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.
 
 $$




 
 GMZ031-212045-
 Florida Bay including Barnes Sound, Blackwater Sound, and
 Buttonwood Sound-
 440 AM EDT Tue Jul 21 2026
 

 TODAY
 Southeast to south winds near 15 knots, becoming
 southeast and decreasing to near 10 knots this afternoon. Bay
 waters a moderate chop, becoming a light chop.

 TONIGHT
 East to southeast winds near 10 knots, becoming
 southeast and increasing to 10 to 15 knots. Bay waters a light
 chop, becoming a light to moderate chop. A slight chance of
 showers and thunderstorms.

 WEDNESDAY
 Southeast winds 10 to 15 knots, becoming east to
 southeast and decreasing to near 10 knots. Bay waters a light to
 moderate chop, becoming a light chop. A slight chance of showers
 and thunderstorms.

 WEDNESDAY NIGHT
 East winds near 10 knots, increasing to 10 to
 15 knots. Bay waters a light chop, becoming a light to moderate
 chop. A slight chance of showers and thunderstorms.

 THURSDAY
 East winds near 10 knots. Bay waters a light chop. A
 slight chance of showers and thunderstorms.

 THURSDAY NIGHT
 East winds 10 to 15 knots. Bay waters a light
 to moderate chop. A chance of showers and thunderstorms.

 FRIDAY
 East to southeast winds 5 to 10 knots. Bay waters
 smooth to a light chop. A chance of showers and thunderstorms.

 FRIDAY NIGHT
 East to southeast winds 5 to 10 knots. Bay waters
 smooth to a light chop. A slight chance of showers.

 SATURDAY
 Southeast to south winds near 5 knots. Bay waters
 smooth. A slight chance of showers and thunderstorms.

 SATURDAY NIGHT
 Southeast to south winds near 5 knots. Bay
 waters smooth.
 
 $$