240
FZUS52 KKEY 180826
CWFKEY
COASTAL WATERS FORECAST FOR THE FLORIDA KEYS
NATIONAL WEATHER SERVICE KEY WEST FL
426 AM EDT SUN OCT 18 2026
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.
THE WAVE DETAIL SECTION HIGHLIGHTS THE PERIOD AND DIRECTION OF
ORIGIN FOR THE HIGHEST-ENERGY WAVES, AS WELL AS ANY LONG-PERIOD
SWELLS MOVING IN A DIFFERENT DIRECTION THAN THE WIND.
GMZ005-182030-
SYNOPSIS FOR KEYS COASTAL WATERS FROM OCEAN REEF TO DRY TORTUGAS
426 AM EDT SUN OCT 18 2026
SYNOPSIS
A COLD FRONT IS SLOWLY MOVING SOUTHEAST ACROSS THE FLORIDA KEYS
WATERS. BREEZES FRESHENED RAPIDLY TO FRESH TO STRONG BREEZES OVER
THE GULFSIDE WATERS BEFORE SUNRISE. SQUALLY CONDITIONS ARE
POSSIBLE THROUGH THIS AFTERNOON. A SMALL CRAFT ADVISORY IS THUS IN
EFFECT FOR ALL THE FLORIDA KEYS WATERS. THE COLD FRONT IS EXPECTED
TO STALL SOMEWHERE OVER THE STRAITS OF FLORIDA EARLY THIS WEEK.
EXPECT FRESH TO STRONG NORTHEASTERLY BREEZES TO PREVAIL THROUGH
THE FIRST HALF OF THE WEEK. SHOWER CHANCES WILL GRADUALLY DECREASE
TONIGHT AND MONDAY.
THE APPROXIMATE SHOREWARD EDGE OF THE GULF STREAM AS OF OCTOBER 14, 2026...
7 NM SOUTH OF DRY TORTUGAS LIGHT, ON LOGGERHEAD KEY
4 NM NORTH OF COSGROVE SHOAL LIGHT, OFF THE MARQUESAS KEYS
3 NM NORTH OF SAND KEY LIGHT, OFF KEY WEST
0 NM NORTH-NORTHWEST OF LOOE KEY, OFF BIG PINE KEY
1 NM SOUTHEAST OF SOMBRERO KEY LIGHT, OFF MARATHON
1 NM SOUTH-SOUTHEAST OF ALLIGATOR REEF LIGHT, OFF ISLAMORADA
2 NM NORTHWEST OF MOLASSES REEF LIGHT, OFF KEY LARGO
2 NM NORTHWEST OF CARYSFORT REEF LIGHT, OFF OCEAN REEF
GULF STREAM INFORMATION COURTESY OF THE NAVAL OCEANOGRAPHIC OFFICE.
GMZ031-182030-
FLORIDA BAY INCLUDING BARNES SOUND, BLACKWATER SOUND, AND
BUTTONWOOD SOUND-
426 AM EDT SUN OCT 18 2026
..SMALL CRAFT ADVISORY IN EFFECT
TODAY
NORTHEAST WINDS NEAR 20 KNOTS, INCREASING TO 20 TO 25
KNOTS. BAY WATERS ROUGH, BECOMING VERY ROUGH. SHOWERS LIKELY WITH
A SLIGHT CHANCE OF THUNDERSTORMS.
TONIGHT
NORTHEAST WINDS 20 TO 25 KNOTS. BAY WATERS VERY ROUGH.
A CHANCE OF SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS.
MONDAY
NORTHEAST WINDS NEAR 20 KNOTS. BAY WATERS ROUGH. A
CHANCE OF SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS.
MONDAY NIGHT
NORTHEAST WINDS 20 TO 25 KNOTS, DECREASING TO NEAR
20 KNOTS. BAY WATERS VERY ROUGH, BECOMING ROUGH. A SLIGHT CHANCE
OF SHOWERS.
TUESDAY
NORTHEAST WINDS NEAR 20 KNOTS. BAY WATERS ROUGH.
TUESDAY NIGHT
NORTHEAST WINDS NEAR 20 KNOTS, DECREASING TO 15
TO 20 KNOTS. BAY WATERS ROUGH, BECOMING CHOPPY.
WEDNESDAY
NORTH TO NORTHEAST WINDS 15 TO 20 KNOTS. BAY WATERS
CHOPPY. A SLIGHT CHANCE OF SHOWERS.
WEDNESDAY NIGHT
NORTH TO NORTHEAST WINDS NEAR 15 KNOTS. BAY
WATERS A MODERATE CHOP. A SLIGHT CHANCE OF SHOWERS.
