FZUS61 KBUF 122102 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 402 PM EST Fri Dec 12 2025 SLZ022-130400- Saint Lawrence River from Cape Vincent to Ogdensburg- 402 PM EST Fri Dec 12 2025 .TONIGHT...West winds 10 knots or less becoming south. A chance of snow showers. Snow showers likely late. .SATURDAY...South winds 10 to 15 knots becoming southwest. Snow showers likely early, then lake effect snow. A chance of snow showers late. .SATURDAY NIGHT...Southwest winds 10 knots or less becoming west. Mostly cloudy. .SUNDAY...Northwest winds 10 knots or less. A chance of snow showers. .SUNDAY NIGHT...Northwest winds 5 to 10 knots becoming west. Partly to mostly cloudy. .MONDAY...West winds less than 10 knots becoming southwest 5 to 15 knots. Lake effect snow showers likely. .TUESDAY...Southwest winds 5 to 10 knots becoming south and increasing to 15 to 20 knots. A chance of snow showers during the day. .WEDNESDAY...Southwest winds 15 to 20 knots becoming south 10 to 15 knots. A chance of rain and snow showers during the day. $$ SLZ024-130400- Saint Lawrence River from Ogdensburg to Saint Regis- 402 PM EST Fri Dec 12 2025 .TONIGHT...West winds less than 10 knots. A chance of snow showers late. .SATURDAY...South winds 5 to 10 knots becoming southwest. Snow showers likely in the morning, then lake effect snow in the afternoon. .SATURDAY NIGHT...Southwest winds 10 knots or less. Mostly cloudy. .SUNDAY...West winds 10 knots or less. Partly to mostly sunny. .SUNDAY NIGHT...West winds 5 to 10 knots. Partly to mostly cloudy. .MONDAY...Southwest winds 5 to 15 knots. A chance of snow showers during the day, then lake effect snow showers likely Monday night. .TUESDAY...Southwest winds 5 to 10 knots becoming south and increasing to 15 to 20 knots. Mostly cloudy. .WEDNESDAY...Southwest winds 15 to 20 knots becoming south 10 to 15 knots. A chance of rain and snow showers during the day. $$