


Great Lakes Forecast
Issued by NWS
Issued by NWS
254 FZUS61 KBUF 121402 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1002 AM EDT Sat Jul 12 2025 SLZ022-024-122100- Saint Lawrence River from Cape Vincent to Saint Regis 1002 AM EDT Sat Jul 12 2025 .THIS AFTERNOON...South winds 10 knots or less. A chance of showers and thunderstorms. .TONIGHT...South winds 10 knots or less increasing to 10 to 15 knots. A chance of showers and thunderstorms early. .SUNDAY...South winds 5 to 10 knots becoming southwest. A chance of showers and thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. .SUNDAY NIGHT...Southwest winds 10 knots or less. Showers with thunderstorms likely in the evening, then showers likely overnight. .MONDAY...Southwest winds 10 knots or less. A chance of showers during the day. .TUESDAY...Southwest winds less than 10 knots becoming south. Mainly clear. .WEDNESDAY...South winds 10 knots or less becoming southwest. A chance of showers Wednesday night. Winds and waves higher in and near thunderstorms. $$