THURSDAY
NORTH TO NORTHEAST WINDS 10 TO 15 KNOTS. BAY WATERS A
LIGHT TO MODERATE CHOP. A SLIGHT CHANCE OF SHOWERS.
THURSDAY NIGHT
NORTH TO NORTHEAST WINDS 10 TO 15 KNOTS. BAY
WATERS A LIGHT TO MODERATE CHOP. A SLIGHT CHANCE OF SHOWERS.
GMZ032-035-182030-
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-
426 AM EDT SUN OCT 18 2026
..SMALL CRAFT ADVISORY IN EFFECT
TODAY
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 3 TO 5 FEET,
OCCASIONALLY TO 6 FEET, EXCEPT 6 TO 7 FEET, OCCASIONALLY TO
9 FEET WEST OF THE MARQUESAS KEYS. NEARSHORE WATERS VERY ROUGH.
SHOWERS LIKELY WITH A SLIGHT CHANCE OF THUNDERSTORMS.
TONIGHT
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 3 TO 5 FEET,
OCCASIONALLY TO 6 FEET, EXCEPT 6 TO 7 FEET, OCCASIONALLY TO
9 FEET WEST OF THE MARQUESAS KEYS. NEARSHORE WATERS VERY ROUGH. A
CHANCE OF SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS.
MONDAY
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 3 TO 5 FEET,
OCCASIONALLY TO 6 FEET, EXCEPT 5 TO 7 FEET, OCCASIONALLY TO
9 FEET WEST OF THE MARQUESAS KEYS. NEARSHORE WATERS VERY ROUGH. A
CHANCE OF SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS.
MONDAY NIGHT
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 3 TO 5 FEET,
OCCASIONALLY TO 6 FEET, EXCEPT 5 TO 6 FEET, OCCASIONALLY TO
8 FEET WEST OF THE MARQUESAS KEYS. NEARSHORE WATERS VERY ROUGH. A
SLIGHT CHANCE OF SHOWERS.
TUESDAY
NORTHEAST WINDS 20 TO 25 KNOTS, DECREASING TO NEAR 20
KNOTS. SEAS 3 TO 5 FEET, OCCASIONALLY TO 6 FEET, EXCEPT 5 TO 7
FEET, OCCASIONALLY TO 9 FEET WEST OF THE MARQUESAS KEYS. NEARSHORE
WATERS VERY ROUGH, BECOMING ROUGH. A SLIGHT CHANCE OF SHOWERS.
TUESDAY NIGHT
NORTHEAST 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. A
SLIGHT CHANCE OF SHOWERS.
WEDNESDAY
NORTH TO NORTHEAST WINDS 15 TO 20 KNOTS, BECOMING
NORTHEAST 10 TO 15 KNOTS. SEAS 2 TO 4 FEET, OCCASIONALLY TO 5
FEET. WEST OF THE MARQUESAS KEYS, SEAS 4 TO 6 FEET, OCCASIONALLY
TO 8 FEET, SUBSIDING TO 2 TO 4 FEET. NEARSHORE WATERS CHOPPY,
BECOMING A LIGHT TO MODERATE CHOP. A SLIGHT CHANCE OF SHOWERS.
WEDNESDAY NIGHT
NORTHEAST WINDS 15 TO 20 KNOTS. SEAS 2 TO
3 FEET. NEARSHORE WATERS CHOPPY. A SLIGHT CHANCE OF SHOWERS.
THURSDAY
NORTHEAST WINDS 15 TO 20 KNOTS, DECREASING TO 10 TO
15 KNOTS. SEAS 2 TO 4 FEET, OCCASIONALLY TO 5 FEET. NEARSHORE
WATERS CHOPPY, BECOMING LIGHT TO MODERATE CHOP. A SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS.
THURSDAY NIGHT
NORTHEAST WINDS 10 TO 15 KNOTS, INCREASING TO
NEAR 15 KNOTS. SEAS 2 TO 3 FEET. NEARSHORE WATERS A LIGHT TO
MODERATE CHOP. A SLIGHT CHANCE OF SHOWERS.
GMZ042>044-182030-
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-
426 AM EDT SUN OCT 18 2026
..SMALL CRAFT ADVISORY IN EFFECT
TODAY
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 2 TO 4 FEET,
OCCASIONALLY TO 5 FEET, EXCEPT 5 TO 6 FEET, OCCASIONALLY TO
8 FEET WEST OF COSGROVE SHOAL LIGHT. NEARSHORE WATERS VERY ROUGH.
SHOWERS LIKELY WITH A SLIGHT CHANCE OF THUNDERSTORMS.
