FZUS61 KBUF 310801 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 401 AM EDT Sat May 31 2025 For waters beyond five nautical miles of shore on Lake Ontario Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS...A 29.3 inch low over New Jersey will deepen to 29.0 inches as it tracks northward across New England today, then will slowly fill to 29.3 inches as it pushes further north across Quebec tonight and Sunday. Behind this system, a 29.9 inch high will build south across the upper Great Lakes Sunday, strengthening to 30.1 inches while building southeast across the lower Great Lakes and Ohio Valley through Monday. The area of high pressure will then center along the East Coast on Tuesday and Wednesday. LOZ062-311500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 401 AM EDT Sat May 31 2025 .TODAY...Northwest winds 15 to 20 knots. A chance of showers this morning. Waves 2 to 4 feet building to 3 to 5 feet. .TONIGHT...Northwest winds 15 to 20 knots becoming west. Waves 3 to 5 feet subsiding to 2 to 4 feet. .SUNDAY...West winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 2 to 4 feet. .SUNDAY NIGHT...West winds 10 to 15 knots. Waves 1 to 3 feet. .MONDAY...West winds 10 to 15 knots becoming southwest. Waves 1 to 2 feet. .TUESDAY...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .WEDNESDAY...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots. A chance of showers Wednesday night. Waves 1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to 3 feet. $$ LOZ063>065-311500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 401 AM EDT Sat May 31 2025 .TODAY...Northwest winds 15 to 20 knots becoming west. Showers likely early, then a chance of showers. Waves 1 to 3 feet building to 3 to 5 feet. .TONIGHT...West winds 15 to 20 knots. Waves 3 to 6 feet subsiding to 2 to 4 feet. .SUNDAY...West winds 15 to 20 knots. Waves 3 to 6 feet. .SUNDAY NIGHT...West winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 3 to 6 feet subsiding to 1 to 3 feet. .MONDAY...West winds 5 to 15 knots becoming southwest. Waves 1 to 3 feet. .TUESDAY...Southwest winds 5 to 15 knots becoming south. Waves 1 to 3 feet. .WEDNESDAY...South winds 10 to 15 knots becoming southwest. A chance of showers Wednesday night. Waves 1 to 3 feet. $$ LOZ061-311500- MAFOR 3109/ ONTARIO WEST 1/2 12720 11710 11620 13720 11610. Waves 2 to 4 feet building to 3 to 5 feet today. Waves 3 to 5 feet subsiding to 2 to 4 feet tonight. ONTARIO EAST 1/2 11716 11820 11720 12620 13720. Waves 1 to 3 feet building to 3 to 5 feet today. Waves 3 to 6 feet subsiding to 2 to 4 feet tonight. $$