AMZ400-190900-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
224 PM EDT Sat Jul 18 2026
.SYNOPSIS...
Bermuda high pressure will extend a ridge axis across southern
Florida today, shifting winds southerly across the local waters
today. As winds shift they will strengthen to Exercise Caution
levels between a trough over the southeastern US and the ridge axis
to the south. Drier air moving into the coastal waters will limit
thunderstorm potential through the weekend and possibly into next
week.
There's greater uncertainty in the forecast next week regarding the
potential for tropical development in the northeastern Gulf. That
system is now more likely to drift northwest through the first half
of next week. For the second half of next week, a prolonged offshore
flow is likely to remain in place with nocturnal southerly wind
surges as a cold front approaches from the northwest.
.GULF STREAM...
The approximate location of the west wall of the Gulf Stream as of
Jul 18, 2026 at 0000 UTC...
46 nautical miles east of Flagler Beach.
49 nautical miles east of Saint Augustine Beach.
60 nautical miles east southeast of Jacksonville Beach.
68 nautical miles east southeast of St Simons Island.
This data derived from NCEP Global RTOFS model.
$$
AMZ450-452-454-190900- 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- 224 PM EDT Sat Jul 18 2026 SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL MIDNIGHT EDT TONIGHT REST OF TODAY Southeast winds 15 to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 4 seconds. Intracoastal waters choppy. TONIGHT South winds 15 to 20 knots, becoming southwest 10 to 15 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 5 seconds and east 2 feet at 8 seconds. Intracoastal waters choppy. SUNDAY South winds 10 to 15 knots, becoming southeast 15 to 20 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 6 seconds. Intracoastal waters choppy. SUNDAY NIGHT South winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 5 seconds and east 2 feet at 8 seconds. Intracoastal waters choppy. MONDAY South winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 6 seconds. Intracoastal waters choppy. A chance of showers and thunderstorms in the afternoon. MONDAY NIGHT South winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 6 seconds. Intracoastal waters choppy. A slight chance of showers and thunderstorms in the evening. TUESDAY South winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Intracoastal waters choppy. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. A slight chance of showers and thunderstorms in the evening. WEDNESDAY South winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Intracoastal waters choppy. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. A slight chance of showers and thunderstorms through the night. Winds and waves higher in and near thunderstorms. $$
AMZ450-452-454-190900- 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- 224 PM EDT Sat Jul 18 2026 SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL MIDNIGHT EDT TONIGHT REST OF TODAY Southeast winds 15 to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 4 seconds. Intracoastal waters choppy. TONIGHT South winds 15 to 20 knots, becoming southwest 10 to 15 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 5 seconds and east 2 feet at 8 seconds. Intracoastal waters choppy. SUNDAY South winds 10 to 15 knots, becoming southeast 15 to 20 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 6 seconds. Intracoastal waters choppy. SUNDAY NIGHT South winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 5 seconds and east 2 feet at 8 seconds. Intracoastal waters choppy. MONDAY South winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 6 seconds. Intracoastal waters choppy. A chance of showers and thunderstorms in the afternoon. MONDAY NIGHT South winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 6 seconds. Intracoastal waters choppy. A slight chance of showers and thunderstorms in the evening. TUESDAY South winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Intracoastal waters choppy. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. A slight chance of showers and thunderstorms in the evening. WEDNESDAY South winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Intracoastal waters choppy. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. A slight chance of showers and thunderstorms through the night. Winds and waves higher in and near thunderstorms. $$