TONIGHT
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 3 TO 5 FEET,
OCCASIONALLY TO 6 FEET, EXCEPT 5 TO 7 FEET, OCCASIONALLY TO
9 FEET WEST OF COSGROVE SHOAL LIGHT. NEARSHORE WATERS VERY ROUGH.
A CHANCE OF SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS.
MONDAY
NORTHEAST TO EAST WINDS 20 TO 25 KNOTS. SEAS 3 TO
5 FEET, OCCASIONALLY TO 6 FEET, EXCEPT 5 TO 7 FEET, OCCASIONALLY
TO 9 FEET WEST OF COSGROVE SHOAL LIGHT. NEARSHORE WATERS VERY
ROUGH. A CHANCE OF SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS.
MONDAY NIGHT
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 3 TO 5 FEET,
OCCASIONALLY TO 6 FEET, EXCEPT 4 TO 6 FEET, OCCASIONALLY TO
8 FEET WEST OF COSGROVE SHOAL LIGHT. NEARSHORE WATERS VERY ROUGH.
A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.
TUESDAY
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 3 TO 5 FEET,
OCCASIONALLY TO 6 FEET, EXCEPT 4 TO 6 FEET, OCCASIONALLY TO
8 FEET WEST OF COSGROVE SHOAL LIGHT. NEARSHORE WATERS VERY ROUGH.
A SLIGHT CHANCE OF SHOWERS.
TUESDAY NIGHT
NORTHEAST WINDS 20 TO 25 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 VERY ROUGH. A
SLIGHT CHANCE OF SHOWERS.
WEDNESDAY
NORTHEAST WINDS 20 TO 25 KNOTS, DECREASING TO 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 VERY ROUGH, BECOMING CHOPPY. A SLIGHT CHANCE OF
SHOWERS.
WEDNESDAY NIGHT
NORTHEAST WINDS 15 TO 20 KNOTS. SEAS 2 TO
3 FEET. NEARSHORE WATERS CHOPPY. A SLIGHT CHANCE OF SHOWERS.
THURSDAY
NORTH TO NORTHEAST WINDS 15 TO 20 KNOTS, BECOMING NORTHEAST
10 TO 15 KNOTS. SEAS 2 TO 4 FEET, OCCASIONALLY TO 5 FEET.
NEARSHORE WATERS CHOPPY, BECOMING A LIGHT TO MODERATE CHOP. A
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.
THURSDAY NIGHT
NORTHEAST WINDS 10 TO 15 KNOTS. SEAS 2 TO
3 FEET. NEARSHORE WATERS A LIGHT TO MODERATE CHOP. A CHANCE OF
SHOWERS.
GMZ052>055-072>075-182030-
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-
426 AM EDT SUN OCT 18 2026
..SMALL CRAFT ADVISORY IN EFFECT
TODAY
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 5 TO 7 FEET,
OCCASIONALLY TO 9 FEET, EXCEPT BUILDING TO 7 TO 9 FEET,
OCCASIONALLY TO 11 FEET EASTERN STRAITS. WAVE DETAIL: NORTHEAST 6
FEET AT 6 SECONDS AND NORTHWEST 3 FEET AT 8 SECONDS. SHOWERS WITH
A SLIGHT CHANCE OF THUNDERSTORMS.
TONIGHT
NORTHEAST TO EAST WINDS 20 TO 25 KNOTS. SEAS 6 TO
9 FEET, OCCASIONALLY TO 11 FEET, EXCEPT 8 TO 10 FEET, OCCASIONALLY
TO 13 FEET EASTERN STRAITS. WAVE DETAIL: NORTHEAST 8 FEET AT
7 SECONDS AND NORTHWEST 2 FEET AT 8 SECONDS. SHOWERS LIKELY WITH
A SLIGHT CHANCE OF THUNDERSTORMS.
MONDAY
NORTHEAST TO EAST WINDS 20 TO 25 KNOTS. SEAS 6 TO
8 FEET, OCCASIONALLY TO 10 FEET, EXCEPT 7 TO 9 FEET, OCCASIONALLY
TO 11 FEET IN THE EASTERN STRAITS. WAVE DETAIL: NORTHEAST TO EAST
8 FEET AT 7 SECONDS. SHOWERS WITH A SLIGHT CHANCE
OF THUNDERSTORMS.
MONDAY NIGHT
NORTHEAST TO EAST WINDS 20 TO 25 KNOTS. SEAS 6 TO
8 FEET, OCCASIONALLY TO 10 FEET, EXCEPT 7 TO 9 FEET, OCCASIONALLY
TO 11 FEET IN THE EASTERN STRAITS. A CHANCE OF SHOWERS WITH A
SLIGHT CHANCE OF THUNDERSTORMS.
