GMZ005-212045-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
440 AM EDT Tue Jul 21 2026
.SYNOPSIS...As of 5 AM EDT, Tropical Storm Bertha was centered
over the northeastern Gulf waters. Bertha is expected to continue
moving slowly to the northwest or west-northwest today, followed
by a turn to the west by the middle part of the week. On the
forecast track, TS Bertha will move near or along the northern
Gulf coast during the next several days. Closer to home, an
Atlantic ridge of high pressure will extend to the Florida
Peninsula for the next several days. Moderate breezes will slacken
to mainly gentle this afternoon. Thereafter, breezes will
continue to peak overnight and lull during the day through Friday.
The Approximate Shoreward Edge of the Gulf Stream as of July 17,
2026...
49 NM South of Dry Tortugas Light...on Loggerhead Key.
51 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
38 NM South of Sand Key Light...off Key West.
22 NM South of Looe Key...off Big Pine Key.
13 NM South of Sombrero Key Light...off Marathon.
6 NM Southeast of Alligator Reef Light...off Islamorada.
2 NM Southeast of Molasses Reef Light...off Key Largo.
1 NM Southeast of Carysfort Reef Light...off Ocean Reef.
Gulf Stream Information Courtesy of the National Weather Service in
Key West, using data from RTOFS and NASA SPoRT SST.
$$
GMZ052>055-072>075-212045-
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 Tue Jul 21 2026
TODAY
Southeast winds near 15 knots, becoming east to
southeast and decreasing to near 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet, subsiding to 2 to 3 feet. Wave Detail:
East to southeast 3 feet at 5 seconds and west 2 feet at 6
seconds.
TONIGHT
East to southeast winds 10 to 15 knots, increasing to
near 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: East to southeast 3 feet at 5 seconds and west 2 feet at 6
seconds. A slight chance of showers and thunderstorms.
WEDNESDAY
East to southeast winds near 15 knots, decreasing to
10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave
Detail: East to southeast 3 feet at 5 seconds and west 2 feet at 7
seconds. A slight chance of showers and thunderstorms.
WEDNESDAY NIGHT
East winds 10 to 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet. A slight chance of showers and
thunderstorms.
THURSDAY
East winds near 10 knots. Seas 2 to 3 feet. A slight
chance of showers and thunderstorms.
THURSDAY NIGHT
East winds 10 to 15 knots. Seas 2 to 3 feet. A
chance of showers and thunderstorms.
FRIDAY
East winds near 10 knots, decreasing to 5 to 10 knots.
Seas 2 to 3 feet, subsiding to 1 to 2 feet. A chance of showers
and thunderstorms.
FRIDAY NIGHT
East to southeast winds 5 to 10 knots. Seas 1 to
2 feet. A slight chance of showers and thunderstorms.
SATURDAY
Southeast winds 5 to 10 knots. Seas 1 to 2 feet.
SATURDAY NIGHT
East to southeast winds near 5 knots. Seas
around 1 foot.
$$
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