Coastal Waters Forecast
Issued by NWS

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062
FZUS52 KKEY 201426
CWFKEY

Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1026 AM EDT Sun Aug 20 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.

GMZ005-202030-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1026 AM EDT Sun Aug 20 2017

.SYNOPSIS...A tropical wave over our area will move into the
southeast Gulf of Mexico late this afternoon and tonight. High
pressure from the Atlantic will build across the Florida peninsula
before another weak tropical wave approaches our area late Monday
and Tuesday.

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

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

$$

GMZ031-202030-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1026 AM EDT Sun Aug 20 2017

.THIS AFTERNOON...East to southeast winds near 10 knots,
increasing to 10 to 15 knots. Bay waters a light chop, becoming a
light to moderate chop. Scattered showers and isolated
thunderstorms.
.TONIGHT...East winds increasing to 15 to 20 knots. Bay waters
becoming choppy. Scattered showers and isolated thunderstorms.
.MONDAY...East winds 15 to 20 knots. Bay waters choppy. Isolated
showers.
.MONDAY NIGHT...East winds 15 to 20 knots, decreasing to near 15
knots after midnight. Bay waters choppy, becoming a moderate chop.
Scattered showers and isolated thunderstorms.
.TUESDAY...East to southeast winds near 10 knots. Bay waters
a light chop. Scattered showers and isolated thunderstorms.
.TUESDAY NIGHT AND WEDNESDAY...Southeast winds near 10 knots. Bay
waters a light chop. Scattered showers and isolated thunderstorms.
.WEDNESDAY NIGHT...Southeast to south winds 10 to 15 knots. Bay
waters a light to moderate chop. Scattered showers and isolated
thunderstorms.
.THURSDAY...South winds near 10 knots. Bay waters a light chop.
Scattered showers and isolated thunderstorms.
.THURSDAY NIGHT...South winds 5 to 10 knots. Bay waters smooth to
a light chop. Scattered showers and isolated thunderstorms.

$$

GMZ032-035-202030-
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-
1026 AM EDT Sun Aug 20 2017

.THIS AFTERNOON...East to southeast winds 10 to 15 knots.
Seas building to 1 to 3 feet. Nearshore waters a light to moderate
chop. Scattered showers and isolated thunderstorms.
.TONIGHT...East to southeast winds increasing to 15 to 20 knots.
Seas building to 2 to 4 feet. Nearshore waters becoming choppy.
Scattered showers and isolated thunderstorms.
.MONDAY...East winds near 15 knots. Seas 1 to 3 feet. Nearshore
waters a moderate chop. Isolated showers.
.MONDAY NIGHT...East winds 15 to 20 knots. Seas 2 to 4 feet.
Nearshore waters choppy. Scattered showers and isolated
thunderstorms.
.TUESDAY...East winds near 10 knots. Seas around 1 foot.
Nearshore waters a light chop. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 10 knots. Seas
around 1 foot. Nearshore waters a light chop. Scattered showers
and isolated thunderstorms.
.WEDNESDAY AND WEDNESDAY NIGHT...Southeast to south winds near 10
knots. Seas around 1 foot. Nearshore waters a light chop.
Scattered showers and isolated thunderstorms.
.THURSDAY AND THURSDAY NIGHT...South to southwest winds 5 to 10
knots. Seas 1 foot or less. Nearshore waters smooth to a light
chop. Scattered showers and isolated thunderstorms.

$$

GMZ042>044-202030-
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-
1026 AM EDT Sun Aug 20 2017