TUESDAY
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 6 TO
8 FEET, OCCASIONALLY TO 10 FEET, EXCEPT 7 TO 9 FEET,
OCCASIONALLY TO 11 FEET IN THE EASTERN STRAITS. A CHANCE OF
SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS.
TUESDAY NIGHT
NORTHEAST WINDS NEAR 20 KNOTS. SEAS 5 TO 7 FEET,
OCCASIONALLY TO 9 FEET. A CHANCE OF SHOWERS WITH A SLIGHT CHANCE
OF THUNDERSTORMS.
WEDNESDAY
NORTHEAST WINDS NEAR 20 KNOTS, DECREASING TO 15 TO
20 KNOTS. SEAS 5 TO 7 FEET, OCCASIONALLY TO 9 FEET, SUBSIDING TO 3
TO 5 FEET, OCCASIONALLY TO 6 FEET. A CHANCE OF SHOWERS.
WEDNESDAY NIGHT
NORTHEAST WINDS 15 TO 20 KNOTS. SEAS 3 TO
5 FEET, OCCASIONALLY TO 6 FEET. A CHANCE OF SHOWERS WITH A SLIGHT
CHANCE OF THUNDERSTORMS.
THURSDAY
NORTHEAST WINDS 15 TO 20 KNOTS, DECREASING TO 10 TO 15
KNOTS. SEAS 3 TO 5 FEET, OCCASIONALLY TO 6 FEET. A CHANCE OF
SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS.
THURSDAY NIGHT
NORTHEAST WINDS 10 TO 15 KNOTS. SEAS 3 TO
5 FEET, OCCASIONALLY TO 6 FEET. A CHANCE OF SHOWERS.
GMZ033-034-182030-
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-
426 AM EDT SUN OCT 18 2026
..SMALL CRAFT ADVISORY IN EFFECT
TODAY
NORTHEAST WINDS NEAR 25 KNOTS, INCREASING TO 25 TO 30
KNOTS. SEAS 5 TO 8 FEET, OCCASIONALLY TO 10 FEET. WAVE DETAIL:
NORTH 6 FEET AT 7 SECONDS. A CHANCE OF SHOWERS WITH A SLIGHT
CHANCE OF THUNDERSTORMS.
TONIGHT
NORTHEAST WINDS 25 TO 30 KNOTS, DECREASING TO NEAR 25
KNOTS. SEAS 5 TO 8 FEET, OCCASIONALLY TO 10 FEET. WAVE DETAIL:
NORTHEAST 8 FEET AT 7 SECONDS. A CHANCE OF SHOWERS WITH A SLIGHT
CHANCE OF THUNDERSTORMS.
MONDAY
NORTHEAST WINDS NEAR 25 KNOTS, DECREASING TO 20 TO 25
KNOTS. SEAS 5 TO 8 FEET, OCCASIONALLY TO 10 FEET. WAVE DETAIL:
NORTH TO NORTHEAST 8 FEET AT 6 SECONDS. A CHANCE OF SHOWERS WITH A
SLIGHT CHANCE OF THUNDERSTORMS.
MONDAY NIGHT
NORTHEAST WINDS 20 TO 25 KNOTS. SEAS 5 TO 7 FEET,
OCCASIONALLY TO 9 FEET.
TUESDAY
NORTHEAST WINDS 20 TO 25 KNOTS, DECREASING TO NEAR 20
KNOTS. SEAS 5 TO 7 FEET, OCCASIONALLY TO 9 FEET.
TUESDAY NIGHT
NORTHEAST WINDS NEAR 20 KNOTS. SEAS 4 TO 5 FEET,
OCCASIONALLY TO 6 FEET. A SLIGHT CHANCE OF SHOWERS.
WEDNESDAY
NORTHEAST WINDS NEAR 20 KNOTS, BECOMING NORTH TO
NORTHEAST NEAR 15 KNOTS. SEAS 4 TO 5 FEET, OCCASIONALLY TO 6
FEET, SUBSIDING TO 2 TO 4 FEET, OCCASIONALLY TO 5 FEET.
WEDNESDAY NIGHT
NORTHEAST WINDS 15 TO 20 KNOTS. SEAS 2 TO
4 FEET, OCCASIONALLY TO 5 FEET. A SLIGHT CHANCE OF SHOWERS.
THURSDAY
NORTHEAST WINDS 15 TO 20 KNOTS, BECOMING NORTH TO
NORTHEAST 10 TO 15 KNOTS. SEAS 2 TO 4 FEET, OCCASIONALLY TO 5
FEET. A SLIGHT CHANCE OF SHOWERS.
THURSDAY NIGHT
NORTH TO NORTHEAST WINDS NEAR 15 KNOTS. SEAS 2
TO 3 FEET. A SLIGHT CHANCE OF SHOWERS.
DM/AJP
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