AMZ400-182100-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
226 AM EDT Fri Sep 18 2026
.SYNOPSIS...
High pressure situated over the southeastern states will gradually
weaken today, with a weak coastal trough positioned over the
northeast Florida waters developing scattered showers and possibly
an embedded thunderstorm through late this afternoon, mostly for the
waters from St. Augustine southward. Winds and seas should remain
below Caution levels during the next several days throughout our
local waters, and surface trough and disturbance aloft crossing the
Florida peninsula on Saturday will emerge over the eastern Gulf on
Sunday and Monday. Showers and thunderstorms are expected to
increase beginning late Saturday night, with activity likely
continuing through at least early next week. A stronger high
pressure center may attempt to wedge down the southeastern seaboard
later next week, potentially resulting in another round of stronger
northeasterly winds across our local waters.
.GULF STREAM...
The approximate location of the west wall of the Gulf Stream as of
Sep 17, 2026 at 0000 UTC...
54 nautical miles east of Flagler Beach.
62 nautical miles east of Saint Augustine Beach.
74 nautical miles east southeast of Jacksonville Beach.
71 nautical miles east southeast of St Simons Island.
This data derived from NCEP Global RTOFS model.
$$
AMZ452-454-472-474-182100- Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM- Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM- Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM- 226 AM EDT Fri Sep 18 2026 REST OF TONIGHT Northeast winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Intracoastal waters a moderate chop. A chance of showers with a slight chance of thunderstorms. FRIDAY Northeast winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 7 seconds. Intracoastal waters a moderate chop. A slight chance of thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. FRIDAY NIGHT East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Intracoastal waters light chop. A slight chance of showers and thunderstorms. SATURDAY Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds. Intracoastal waters light chop. A slight chance of showers. SATURDAY NIGHT East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 8 seconds and southeast 2 feet at 9 seconds. Intracoastal waters light chop. A slight chance of showers in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. SUNDAY Northeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Northeast 2 feet at 7 seconds and east 2 feet at 11 seconds. Intracoastal waters light chop. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. SUNDAY NIGHT East winds 5 to 10 knots. Seas around 2 feet. Intracoastal waters light chop. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. MONDAY East winds 5 to 10 knots, becoming southeast. Seas 2 to 3 feet. Intracoastal waters light chop. A chance of thunderstorms. TUESDAY Northeast winds around 5 knots, becoming southeast. Seas 2 to 3 feet. Intracoastal waters smooth. A chance of showers and thunderstorms. Winds and waves higher in and near thunderstorms. $$
AMZ452-454-472-474-182100- Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM- Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM- Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM- 226 AM EDT Fri Sep 18 2026 REST OF TONIGHT Northeast winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Intracoastal waters a moderate chop. A chance of showers with a slight chance of thunderstorms. FRIDAY Northeast winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 7 seconds. Intracoastal waters a moderate chop. A slight chance of thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. FRIDAY NIGHT East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Intracoastal waters light chop. A slight chance of showers and thunderstorms. SATURDAY Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds. Intracoastal waters light chop. A slight chance of showers. SATURDAY NIGHT East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 8 seconds and southeast 2 feet at 9 seconds. Intracoastal waters light chop. A slight chance of showers in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. SUNDAY Northeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Northeast 2 feet at 7 seconds and east 2 feet at 11 seconds. Intracoastal waters light chop. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. SUNDAY NIGHT East winds 5 to 10 knots. Seas around 2 feet. Intracoastal waters light chop. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. MONDAY East winds 5 to 10 knots, becoming southeast. Seas 2 to 3 feet. Intracoastal waters light chop. A chance of thunderstorms. TUESDAY Northeast winds around 5 knots, becoming southeast. Seas 2 to 3 feet. Intracoastal waters smooth. A chance of showers and thunderstorms. Winds and waves higher in and near thunderstorms. $$