.THIS AFTERNOON...East to southeast winds near 10 knots,
increasing to near 15 knots. Seas 1 to 2 feet, building to 2 to 3
feet. Nearshore waters a light chop, becoming a moderate chop.
Scattered showers and isolated thunderstorms.
.TONIGHT...East to southeast winds 15 to 20 knots with gusts to
near 25 knots. Seas 3 to 4 feet. Nearshore waters choppy.
Scattered showers and isolated thunderstorms.
.MONDAY...East winds near 15 knots. Seas 2 to 3 feet. Nearshore
waters a moderate chop. Scattered showers and isolated
thunderstorms.
.MONDAY NIGHT...East winds 15 to 20 knots, decreasing to near 15
knots. Seas 2 to 4 feet. Nearshore waters choppy, becoming a
moderate chop. Scattered showers and isolated thunderstorms.
.TUESDAY...East winds near 10 knots. Seas 1 to 3 feet. Nearshore
waters a light chop. Scattered showers and isolated
thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 10 knots. Seas 1 to
2 feet. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.WEDNESDAY...Southeast winds 10 to 15 knots. Seas 1 to 3 feet.
Nearshore waters a light to moderate chop. Scattered showers and
isolated thunderstorms.
.WEDNESDAY NIGHT...Southeast to south winds near 15 knots. Seas 2
to 3 feet. Nearshore waters a moderate chop. Scattered showers
and isolated thunderstorms.
.THURSDAY...South to southwest winds near 10 knots. Seas 1 to 2
feet. Nearshore waters a light chop. Scattered showers and
isolated thunderstorms.
.THURSDAY NIGHT...South winds near 10 knots. Seas 1 to 2 feet.
Nearshore waters a light chop. Scattered showers and isolated
thunderstorms.

$$

GMZ052>055-072>075-202030-
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-
1026 AM EDT Sun Aug 20 2017

...A SMALL CRAFT ADVISORY WILL LIKELY BE REQUIRED TONIGHT...

.THIS AFTERNOON...East to southeast winds 10 to 15 knots,
increasing to near 15 knots. Seas 2 to 4 feet, building to 3 to 5
feet. Scattered showers and isolated thunderstorms.
.TONIGHT...East to southeast winds 15 to 20 knots, increasing to
near 20 knots. Seas 3 to 5 feet, building to 4 to 7 feet after
midnight. Scattered showers and isolated thunderstorms.
.MONDAY...East winds near 20 knots, decreasing to 15 to 20 knots.
Seas 5 to 7 feet, subsiding to 4 to 6 feet. Scattered showers and
isolated thunderstorms.
.MONDAY NIGHT...East to southeast winds 15 to 20 knots, decreasing
to near 15 knots. Seas 4 to 6 feet, subsiding to 3 to 5 feet.
Scattered showers and isolated thunderstorms.
.TUESDAY...East winds 10 to 15 knots. Seas 2 to 4 feet. Scattered
showers and isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds 10 to 15 knots. Seas
2 to 4 feet. Scattered showers and isolated thunderstorms.
.WEDNESDAY...Southeast winds 10 to 15 knots. Seas 2 to 4 feet.
Scattered showers and isolated thunderstorms.
.WEDNESDAY NIGHT...South winds 10 to 15 knots. Seas 2 to 4 feet.
Scattered showers and isolated thunderstorms.
.THURSDAY AND THURSDAY NIGHT...South winds near 10 knots. Seas 2
to 3 feet. Scattered showers and isolated thunderstorms.

$$

GMZ033-034-202030-
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-
1026 AM EDT Sun Aug 20 2017

.THIS AFTERNOON...East winds near 10 knots, increasing to near 15
knots. Seas 1 to 3 feet, building to 2 to 4 feet. Scattered
showers and isolated thunderstorms.
.TONIGHT...East to southeast winds 15 to 20 knots. Seas 3 to 5
feet. Scattered showers and isolated thunderstorms.
.MONDAY...East to southeast winds 15 to 20 knots. Seas 3 to 5
feet. Isolated showers.
.MONDAY NIGHT...East winds 15 to 20 knots, decreasing to near 15
knots. Seas 3 to 5 feet, subsiding to 2 to 4 feet. Scattered
showers and isolated thunderstorms.
.TUESDAY...East winds near 15 knots, decreasing to near 10 knots.
Seas 2 to 4 feet, subsiding to around 2 feet. Scattered showers
and isolated thunderstorms.
.TUESDAY NIGHT...East to southeast winds near 10 knots. Seas
around 2 feet. Scattered showers and isolated thunderstorms.
.WEDNESDAY AND WEDNESDAY NIGHT...East to southeast winds near 10
knots. Seas around 2 feet. Scattered showers and isolated
thunderstorms.
.THURSDAY...Southwest winds near 10 knots. Seas around 2 feet.
Scattered showers and isolated thunderstorms.
.THURSDAY NIGHT...South winds 5 to 10 knots. Seas 1 foot or less.
Scattered showers and isolated thunderstorms.

$$

APA



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