FZUS52 KJAX 210426 CWFJAX Coastal Waters Forecast for Northeast Florida/Southeast Georgia National Weather Service Jacksonville FL 1226 AM EDT Sun Jun 21 2026 Atlantic Coastal Waters from Altamaha Sound GA to Flagler Beach FL out to 60 nm. Seas are provided as a range of the average height of the highest 1/3 of the waves, along with the occasional height of the average highest 1/10 of the waves. AMZ400-211930- Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm- 1226 AM EDT Sun Jun 21 2026 .SYNOPSIS... A frontal boundary will shift north of the waters Today. Weak high pressure ridge will slowly build in over the area waters Monday and into Tuesday with isolated to scattered thunderstorms returning by midweek as another front moves in from the north. Stronger offshore winds with exercise caution level winds looks possible for offshore waters Monday into Tuesday. .GULF STREAM... The approximate location of the west wall of the Gulf Stream as of Jun 20, 2026 at 0000 UTC... 50 nautical miles east of Flagler Beach. 53 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. $$ AMZ450-452-454-211930- Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM- Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM- Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- 1226 AM EDT Sun Jun 21 2026 .REST OF TONIGHT...West winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 7 seconds. Intracoastal waters light chop. A chance of showers with a slight chance of thunderstorms late this evening. .SUNDAY...Northwest winds 5 to 10 knots, becoming southwest in the afternoon. Seas around 2 feet. Intracoastal waters light chop. A slight chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. .SUNDAY NIGHT...Southwest winds 5 to 10 knots. Seas around 2 feet. Intracoastal waters light chop. A chance of showers with a slight chance of thunderstorms in the evening. .MONDAY...Southwest winds 5 to 10 knots, becoming south in the afternoon. Seas around 2 feet. Intracoastal waters light chop. A slight chance of showers and thunderstorms in the afternoon. .MONDAY NIGHT...Southwest winds 10 to 15 knots. Seas around 2 feet. Wave Detail: South 2 feet at 3 seconds. Intracoastal waters a moderate chop. .TUESDAY...West winds 10 to 15 knots, becoming south 5 to 10 knots in the afternoon. Seas around 2 feet. Wave Detail: Southwest 2 feet at 3 seconds and southeast 2 feet at 7 seconds. Intracoastal waters a moderate chop. A chance of showers and thunderstorms in the afternoon. .TUESDAY NIGHT...West winds around 10 knots. Seas around 2 feet. Intracoastal waters light chop. A slight chance of showers and thunderstorms in the evening. .WEDNESDAY THROUGH THURSDAY...Southwest winds 10 to 15 knots. Seas around 2 feet. Intracoastal waters a moderate chop. A chance of showers and thunderstorms. Winds and waves higher in and near thunderstorms. $$ AMZ470-472-474-211930- Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 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- 1226 AM EDT Sun Jun 21 2026 .REST OF TONIGHT...West winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: West 2 feet at 3 seconds and southeast 2 feet at 7 seconds. A chance of showers and thunderstorms late this evening, then a slight chance of showers. .SUNDAY...West winds 5 to 10 knots. Seas around 2 feet. Wave Detail: West 2 feet at 3 seconds. A slight chance of showers. A slight chance of thunderstorms in the afternoon. .SUNDAY NIGHT...Southwest winds around 10 knots. Seas around 2 feet. Wave Detail: Southwest 2 feet at 3 seconds. A slight chance of thunderstorms in the evening. A slight chance of showers. .MONDAY...West winds 5 to 10 knots, becoming south in the afternoon. Seas around 2 feet. Wave Detail: Southwest 2 feet at 3 seconds. .MONDAY NIGHT...Southwest winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: South 2 feet at 4 seconds and southeast 2 feet at 7 seconds. .TUESDAY...West winds 10 to 15 knots, becoming south in the afternoon. Seas 2 to 3 feet. Wave Detail: West 2 feet at 4 seconds and southeast 2 feet at 7 seconds. A slight chance of showers and thunderstorms in the afternoon. .TUESDAY NIGHT...Southwest winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms in the evening. .WEDNESDAY THROUGH THURSDAY...Southwest winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms. Winds and seas higher in and near thunderstorms. $$