Coastal Waters Forecast
Issued by NWS

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FZUS52 KKEY 210840
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
440 AM EDT Sat Oct 21 2017

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.

GMZ005-211430-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
440 AM EDT Sat Oct 21 2017

.SYNOPSIS...A large area of high pressure over the Mid-Atlantic
United States will move to the northeast this morning. This area
of high pressure will enter the northwest Atlantic waters later
today and extend across the southeastern United States tonight
through Monday night, before retreating eastward Tuesday. A cold
front may pass through the Florida Keys Tuesday night or
Wednesday.

The Approximate Shoreward Edge of the Gulf Stream current, as of
October 19th, 2017,

 4 NM South of Dry Tortugas Light...on Loggerhead Key.
 9 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
 6 NM South of Sand Key Light...off Key West.
Less than 1 NM South of Looe Key...off Big Pine Key.
 3 NM South of Sombrero Key Light...off Marathon.
 1 NM Southeast of Alligator Reef Light...off Islamorada.
 2 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 Naval Oceanographic
Office.

$$

GMZ031-211430-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
440 AM EDT Sat Oct 21 2017

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...East winds near 20 knots. Bay waters rough. Scattered
showers and isolated thunderstorms.
.TONIGHT AND SUNDAY...East to southeast winds 15 to 20 knots. Bay
waters choppy. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...East to southeast winds near 15 knots. Bay waters
a moderate chop. Scattered showers and isolated thunderstorms.
.MONDAY...Southeast winds 10 to 15 knots. Bay waters a light to
moderate chop. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...Southeast winds 10 to 15 knots. Bay waters a
light to moderate chop. Scattered showers and isolated
thunderstorms.
.TUESDAY...South to southwest winds 5 to 10 knots. Bay waters
smooth to a light chop. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...West to northwest winds 5 to 10 knots. Bay
waters smooth to a light chop. Scattered showers and isolated
thunderstorms.
.WEDNESDAY...North winds 10 to 15 knots. Bay waters a light to
moderate chop. Scattered showers and isolated thunderstorms.
.WEDNESDAY NIGHT...North winds near 15 knots. Bay waters a
moderate chop.

$$

GMZ032-035-211430-
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-
440 AM EDT Sat Oct 21 2017

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...East winds near 20 knots. Seas 2 to 3 feet. Nearshore
waters rough. Scattered showers and isolated thunderstorms.
.TONIGHT...East to southeast winds 15 to 20 knots. Seas around 2
feet. Nearshore waters choppy. Scattered showers and isolated
thunderstorms.
.SUNDAY...East to southeast winds 15 to 20 knots. Seas around 2
feet. Nearshore waters choppy. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...East to southeast winds near 15 knots. Seas 1 to
2 feet. Nearshore waters a moderate chop. Scattered showers and
isolated thunderstorms.
.MONDAY...Southeast winds 10 to 15 knots. Seas around 1 foot.
Nearshore waters a light to moderate chop. Scattered showers and
isolated thunderstorms.
.MONDAY NIGHT...Southeast to south winds 10 to 15 knots. Seas
around 1 foot. Nearshore waters a light to moderate chop.
Scattered showers and isolated thunderstorms.
.TUESDAY...Southwest winds 5 to 10 knots. Seas 1 foot or less.
Nearshore waters smooth to a light chop. Scattered showers and
isolated thunderstorms.
.TUESDAY NIGHT...West to northwest winds 5 to 10 knots, becoming
northwest and increasing to 10 to 15 knots after midnight. Seas
less than 1 foot, building to around 1 foot. Nearshore waters
smooth to a light chop, becoming a light to moderate chop.
Scattered showers and isolated thunderstorms.
.WEDNESDAY...Northwest winds 10 to 15 knots, becoming north and
increasing to 15 to 20 knots in the afternoon. Seas around 1
foot, building to 2 to 3 feet. Nearshore waters a light to
moderate chop, becoming choppy. Scattered showers and isolated
thunderstorms.
.WEDNESDAY NIGHT...North to northeast winds near 15 knots. Seas
2 to 3 feet. Nearshore waters a moderate chop.

$$

GMZ042>044-211430-
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-
440 AM EDT Sat Oct 21 2017

