683
FZUS52 KKEY 092033
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
433 PM EDT Sun Mar 9 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.

GMZ005-100245-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
433 PM EDT Sun Mar 9 2025

.SYNOPSIS...Variable breezes tonight will give way to slightly
fresher southerlies tomorrow morning. A low pressure system
developing into a Gulf Low over the Florida Panhandle will force a
cold frontal passage across the Florida Keys late Monday with
a greater chance of shower and thunderstorms in the afternoon.
Northwesterly breezes in the aftermath of the cold front will
gradually slacken from fresh to strong to gentle to moderate
midweek. High pressure over the Gulf will provide uneventful
conditions until Friday when breezes may increase to fresh.

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

35 NM South of Dry Tortugas Light...on Loggerhead Key.
19 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
16 NM South of Sand Key Light...off Key West.
 8 NM South of Looe Key...off Big Pine Key.
 8 NM South of Sombrero Key Light...off Marathon.
 7 NM Southeast of Alligator Reef Light...off Islamorada.
 6 NM Southeast of Molasses Reef Light...off Key Largo.
 3 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 and
NASA SPoRT.

$$

GMZ031-100245-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
433 PM EDT Sun Mar 9 2025

.TONIGHT...Variable winds near 5 knots, becoming south and
increasing to near 10 knots. Bay waters smooth, becoming a light
chop.
.MONDAY...South to southwest winds 10 to 15 knots, becoming
southwest to west and increasing to near 20 knots in the
afternoon. Bay waters a light to moderate chop, becoming rough.
Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...Northwest winds 20 to 25 knots, decreasing to near
20 knots. Bay waters very rough, becoming rough. Isolated
showers.
.TUESDAY...Northwest winds 15 to 20 knots, becoming northwest to
north and decreasing to 10 to 15 knots. Bay waters choppy,
becoming a light to moderate chop.
.TUESDAY NIGHT...North winds 5 to 10 knots. Bay waters smooth to
a light chop.
.WEDNESDAY...Northeast to east winds near 10 knots. Bay waters a
light chop.
.WEDNESDAY NIGHT...East to southeast winds 10 to 15 knots. Bay
waters a light to moderate chop.
.THURSDAY...East to southeast winds near 10 knots. Bay waters a
light chop.
.THURSDAY NIGHT...East to southeast winds 5 to 10 knots. Bay
waters smooth to a light chop.
.FRIDAY...East to southeast winds near 10 knots. Bay waters
a light chop.
.FRIDAY NIGHT...East to southeast winds 10 to 15 knots. Bay
waters a light to moderate chop.

$$

GMZ032-035-100245-
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-
433 PM EDT Sun Mar 9 2025

