AMZ400-131630-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
922 PM EDT Sat Sep 12 2026
.SYNOPSIS...
Showers and thunderstorms over the offshore waters should dissipate
towards midnight tonight. Otherwise, weakening high pressure
stretching across south Florida and a trough progressing across the
southeastern states will create a prevailing west-northwesterly wind
flow across our local waters through Sunday morning, with the
afternoon sea breeze shifting winds to onshore across the near shore
waters. Scattered afternoon and early evening thunderstorms will be
possible on Sunday, mainly across the near shore waters. A few
strong storms could develop, containing strong wind gusts, frequent
lightning strikes, and torrential downpours. Coverage of afternoon
showers and thunderstorms will briefly shift south of St. Augustine
on Monday. Strengthening high pressure over New England on Tuesday
will then send a surge northeasterly winds southward across our
local waters, with Small Craft Advisory conditions and building seas
overspreading the waters during the afternoon hours and likely
continuing through Thursday. These strong onshore winds are expected
to develop waves of scattered to numerous showers and embedded
thunderstorms throughout our local waters from Tuesday through at
least Thursday.
.GULF STREAM...
The approximate location of the west wall of the Gulf Stream as of
Sep 12, 2026 at 0000 UTC...
50 nautical miles east of Flagler Beach.
58 nautical miles east of Saint Augustine Beach.
64 nautical miles east southeast of Jacksonville Beach.
76 nautical miles east southeast of St Simons Island.
This data derived from NCEP Global RTOFS model.
$$
AMZ450-452-454-131630- 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- 922 PM EDT Sat Sep 12 2026 REST OF TONIGHT Southwest winds 10 to 15 knots, becoming west 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 4 seconds and east 2 feet at 8 seconds. Intracoastal waters becoming mostly smooth. SUNDAY West northwest winds around 10 knots, becoming east northeast 10 to 15 knots in the afternoon. Seas around 2 feet. Wave Detail: South 2 feet at 4 seconds and east 2 feet at 8 seconds. Intracoastal waters a light chop. A chance of showers and thunderstorms in the afternoon. A few strong storms will be possible late in the afternoon, with strong wind gusts, frequent lightning strikes, and torrential downpours. SUNDAY NIGHT South winds 10 to 15 knots, becoming west 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 9 seconds and southeast 2 feet at 4 seconds. Intracoastal waters becoming mostly smooth. A chance of showers and thunderstorms in the evening. MONDAY Northwest winds 5 to 10 knots, becoming east northeast around 10 knots in the afternoon. Seas around 2 feet. Wave Detail: Southeast 2 feet at 9 seconds. Intracoastal waters becoming a light chop. A slight chance of showers and thunderstorms late in the afternoon. MONDAY NIGHT Southeast winds around 5 knots, becoming northeast around 10 knots after midnight. Seas around 2 feet. Wave Detail: East 2 feet at 9 seconds. Intracoastal waters mostly smooth. TUESDAY Northeast winds 15 to 20 knots, increasing to 20 to 25 knots in the afternoon. Seas 2 to 3 feet, building to 4 to 6 feet, occasionally to 8 feet in the afternoon. Wave Detail: Northeast 3 feet at 7 seconds and east 2 feet at 9 seconds, becoming northeast 6 feet at 5 seconds and east 2 feet at 9 seconds. Intracoastal waters becoming rough. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. TUESDAY NIGHT Northeast winds 20 to 25 knots. Seas 6 to 8 feet, occasionally to 10 feet. Intracoastal waters rough. A chance of showers with a slight chance of thunderstorms. WEDNESDAY Northeast winds 20 to 25 knots. Seas 6 to 9 feet, occasionally to 11 feet. Intracoastal waters rough. A chance of showers. and thunderstorms after midnight. WEDNESDAY NIGHT AND THURSDAY Northeast winds around 20 knots, becoming east 15 to 20 knots during the afternoon. Seas 5 to 7 feet, occasionally to 9 feet. Intracoastal waters becoming choppy. Showers likely with a chance of thunderstorms. Winds and waves higher in and near thunderstorms. $$
AMZ450-452-454-131630- 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- 922 PM EDT Sat Sep 12 2026 REST OF TONIGHT Southwest winds 10 to 15 knots, becoming west 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 4 seconds and east 2 feet at 8 seconds. Intracoastal waters becoming mostly smooth. SUNDAY West northwest winds around 10 knots, becoming east northeast 10 to 15 knots in the afternoon. Seas around 2 feet. Wave Detail: South 2 feet at 4 seconds and east 2 feet at 8 seconds. Intracoastal waters a light chop. A chance of showers and thunderstorms in the afternoon. A few strong storms will be possible late in the afternoon, with strong wind gusts, frequent lightning strikes, and torrential downpours. SUNDAY NIGHT South winds 10 to 15 knots, becoming west 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 9 seconds and southeast 2 feet at 4 seconds. Intracoastal waters becoming mostly smooth. A chance of showers and thunderstorms in the evening. MONDAY Northwest winds 5 to 10 knots, becoming east northeast around 10 knots in the afternoon. Seas around 2 feet. Wave Detail: Southeast 2 feet at 9 seconds. Intracoastal waters becoming a light chop. A slight chance of showers and thunderstorms late in the afternoon. MONDAY NIGHT Southeast winds around 5 knots, becoming northeast around 10 knots after midnight. Seas around 2 feet. Wave Detail: East 2 feet at 9 seconds. Intracoastal waters mostly smooth. TUESDAY Northeast winds 15 to 20 knots, increasing to 20 to 25 knots in the afternoon. Seas 2 to 3 feet, building to 4 to 6 feet, occasionally to 8 feet in the afternoon. Wave Detail: Northeast 3 feet at 7 seconds and east 2 feet at 9 seconds, becoming northeast 6 feet at 5 seconds and east 2 feet at 9 seconds. Intracoastal waters becoming rough. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. TUESDAY NIGHT Northeast winds 20 to 25 knots. Seas 6 to 8 feet, occasionally to 10 feet. Intracoastal waters rough. A chance of showers with a slight chance of thunderstorms. WEDNESDAY Northeast winds 20 to 25 knots. Seas 6 to 9 feet, occasionally to 11 feet. Intracoastal waters rough. A chance of showers. and thunderstorms after midnight. WEDNESDAY NIGHT AND THURSDAY Northeast winds around 20 knots, becoming east 15 to 20 knots during the afternoon. Seas 5 to 7 feet, occasionally to 9 feet. Intracoastal waters becoming choppy. Showers likely with a chance of thunderstorms. Winds and waves higher in and near thunderstorms. $$