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...East winds near 20 knots. Seas 3 to 5 feet. Nearshore
waters rough. Scattered showers and isolated thunderstorms.
.TONIGHT...East to southeast winds near 20 knots. Seas 3 to
5 feet. Nearshore waters rough. Scattered showers and isolated
thunderstorms.
.SUNDAY...East to southeast winds 15 to 20 knots. Seas 2 to
4 feet. Nearshore waters choppy. Scattered showers and isolated
thunderstorms.
.SUNDAY NIGHT...East to southeast winds near 15 knots. Seas 2 to
3 feet. Nearshore waters a moderate chop. Scattered showers and
isolated thunderstorms.
.MONDAY...Southeast winds 10 to 15 knots. Seas around 2 feet.
Nearshore waters a light to moderate chop. Scattered showers and
isolated thunderstorms.
.MONDAY NIGHT...Southeast to south winds 10 to 15 knots. Seas
around 2 feet. Nearshore waters a light to moderate chop.
Scattered showers and isolated thunderstorms.
.TUESDAY...Southwest winds near 10 knots, becoming west in the
afternoon. Seas 1 to 2 feet. Nearshore waters a light chop.
Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT...West to northwest winds near 10 knots, becoming
northwest and increasing to 10 to 15 knots after midnight. Seas
around 2 feet. Nearshore waters a light to moderate chop.
Scattered showers and isolated thunderstorms.
.WEDNESDAY...Northwest winds 10 to 15 knots, becoming north and
increasing to near 20 knots in the afternoon. Seas around 2 feet,
building to 3 to 4 feet. Nearshore waters a light to moderate
chop, becoming rough. Scattered showers and isolated
thunderstorms.
.WEDNESDAY NIGHT...North to northeast winds near 15 knots. Seas
2 to 4 feet. Nearshore waters a moderate chop.

$$

GMZ052>055-072>075-211430-
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-
440 AM EDT Sat Oct 21 2017

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...East winds 20 to 25 knots. Seas 6 to 8 feet. Scattered
showers and isolated thunderstorms.
.TONIGHT...East to southeast winds near 20 knots. Seas 5 to 7
feet. Scattered showers and isolated thunderstorms.
.SUNDAY...East to southeast winds near 20 knots. Seas 5 to 7
feet. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...East to southeast winds 15 to 20 knots. Seas 4 to
6 feet. Scattered showers and isolated thunderstorms.
.MONDAY...Southeast winds 15 to 20 knots. Seas 4 to 6 feet.
Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...Southeast to south winds 10 to 15 knots. Seas
2 to 4 feet. Scattered showers and isolated thunderstorms.
.TUESDAY...South to southwest winds 10 to 15 knots, becoming west
in the afternoon. Seas 2 to 4 feet. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...West to northwest winds 10 to 15 knots, becoming
northwest after midnight. Seas 2 to 4 feet. Scattered showers and
isolated thunderstorms.
.WEDNESDAY...Northwest winds 10 to 15 knots, becoming north and
increasing to near 20 knots in the afternoon. Seas 2 to 4 feet,
building to 4 to 7 feet. Scattered showers and isolated
thunderstorms.
.WEDNESDAY NIGHT...North to northeast winds 15 to 20 knots. Seas
4 to 6 feet. Isolated showers.

$$

GMZ033-034-211430-
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-
440 AM EDT Sat Oct 21 2017

...SMALL CRAFT ADVISORY IN EFFECT...

.TODAY...East winds 20 to 25 knots. Seas 4 to 6 feet. Scattered
showers and isolated thunderstorms.
.TONIGHT...East to southeast winds near 20 knots. Seas 4 to
6 feet. Scattered showers and isolated thunderstorms.
.SUNDAY...East to southeast winds 15 to 20 knots. Seas 3 to
5 feet. Scattered showers and isolated thunderstorms.
.SUNDAY NIGHT...East to southeast winds near 15 knots. Seas 2 to
4 feet. Scattered showers and isolated thunderstorms.
.MONDAY...Southeast to south winds 10 to 15 knots. Seas 2 to 3
feet. Scattered showers and isolated thunderstorms.
.MONDAY NIGHT...Southeast to south winds 10 to 15 knots. Seas
2 to 3 feet. Scattered showers and isolated thunderstorms.
.TUESDAY...South to southwest winds near 10 knots, becoming west
in the afternoon. Seas around 2 feet. Scattered showers and
isolated thunderstorms.
.TUESDAY NIGHT...West to northwest winds near 10 knots, becoming
northwest and increasing to 10 to 15 knots after midnight. Seas
building to 2 to 3 feet. Scattered showers and isolated
thunderstorms.
.WEDNESDAY...Northwest winds 10 to 15 knots, becoming north and
increasing to near 20 knots by noon. Seas 2 to 4 feet, building to
4 to 6 feet. Scattered showers and isolated thunderstorms.
.WEDNESDAY NIGHT...North to northeast winds near 15 knots. Seas
4 to 7 feet subsiding to 3 to 5 feet after midnight.

$$

KN



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