.TONIGHT...Variable winds near 5 knots, becoming south and
increasing to near 10 knots. Seas 1 foot or less, building to
around 1 foot. West of the Marquesas Keys, seas around 1 foot,
building to around 2 feet. Nearshore waters smooth, becoming a
light chop. Isolated showers.
.MONDAY...South to southwest winds 10 to 15 knots, becoming
southwest to west and increasing to near 20 knots in the
afternoon. Seas 1 to 2 feet, building to 2 to 3 feet. West of the
Marquesas Keys, seas around 2 feet, building to 3 to 4 feet. Nearshore
waters a light to moderate chop, becoming rough. Scattered
showers and isolated thunderstorms.
.MONDAY NIGHT...Northwest winds 20 to 25 knots, decreasing to near
20 knots. Seas building to 3 to 5 feet, occasionally to 6 feet.
West of the Marquesas Keys, seas building to 5 to 7 feet,
occasionally to 9 feet. Nearshore waters very rough, becoming rough.
Isolated showers.
.TUESDAY...Northwest winds 15 to 20 knots, becoming northwest to
north and decreasing near 15 knots. Seas 3 to 5 feet, occasionally
to 6 feet, subsiding to 2 to 4 feet, occasionally 5 feet. West of
the Marquesas Keys, seas 5 to 7 feet, occasionally to 9 feet,
subsiding to 4 to 5 feet, occasionally to 6 feet. Nearshore waters
choppy, becoming a moderate chop.
.TUESDAY NIGHT...Northwest to north winds 10 to 15 knots, becoming
north to northeast and decreasing to 5 to 10 knots. Seas
around 2 feet, subsiding to around 1 foot. West of the Marquesas
Keys, seas 2 to 4 feet, occasionally to 5 feet, subsiding to 2 to
3 feet. Nearshore waters a light to moderate chop, becoming smooth
to a light chop.
.WEDNESDAY...Northeast to east winds near 10 knots. Seas 1 to
2 feet, except 2 to 3 feet west of the Marquesas Keys. Nearshore
waters a light chop.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...East to southeast winds
near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop.
.FRIDAY...East to southeast winds 10 to 15 knots. Seas 1 to
2 feet. Nearshore waters a light to moderate chop.
.FRIDAY NIGHT...East to southeast winds near 15 knots, increasing
to 15 to 20 knots. Seas 1 to 2 feet, except building to 3 to 4
feet west of the Marquesas Keys. Nearshore waters a moderate chop,
becoming choppy.


$$

GMZ042>044-100245-
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-
433 PM EDT Sun Mar 9 2025

.TONIGHT...Variable winds near 5 knots, becoming south and
increasing to 10 to 15 knots. Seas 1 to 2 feet, building to
around 2 feet. Nearshore waters smooth, becoming a light to
moderate chop. Isolated showers.
.MONDAY...South to southwest winds 10 to 15 knots, becoming
southwest to west and increasing to near 20 knots in the
afternoon. Seas 2 to 3 feet, except building to 3 to 4 feet,
occasionally to 6 feet west of Cosgrove Shoal Light. Nearshore
waters a light to moderate chop, becoming rough. Scattered showers
and isolated thunderstorms.
.MONDAY NIGHT...Northwest winds 20 to 25 knots, decreasing to near
20 knots. Seas 2 to 3 feet, except building to 4 to 6 feet,
occasionally to 8 feet west of Cosgrove Shoal Light. Nearshore
waters very rough, becoming rough. Isolated showers.
.TUESDAY...Northwest winds 15 to 20 knots, becoming northwest to
north and decreasing near 15 knots. Seas 2 to 3 feet, subsiding
to around 2 feet. West of Cosgrove Shoal Light, seas 4 to 6 feet,
occasionally to 8 feet, subsiding to 4 to 5 feet, occasionally to
6 feet. Nearshore waters choppy, becoming a moderate chop.
.TUESDAY NIGHT...Northwest to north winds 10 to 15 knots, becoming
north to northeast and decreasing to 5 to 10 knots. Seas 1 to 2
feet, except 3 to 4 feet, occasionally to 5 feet subsiding to 2 to
3 feet west of Cosgrove Shoal Light. Nearshore waters a light to
moderate chop, becoming smooth to a light chop.
.WEDNESDAY...Northeast to east winds near 10 knots. Seas 1 to
2 feet, except 2 to 3 feet west of Cosgrove Shoal Light.
Nearshore waters a light chop.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 1
to 2 feet, except around 2 feet west of Cosgrove Shoal Light.
Nearshore waters a light to moderate chop.
.THURSDAY...East to southeast winds near 10 knots. Seas 1
to 2 feet, except around 2 feet west of Cosgrove Shoal Light.
Nearshore waters a light chop.
.THURSDAY NIGHT...East to southeast winds 5 to 10 knots. Seas 1
to 2 feet. Nearshore waters smooth to a light chop.
.FRIDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet. Nearshore waters a light to moderate chop.
.FRIDAY NIGHT...East to southeast winds near 15 knots, increasing
to 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet.
Nearshore waters a moderate chop, becoming choppy.

