MONDAY...East winds 10 to 15 knots. Bay waters a light to
moderate chop. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT THROUGH TUESDAY NIGHT...East winds near 15 knots.
Bay waters a moderate chop. Scattered showers and isolated
thunderstorms.

$$

GMZ032-035-200230-
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-
425 PM EDT Thu Sep 19 2024

.TONIGHT...Northwest winds near 5 knots early this evening,
becoming variable. Seas 1 foot or less. Nearshore waters smooth.
Scattered showers and isolated thunderstorms.
.FRIDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...East winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.SATURDAY...Northeast to east winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.SUNDAY...Northeast to east winds near 10 knots. Seas 1 foot or
less. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas building to 1 to 2
feet. Nearshore waters a light to moderate chop. Scattered
showers and isolated thunderstorms.
.MONDAY...East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore
waters a light to moderate chop. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East 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. Scattered showers and isolated
thunderstorms.
.TUESDAY...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. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 1 to 2 feet,
building to 2 to 4 feet. West of the Marquesas Keys, seas around
3 feet, building to 3 to 5 feet. Nearshore waters choppy.
Scattered showers and isolated thunderstorms.

$$

GMZ042>044-200230-
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-
425 PM EDT Thu Sep 19 2024

.TONIGHT...Northwest to north winds near 5 knots, becoming
variable. Seas 1 foot or less. Nearshore waters smooth. Scattered
showers and isolated thunderstorms.
.FRIDAY...Variable winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...East winds near 5 knots. Seas 1 foot or less.
Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.SATURDAY...Northeast to east winds 5 to 10 knots. Seas 1 foot or
less. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.SUNDAY...Northeast to east winds near 10 knots. Seas around
1 foot. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas building to 1 to 2
feet. Nearshore waters a light to moderate chop. Scattered showers
and isolated thunderstorms.
.MONDAY...East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore
waters a light to moderate chop. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet.
Nearshore waters a moderate chop. Scattered showers and isolated
thunderstorms.
.TUESDAY...East winds near 15 knots. Seas 2 to 3 feet. Nearshore
waters a moderate chop. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 2 to 3 feet.
West of Cosgrove Shoal Light, seas building to 3 to 5 feet.
Nearshore waters choppy. Scattered showers and isolated
thunderstorms.

$$

GMZ052>055-072>075-200230-
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-
425 PM EDT Thu Sep 19 2024

.TONIGHT...Variable winds near 5 knots. Seas 1 foot or less. Wave
Detail: East 1 foot at 3 seconds. Scattered showers and isolated
thunderstorms.
.FRIDAY...Variable winds near 5 knots. Seas 1 foot or less. Wave
Detail:
East 1 foot at 3 seconds. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...East winds near 5 knots. Seas 1 foot or less.
Wave Detail: Northeast to east 1 foot at 3 seconds. Scattered
showers and isolated thunderstorms.
.SATURDAY...Northeast to east winds 5 to 10 knots. Seas around 1
foot. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Scattered showers and isolated thunderstorms.
.SUNDAY...Northeast to east winds 5 to 10 knots. Seas 1 to 2
feet. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...East winds near 10 knots. Seas building to 1 to 3
feet. Scattered showers and isolated thunderstorms.
.MONDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Scattered
showers and isolated thunderstorms.
.MONDAY NIGHT...East winds near 15 knots. Seas 2 to 4 feet.
Scattered showers and isolated thunderstorms.
.TUESDAY...East winds 15 to 20 knots. Seas 3 to 5 feet. Scattered
showers and isolated thunderstorms.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas building to 4 to
6 feet. Scattered showers and isolated thunderstorms.

$$

GMZ033-034-200230-
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-
425 PM EDT Thu Sep 19 2024

.TONIGHT...Northwest to north winds near 5 knots this evening,
becoming light and variable. Seas 1 foot or less. Scattered
showers and isolated thunderstorms.
.FRIDAY...North to northeast winds near 5 knots. Seas 1 foot or
less. Scattered showers and isolated thunderstorms.
.FRIDAY NIGHT...Northeast to east winds near 5 knots. Seas 1 foot
or less. Scattered showers and isolated thunderstorms.
.SATURDAY...Northeast to east winds 5 to 10 knots. Seas 1 foot or
less. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas around 1 foot.
Scattered showers and isolated thunderstorms.
.SUNDAY...Northeast to east winds 5 to 10 knots. Seas around
1 foot. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to
15 knots. Seas building to 1 to 2 feet. Scattered showers and
isolated thunderstorms.
.MONDAY...East winds 10 to 15 knots. Seas around 2 feet.
Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...East winds near 15 knots. Seas 2 to 3 feet.
Scattered showers and isolated thunderstorms.
.TUESDAY...East winds near 15 knots. Seas building to 2 to 3
feet. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas building to 3 to
6 feet. Scattered showers and isolated thunderstorms.

$$