NWS Marine Forecast


   AMZ400-221445-  Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-  733 PM EDT Tue Apr 21 2026      .SYNOPSIS...    Winds and waves subside gradually tonight as high pressure builds  southward across the area waters. Daily afternoon east-southeast  wind surges in the wake of the sea breeze develop each day through  Friday. Winds shift to southerly ahead of a cold front Saturday and  southwesterly on Sunday as the front begins to stall just north of  the waters. The front will bring increasing chances for showers and  thunderstorms over the waters this weekend.      .GULF STREAM...    The approximate location of the west wall of the Gulf Stream as of  Apr 21, 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.      $$
   AMZ450-452-454-221445-  Coastal waters from Altamaha Sound to Fernandina Beach FL out  20 NM-  Coastal waters from Fernandina Beach to St. Augustine FL out  20 NM-  Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-  733 PM EDT Tue Apr 21 2026    REST OF TONIGHT  East winds 5 to 10 knots, becoming south. Seas  2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at  8 seconds. Intracoastal waters light chop.  WEDNESDAY  Northeast winds 5 to 10 knots, becoming east in the  afternoon. Seas 2 to 3 feet. Wave Detail: East 3 feet at  8 seconds. Intracoastal waters light chop.  WEDNESDAY NIGHT  South winds 5 to 10 knots. Seas 2 to 3 feet.  Wave Detail: East 3 feet at 7 seconds. Intracoastal waters light  chop.  THURSDAY  South winds 5 to 10 knots, becoming southeast 10 to  15 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: East  3 feet at 7 seconds and southeast 2 feet at 3 seconds.  Intracoastal waters a moderate chop.  THURSDAY NIGHT  South winds 5 to 10 knots. Seas 2 to 3 feet.  Wave Detail: East 3 feet at 8 seconds and southeast 2 feet at  3 seconds. Intracoastal waters light chop.  FRIDAY AND FRIDAY NIGHT  Southwest winds 10 to 15 knots. Seas  2 to 3 feet. Wave Detail: Southeast 2 feet at 3 seconds and  southeast 2 feet at 8 seconds. Intracoastal waters a moderate  chop.  SATURDAY THROUGH SUNDAY  East winds 10 to 15 knots. Seas 2 to  3 feet. Intracoastal waters a moderate chop. A chance of showers  with a slight chance of thunderstorms.    Winds and waves higher in and near thunderstorms.    $$