FZUS52 KJAX 201824 CWFJAX Coastal Waters Forecast for Northeast Florida/Southeast Georgia National Weather Service Jacksonville FL 224 PM EDT Sat Jun 20 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. AMZ400-210900- Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm- 224 PM EDT Sat Jun 20 2026 .SYNOPSIS... A frontal boundary will move toward the area waters tonight but then shift back north. This front will help bring a round of thunderstorms to area waters through tonight. Some of these storms may produce strong gusty winds, frequent lightning and very heavy rain. A good chance of thunderstorms is expected again Sunday afternoon and evening. Weak high pressure ridge will slowly build in over the area waters early 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. $$ AMZ450-452-454-210900- Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM- Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM- Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- 224 PM EDT Sat Jun 20 2026 .REST OF TODAY...South winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 7 seconds. Intracoastal waters light chop. Showers and thunderstorms likely. .TONIGHT...West winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas around 2 feet. Wave Detail: Southeast 2 feet at 7 seconds. Intracoastal waters a moderate chop. Showers likely with a chance of thunderstorms in the evening. .SUNDAY...Northwest winds 5 to 10 knots, becoming southeast in the afternoon. Seas around 2 feet. Intracoastal waters light chop. A slight chance of showers and thunderstorms in the afternoon. .SUNDAY NIGHT...Southwest winds 5 to 10 knots. Seas around 2 feet. Intracoastal waters light chop. .MONDAY...West winds 5 to 10 knots, becoming south 10 to 15 knots in the afternoon. Seas around 2 feet. Intracoastal waters a moderate chop. A slight chance of showers and thunderstorms in the afternoon. .MONDAY NIGHT...South winds 10 to 15 knots, becoming southwest after midnight. Seas around 2 feet. Wave Detail: Southeast 2 feet at 5 seconds. Intracoastal waters a moderate chop. .TUESDAY THROUGH WEDNESDAY...Southwest winds 10 to 15 knots. Seas 2 to 3 feet. Intracoastal waters a moderate chop. A chance of showers and thunderstorms. Winds and waves higher in and near thunderstorms. $$ AMZ470-472-474-210900- 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- 224 PM EDT Sat Jun 20 2026 .REST OF TODAY...Southwest winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 7 seconds. A chance of showers and thunderstorms. .TONIGHT...West winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas around 2 feet. Wave Detail: West 2 feet at 3 seconds and southeast 2 feet at 7 seconds. A chance of showers and thunderstorms in the evening, then a slight chance of showers after midnight. .SUNDAY...Northwest winds 5 to 10 knots, becoming southwest in the afternoon. Seas around 2 feet. Wave Detail: Southeast 2 feet at 7 seconds. .SUNDAY NIGHT...Southwest winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 7 seconds. .MONDAY...West winds 5 to 10 knots, becoming south 10 to 15 knots in the afternoon. Seas around 2 feet. Wave Detail: Southeast 2 feet at 6 seconds. .MONDAY NIGHT...South winds 10 to 15 knots, becoming southwest after midnight. Seas 2 to 3 feet. Wave Detail: South 2 feet at 4 seconds and southeast 2 feet at 7 seconds. .TUESDAY THROUGH WEDNESDAY...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. $$