FZUS52 KJAX 190056 CWFJAX Coastal Waters Forecast for Northeast Florida/Southeast Georgia National Weather Service Jacksonville FL 856 PM EDT Mon May 18 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. AMZ400-191600- Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm- 856 PM EDT Mon May 18 2026 .SYNOPSIS... Atlantic high pressure centered to Bermuda will continue to extend its axis across the southeastern states through midweek. An easterly wind surge late this afternoon through this evening will result in Caution level wind speeds for the northeast Florida waters. Prevailing east to southeasterly winds will continue across our local waters during the next several days, with isolated to widely scattered showers and perhaps a few isolated thunderstorms possible, mainly during the overnight and early morning hours. A frontal boundary will briefly stall over the southeastern states late this week before lifting northward as a warm front during the Holiday weekend. Caution conditions will again be possible for the near shore waters from Friday through early next week as Atlantic high pressure becomes reinforced near Bermuda. .GULF STREAM... The approximate location of the west wall of the Gulf Stream as of May 18, 2026 at 0000 UTC... 50 nautical miles east of Flagler Beach. 58 nautical miles east of Saint Augustine Beach. 70 nautical miles east southeast of Jacksonville Beach. 76 nautical miles east southeast of St Simons Island. This data derived from NCEP Global RTOFS model. $$ AMZ450-470-191600- Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM- Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM- 856 PM EDT Mon May 18 2026 .REST OF TONIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 8 seconds and east 3 feet at 5 seconds. Intracoastal waters a moderate chop. .TUESDAY...East winds 5 to 10 knots. Seas around 3 feet. Wave Detail: Southeast 3 feet at 7 seconds. Intracoastal waters light chop. .TUESDAY NIGHT...East winds 5 to 10 knots, becoming southeast after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 8 seconds. Intracoastal waters light chop. .WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 8 seconds. Intracoastal waters light chop. .WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 9 seconds. Intracoastal waters light chop. .FRIDAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 9 seconds. Intracoastal waters light chop. .SATURDAY...Southeast winds 5 to 10 knots, increasing to 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Intracoastal waters a moderate chop. A slight chance of showers and thunderstorms after midnight. Winds and waves higher in and near thunderstorms. $$ AMZ452-454-472-474-191600- 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- 856 PM EDT Mon May 18 2026 ...SMALL CRAFT EXERCISE CAUTION IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .REST OF TONIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds. Intracoastal waters choppy. .TUESDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Intracoastal waters a moderate chop. A slight chance of showers in the morning. .TUESDAY NIGHT...East winds 10 to 15 knots, becoming southeast 5 to 10 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 8 seconds. Intracoastal waters a moderate chop. A slight chance of showers after midnight. .WEDNESDAY...East winds 5 to 10 knots. Seas around 3 feet. Wave Detail: East 3 feet at 8 seconds. Intracoastal waters light chop. .WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 9 seconds. Intracoastal waters a moderate chop. .FRIDAY THROUGH SATURDAY...Southeast winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 9 seconds. Intracoastal waters a moderate chop. A slight chance of showers and thunderstorms. Winds and waves higher in and near thunderstorms. $$