FZUS52 KKEY 182030
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
430 PM EDT Thu Sep 18 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.
GMZ005-190830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
430 PM EDT Thu Sep 18 2025
.SYNOPSIS...
Weak upper-level troughiness, coupled with a decaying frontal
boundary draped over the Florida Peninsula, will support bouts of
above normal rain chances tonight. As drier air pushes across the
Keys and high pressure builds across the Eastern Seaboard, drier
conditions, coupled with light to gentle northeast to east
breezes, are expected for Friday through the weekend.
The Approximate Shoreward Edge of the Gulf Stream as of September
16...
53 NM South of Dry Tortugas Light...on Loggerhead Key.
40 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
32 NM South of Sand Key Light...off Key West.
15 NM South of Looe Key...off Big Pine Key.
17 NM Southeast of Sombrero Key Light...off Marathon.
14 NM Southeast of Alligator Reef Light...off Islamorada.
13 NM Southeast of Molasses Reef Light...off Key Largo.
9 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.
$$
GMZ031-190830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast winds near 10 knots, decreasing to 5 to 10
knots. Bay waters a light chop, becoming smooth to a light chop.
Scattered showers and isolated thunderstorms.
.FRIDAY...North to northeast winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots. Bay waters smooth
to a light chop. Scattered showers and isolated thunderstorms.
.SATURDAY...Northeast winds 5 to 10 knots. Bay waters smooth to a
light chop. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Bay waters smooth
to a light chop. Scattered showers and isolated thunderstorms.
.SUNDAY...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.MONDAY AND MONDAY NIGHT...East to southeast winds near 5 knots.
Bay waters smooth. Scattered showers and isolated thunderstorms.
.TUESDAY...Southeast to south winds near 5 knots. Bay waters
smooth. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Bay waters
smooth. Scattered showers and isolated thunderstorms.
$$
GMZ032-035-190830-
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-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet,
subsiding to around 1 foot. Nearshore waters a light chop.
Scattered showers and isolated thunderstorms.
.FRIDAY...North to northeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SATURDAY...North to northeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SATURDAY NIGHT...North to northeast 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 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SUNDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.MONDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
1 foot or less. Nearshore waters smooth to a light chop.
Scattered showers and isolated thunderstorms.
.TUESDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. Scattered showers and
isolated thunderstorms.
$$
GMZ042>044-190830-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Scattered showers and isolated
thunderstorms.
.FRIDAY...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Scattered showers and isolated
thunderstorms.
.SATURDAY...Northeast winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SUNDAY...Northeast winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.SUNDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.MONDAY...East to southeast winds near 5 knots. Seas around
1 foot. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.TUESDAY...Southeast to south winds near 5 knots. Seas around
1 foot or less. Nearshore waters smooth. Scattered showers and
isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. Scattered showers and
isolated thunderstorms.
$$
GMZ052>055-072>075-190830-
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-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast winds 10 to 15 knots,decreasing to near 10
knots. Seas 2 to 3 feet, subsiding around 2 feet. Wave Detail:
Northeast 2 feet at 5 seconds. Scattered showers and isolated
thunderstorms.
.FRIDAY...Northeast winds near 10 knots. Seas around 2 feet. Wave
Detail: Northeast 2 feet at 4 seconds. Scattered showers and
isolated thunderstorms.
.FRIDAY NIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet.
Wave Detail: Northeast 1 foot at 4 seconds. Scattered showers and
isolated thunderstorms.
.SATURDAY...Northeast winds 5 to 10 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...Northeast winds near 10 knots. Seas 1 to
2 feet. 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...Northeast to east winds 5 to 10 knots. Seas 1 to
2 feet. Scattered showers and isolated thunderstorms.
.MONDAY...Southeast winds near 5 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Scattered showers and isolated thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas around 1
foot. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Seas around
1 foot. Scattered showers and isolated thunderstorms.
$$
GMZ033-034-190830-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast to east winds near 10 knots. Seas 1 to 2
feet. Wave Detail: Northeast to east 1 foot at 3 seconds.
Scattered showers and isolated thunderstorms.
.FRIDAY...Northeast winds near 10 knots. Seas 1 to 2 feet. Wave
Detail: Northeast 1 foot at 4 seconds. Scattered showers and
isolated thunderstorms.
.FRIDAY NIGHT...Northeast winds 10 to 15 knots. Seas 1 to 3 feet.
Wave Detail: Northeast 2 feet at 4 seconds. Scattered showers and
isolated thunderstorms.
.SATURDAY...Northeast winds near 10 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...Northeast winds 10 to 15 knots. Seas 1 to
3 feet. Scattered showers and isolated thunderstorms.
.SUNDAY...Northeast winds 5 to 10 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...Northeast to east winds near 10 knots. Seas 1 to
2 feet. Scattered showers and isolated thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas around 1 foot. Scattered
showers and isolated thunderstorms.
.MONDAY NIGHT...Northeast to east winds 5 to 10 knots, becoming
east to southeast. Seas around 1 foot. Scattered showers and
isolated thunderstorms.
.TUESDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Seas
1 foot or less. Scattered showers and isolated thunderstorms.
$$
BT/AP
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
430 PM EDT Thu Sep 18 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.
GMZ005-190830-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
430 PM EDT Thu Sep 18 2025
.SYNOPSIS...
Weak upper-level troughiness, coupled with a decaying frontal
boundary draped over the Florida Peninsula, will support bouts of
above normal rain chances tonight. As drier air pushes across the
Keys and high pressure builds across the Eastern Seaboard, drier
conditions, coupled with light to gentle northeast to east
breezes, are expected for Friday through the weekend.
