AMZ400-220430-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
929 AM EDT Mon Sep 21 2026
.SYNOPSIS...
A surface trough and an upper level disturbance will bring scattered
showers and thunderstorms to local waters through Tuesday. By
Wednesday night, strong high pressure well to the north will help
push a backdoor cold front south into the area, allowing for another
round of showers and thunderstorms, and a surge of northeast winds
and building seas. This front will then trigger Small Craft Advisory
conditions from late Wednesday night through Friday, with potential
for Gale Force Wind Gusts from Thursday to early Friday morning.
Breezy winds and elevated seas will slowly subside late Saturday
night into Sunday.
.GULF STREAM...
The approximate location of the west wall of the Gulf Stream as of
Sep 20, 2026 at 0000 UTC...
50 nautical miles east of Flagler Beach.
58 nautical miles east of Saint Augustine Beach.
70 nautical miles east southeast of Jacksonville Beach.
80 nautical miles east southeast of St Simons Island.
This data derived from NCEP Global RTOFS model.
$$
AMZ450-452-454-220430- Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM- Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM- Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- 929 AM EDT Mon Sep 21 2026 REST OF TODAY North winds 5 to 10 knots, becoming east this afternoon. Seas around 2 feet. Wave Detail: Northeast 2 feet at 5 seconds and east 2 feet at 8 seconds. Intracoastal waters light chop. A chance of showers and thunderstorms, mainly this morning. TONIGHT Southeast winds 5 to 10 knots, becoming south after midnight. Seas 2 to 3 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters light chop. A slight chance of showers and thunderstorms. TUESDAY Northeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters light chop. A slight chance of showers and thunderstorms. TUESDAY NIGHT East winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters light chop. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. WEDNESDAY Northeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 4 seconds and east 2 feet at 7 seconds. Intracoastal waters a moderate chop. Showers likely. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. WEDNESDAY NIGHT Northeast winds 15 to 20 knots, increasing to 20 to 25 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 5 seconds. Intracoastal waters rough. A chance of showers. A chance of thunderstorms, mainly in the evening. THURSDAY North winds 25 to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet, building to 7 to 10 feet, occasionally to 13 feet. Intracoastal waters very rough. Showers likely and chance of thunderstorms. FRIDAY Northeast winds 20 to 25 knots, diminishing to 15 to 20 knots. Seas 6 to 9 feet, occasionally to 11 feet, subsiding to 5 to 7 feet, occasionally to 9 feet after midnight. Intracoastal waters rough. A chance of showers. Winds and waves higher in and near thunderstorms. $$
AMZ450-452-454-220430- Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM- Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM- Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- 929 AM EDT Mon Sep 21 2026 REST OF TODAY North winds 5 to 10 knots, becoming east this afternoon. Seas around 2 feet. Wave Detail: Northeast 2 feet at 5 seconds and east 2 feet at 8 seconds. Intracoastal waters light chop. A chance of showers and thunderstorms, mainly this morning. TONIGHT Southeast winds 5 to 10 knots, becoming south after midnight. Seas 2 to 3 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters light chop. A slight chance of showers and thunderstorms. TUESDAY Northeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters light chop. A slight chance of showers and thunderstorms. TUESDAY NIGHT East winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters light chop. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. WEDNESDAY Northeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 4 seconds and east 2 feet at 7 seconds. Intracoastal waters a moderate chop. Showers likely. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. WEDNESDAY NIGHT Northeast winds 15 to 20 knots, increasing to 20 to 25 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 5 seconds. Intracoastal waters rough. A chance of showers. A chance of thunderstorms, mainly in the evening. THURSDAY North winds 25 to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet, building to 7 to 10 feet, occasionally to 13 feet. Intracoastal waters very rough. Showers likely and chance of thunderstorms. FRIDAY Northeast winds 20 to 25 knots, diminishing to 15 to 20 knots. Seas 6 to 9 feet, occasionally to 11 feet, subsiding to 5 to 7 feet, occasionally to 9 feet after midnight. Intracoastal waters rough. A chance of showers. Winds and waves higher in and near thunderstorms. $$