GMZ005-310800-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
352 PM EDT Fri Oct 30 2026
.SYNOPSIS...
A high pressure system is developing over the eastern half of the
United States. The high will be able to support moderate to fresh
breezes across the Florida Keys waters this weekend, and Small
Craft Should Exercise Caution headlines may be required for all
the marine zones. While the pressure gradient will not be
sufficient to keep moderate to fresh breezes for the entire
weekend, northerly swell from the Atlantic Ocean will keep waves
elevated through the early part of the week. Shower chances will
peak Sunday through Monday. Drier conditions will set up mid week,
and breezes are on track to slacken to light to gentle.
The Approximate Shoreward Edge of the Gulf Stream as of October
27, 2026...
19 NM south of Dry Tortugas Light, on Loggerhead Key
34 NM south of Cosgrove Shoal Light, off the Marquesas Keys
28 NM south of Sand Key Light, off Key West
38 NM south of Looe Key, off Big Pine Key
31 NM southeast of Sombrero Key Light, off Marathon
17 NM south-southeast of Alligator Reef Light, off Islamorada
10 NM southeast of Molasses Reef Light, off Key Largo
10 NM northwest 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.
$$
GMZ031-310800- Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound- 352 PM EDT Fri Oct 30 2026 TONIGHT Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers and thunderstorms. SATURDAY Northeast to east winds near 15 knots. Bay waters a moderate chop. A chance of showers with a slight chance of thunderstorms. SATURDAY NIGHT Northeast to east winds 15 to 20 knots. Bay waters choppy. Showers likely with a slight chance of thunderstorms. SUNDAY Northeast to east winds near 15 knots. Bay waters a moderate chop. Showers likely with a chance of thunderstorms. SUNDAY NIGHT East winds 10 to 15 knots. Bay waters a light to moderate chop. Showers likely with a chance of thunderstorms. MONDAY East winds 10 to 15 knots. Bay waters a light to moderate chop. A chance of showers and thunderstorms. MONDAY NIGHT Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers and thunderstorms. TUESDAY Northeast winds near 10 knots, becoming east to southeast. Bay waters a light chop. A slight chance of showers. TUESDAY NIGHT East winds 5 to 10 knots. Bay waters smooth to a light chop. A slight chance of showers. WEDNESDAY Northeast to east winds near 5 knots, becoming southeast to south. Bay waters smooth. A slight chance of showers. WEDNESDAY NIGHT South to southwest winds near 5 knots. Bay waters smooth. $$
GMZ031-310800- Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound- 352 PM EDT Fri Oct 30 2026 TONIGHT Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers and thunderstorms. SATURDAY Northeast to east winds near 15 knots. Bay waters a moderate chop. A chance of showers with a slight chance of thunderstorms. SATURDAY NIGHT Northeast to east winds 15 to 20 knots. Bay waters choppy. Showers likely with a slight chance of thunderstorms. SUNDAY Northeast to east winds near 15 knots. Bay waters a moderate chop. Showers likely with a chance of thunderstorms. SUNDAY NIGHT East winds 10 to 15 knots. Bay waters a light to moderate chop. Showers likely with a chance of thunderstorms. MONDAY East winds 10 to 15 knots. Bay waters a light to moderate chop. A chance of showers and thunderstorms. MONDAY NIGHT Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. A slight chance of showers and thunderstorms. TUESDAY Northeast winds near 10 knots, becoming east to southeast. Bay waters a light chop. A slight chance of showers. TUESDAY NIGHT East winds 5 to 10 knots. Bay waters smooth to a light chop. A slight chance of showers. WEDNESDAY Northeast to east winds near 5 knots, becoming southeast to south. Bay waters smooth. A slight chance of showers. WEDNESDAY NIGHT South to southwest winds near 5 knots. Bay waters smooth. $$