The Approximate Shoreward Edge of the Gulf Stream as of September
16...
53 NM South of Dry Tortugas Light...on Loggerhead Key.
40 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
32 NM South of Sand Key Light...off Key West.
15 NM South of Looe Key...off Big Pine Key.
17 NM Southeast of Sombrero Key Light...off Marathon.
14 NM Southeast of Alligator Reef Light...off Islamorada.
13 NM Southeast of Molasses Reef Light...off Key Largo.
9 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.
$$
GMZ031-190830-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast winds near 10 knots, decreasing to 5 to 10
knots. Bay waters a light chop, becoming smooth to a light chop.
Scattered showers and isolated thunderstorms.
.FRIDAY...North to northeast winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots. Bay waters smooth
to a light chop. Scattered showers and isolated thunderstorms.
.SATURDAY...Northeast winds 5 to 10 knots. Bay waters smooth to a
light chop. Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Bay waters smooth
to a light chop. Scattered showers and isolated thunderstorms.
.SUNDAY...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...Northeast to east winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.MONDAY AND MONDAY NIGHT...East to southeast winds near 5 knots.
Bay waters smooth. Scattered showers and isolated thunderstorms.
.TUESDAY...Southeast to south winds near 5 knots. Bay waters
smooth. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Bay waters
smooth. Scattered showers and isolated thunderstorms.
$$
GMZ032-035-190830-
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-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet,
subsiding to around 1 foot. Nearshore waters a light chop.
Scattered showers and isolated thunderstorms.
.FRIDAY...North to northeast winds near 10 knots. Seas around 1
foot. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SATURDAY...North to northeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SATURDAY NIGHT...North to northeast 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 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SUNDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.MONDAY...East to southeast winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
1 foot or less. Nearshore waters smooth to a light chop.
Scattered showers and isolated thunderstorms.
.TUESDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. Scattered showers and
isolated thunderstorms.
$$
GMZ042>044-190830-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Scattered showers and isolated
thunderstorms.
.FRIDAY...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Scattered showers and isolated
thunderstorms.
.FRIDAY NIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Scattered showers and isolated
thunderstorms.
.SATURDAY...Northeast winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Seas around 1
foot. Nearshore waters smooth to a light chop. Scattered showers
and isolated thunderstorms.
.SUNDAY...Northeast winds 5 to 10 knots. Seas around 1 foot.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.SUNDAY NIGHT...Northeast to east winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.MONDAY...East to southeast winds near 5 knots. Seas around
1 foot. Nearshore waters smooth. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Nearshore waters smooth to a light chop. Scattered
showers and isolated thunderstorms.
.TUESDAY...Southeast to south winds near 5 knots. Seas around
1 foot or less. Nearshore waters smooth. Scattered showers and
isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Seas
1 foot or less. Nearshore waters smooth. Scattered showers and
isolated thunderstorms.
$$
GMZ052>055-072>075-190830-
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-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast winds 10 to 15 knots,decreasing to near 10
knots. Seas 2 to 3 feet, subsiding around 2 feet. Wave Detail:
Northeast 2 feet at 5 seconds. Scattered showers and isolated
thunderstorms.
.FRIDAY...Northeast winds near 10 knots. Seas around 2 feet. Wave
Detail: Northeast 2 feet at 4 seconds. Scattered showers and
isolated thunderstorms.
.FRIDAY NIGHT...Northeast winds near 10 knots. Seas 1 to 2 feet.
Wave Detail: Northeast 1 foot at 4 seconds. Scattered showers and
isolated thunderstorms.
.SATURDAY...Northeast winds 5 to 10 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...Northeast winds near 10 knots. Seas 1 to
2 feet. 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...Northeast to east winds 5 to 10 knots. Seas 1 to
2 feet. Scattered showers and isolated thunderstorms.
.MONDAY...Southeast winds near 5 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...East to southeast winds 5 to 10 knots. Seas
around 1 foot. Scattered showers and isolated thunderstorms.
.TUESDAY...Southeast to south winds 5 to 10 knots. Seas around 1
foot. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Seas around
1 foot. Scattered showers and isolated thunderstorms.
$$
GMZ033-034-190830-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
430 PM EDT Thu Sep 18 2025
.TONIGHT...Northeast to east winds near 10 knots. Seas 1 to 2
feet. Wave Detail: Northeast to east 1 foot at 3 seconds.
Scattered showers and isolated thunderstorms.
.FRIDAY...Northeast winds near 10 knots. Seas 1 to 2 feet. Wave
Detail: Northeast 1 foot at 4 seconds. Scattered showers and
isolated thunderstorms.
.FRIDAY NIGHT...Northeast winds 10 to 15 knots. Seas 1 to 3 feet.
Wave Detail: Northeast 2 feet at 4 seconds. Scattered showers and
isolated thunderstorms.
.SATURDAY...Northeast winds near 10 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.SATURDAY NIGHT...Northeast winds 10 to 15 knots. Seas 1 to
3 feet. Scattered showers and isolated thunderstorms.
.SUNDAY...Northeast winds 5 to 10 knots. Seas 1 to 2 feet.
Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...Northeast to east winds near 10 knots. Seas 1 to
2 feet. Scattered showers and isolated thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas around 1 foot. Scattered
showers and isolated thunderstorms.
.MONDAY NIGHT...Northeast to east winds 5 to 10 knots, becoming
east to southeast. Seas around 1 foot. Scattered showers and
isolated thunderstorms.
.TUESDAY...Southeast to south winds near 5 knots. Seas 1 foot or
less. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 5 knots. Seas
1 foot or less. Scattered showers and isolated thunderstorms.
$$
BT/AP