FZUS61 KBUF 051409 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1008 AM EDT Sun Apr 5 2026 SLZ022-024-052100- Saint Lawrence River from Cape Vincent to Saint Regis 1008 AM EDT Sun Apr 5 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING... .THIS AFTERNOON...Southwest winds 10 to 15 knots increasing to 15 to 20 knots. A chance of showers. .TONIGHT...West winds 15 to 20 knots diminishing to 5 to 15 knots. A chance of rain showers early, then a chance of rain and snow showers. A chance of snow showers late. .MONDAY...West winds 5 to 10 knots. A chance of snow showers in the morning. .MONDAY NIGHT...West winds 10 knots or less becoming north. A chance of rain and snow showers in the evening, then snow showers likely overnight. .TUESDAY...North winds 5 to 15 knots becoming southwest less than 10 knots. A chance of snow showers during the day. .WEDNESDAY...Southwest winds 5 to 15 knots becoming south 15 to 20 knots. Mainly clear, then becoming mostly cloudy. .THURSDAY...South winds 15 to 25 knots becoming southwest. A chance of rain showers. $$