$$

GMZ052>055-072>075-100245-
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-
433 PM EDT Sun Mar 9 2025

.TONIGHT...East to southeast winds 5 to 10 knots, becoming south
and increasing to 10 to 15 knots. Seas 1 to 2 feet, building to 2
to 3 feet. Wave Detail: Southeast to south 2 feet at 4 seconds.
Isolated showers.
.MONDAY...South to southwest winds near 15 knots, becoming west to
northwest and increasing to near 20 knots. Seas 2 to 3 feet,
building to 3 to 4 feet, occasionally to 6 feet. Wave Detail:
Southwest 3 feet at 4 seconds. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...Northwest winds 20 to 25 knots. Seas 3 to 5 feet,
occasionally to 6 feet, building to 5 to 7 feet, occasionally to
9 feet after midnight. Wave Detail: West to northwest 4 feet at 5
seconds, becoming northwest 6 feet at 6 seconds. Isolated showers.
.TUESDAY...Northwest to north winds 15 to 20 knots, decreasing to
10 to 15 knots. Seas 5 to 7 feet, occasionally to 9 feet,
subsiding to 4 to 6 feet, occasionally to 7 feet.
.TUESDAY NIGHT...North to northeast winds 10 to 15 knots. Seas
3 to 5 feet, occasionally to 6 feet.
.WEDNESDAY...Northeast to east winds near 10 knots. Seas 3 to
4 feet, occasionally to 5 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.THURSDAY...East to southeast winds 10 to 15 knots. Seas 2 to
3 feet.
.THURSDAY NIGHT...East winds near 10 knots. Seas 2 to 3 feet.
.FRIDAY...East to southeast winds 10 to 15 knots. Seas 2 to
4 feet, occasionally to 5 feet.
.FRIDAY NIGHT...East to southeast winds near 15 knots, increasing
to 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet.

$$

GMZ033-034-100245-
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-
433 PM EDT Sun Mar 9 2025

.TONIGHT...Variable winds near 5 knots, becoming south to
southwest and increasing to 10 to 15 knots. Seas 1 to 2 feet,
building to around 2 feet. Wave Detail: South to southwest 2 feet
at 5 seconds. Isolated showers.
.MONDAY...South to southwest winds near 15 knots, becoming west to
northwest near 20 knots in the afternoon. Seas 2 to 3 feet,
building to 3 to 5 feet, occasionally to 6 feet in the afternoon.
Wave Detail: South to southwest 3 feet at 4 seconds, becoming
west 5 feet at 5 seconds. Numerous showers and isolated
thunderstorms.
.MONDAY NIGHT...Northwest winds 20 to 25 knots, decreasing to near
20 knots. Seas 5 to 8 feet, occasionally to 10 feet. Wave Detail:
Northwest 8 feet at 9 seconds.
.TUESDAY...Northwest to north winds near 20 knots, becoming north
and decreasing to near 15 knots. Seas 5 to 8 feet, occasionally
to 10 feet, subsiding to 4 to 6 feet.
.TUESDAY NIGHT...North winds 10 to 15 knots, becoming north to
northeast and decreasing to near 10 knots. Seas 3 to 5 feet,
occasionally to 6 feet.
.WEDNESDAY...Northeast to east winds near 10 knots. Seas 2 to 3
feet.
.WEDNESDAY NIGHT...East to southeast winds 5 to 10 knots,
increasing to 10 to 15 knots. Seas 1 to 3 feet.
.THURSDAY...Southeast winds near 10 knots. Seas 1 to 2 feet.
.THURSDAY NIGHT...East winds near 10 knots. Seas 1 to 2 feet.
.FRIDAY...East to southeast winds 10 to 15 knots. Seas 1 to
3 feet.
.FRIDAY NIGHT...East to southeast winds 10 to 15 knots, becoming
15 to 20 knots. Seas 2 to 3 feet, building to 3 to 4 feet,
occasionally to 5 feet.

$$

AJP