AMZ400-212100-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
225 AM EDT Mon Sep 21 2026
.SYNOPSIS...
Surface troughing and a disturbance aloft located just west of Tampa
Bay will lift northeastward across our local waters on Monday night
and Tuesday morning. Scattered showers and thunderstorms are
forecast to continue through Tuesday. East-northeasterly winds will
prevail, with afternoon sea breeze shifting winds to easterly for
the nearshore waters through midweek. Strong high pressure building
over New England on Wednesday will wedge down the southeastern
seaboard on Wednesday night, driving a frontal boundary southward
across our area that will be accompanied by widespread showers and
embedded thunderstorms. A surge of north-northeasterly winds will
then overspread our local waters in the wake of this frontal passage
on Wednesday night, with Small Craft Advisory conditions expected
across our local waters from late Wednesday night through Friday.
Winds may occasionally gust to Gale Force on Thursday afternoon and
evening. Breezy northeasterly winds and elevated seas may continue
into Saturday before subsiding on Saturday night and 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.
$$
AMZ450-452-454-212100- 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- 225 AM EDT Mon Sep 21 2026 REST OF TONIGHT Northwest winds around 5 knots. Seas around 2 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters smooth. A chance of showers with a slight chance of thunderstorms. MONDAY North winds 5 to 10 knots, becoming east in the 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 slight chance of thunderstorms. A chance of showers, mainly in the morning. MONDAY NIGHT 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. 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 in the morning. A chance of thunderstorms through the day. A chance of showers through the night. A slight chance of thunderstorms in the evening, then a slight chance of showers after midnight. 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 through the day. Winds and waves higher in and near thunderstorms. $$
AMZ450-452-454-212100- 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- 225 AM EDT Mon Sep 21 2026 REST OF TONIGHT Northwest winds around 5 knots. Seas around 2 feet. Wave Detail: East 2 feet at 8 seconds. Intracoastal waters smooth. A chance of showers with a slight chance of thunderstorms. MONDAY North winds 5 to 10 knots, becoming east in the 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 slight chance of thunderstorms. A chance of showers, mainly in the morning. MONDAY NIGHT 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. 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 in the morning. A chance of thunderstorms through the day. A chance of showers through the night. A slight chance of thunderstorms in the evening, then a slight chance of showers after midnight. 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 through the day. Winds and waves higher in and near thunderstorms. $$