FZUS61 KBUF 301402 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1002 AM EDT Thu Apr 30 2026 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...An elongated 29.7 inch low will move into central Quebec this afternoon, while a 29.6 inch low develops and tracks northeast off the mid-Atlantic and New England coastlines through this evening. This second low will then retrograde northward and then northwestward across the Canadian Maritimes and Quebec respectively Friday and Saturday. A 29.7 inch low will then deepen to 29.2 inches as it tracks from the southeastern states northeast off the Atlantic coast Saturday through Sunday, while a 30.2 inch high ridges across the lower Great Lakes. A 29.1 inch low will then pinwheel counterclockwise about Ontario, Quebec, and Hudson Bay Monday through Tuesday night, sending an attendant cold front across the lake Tuesday. LOZ062-302100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1002 AM EDT Thu Apr 30 2026 .THIS AFTERNOON...West winds 10 to 15 knots. Waves 1 to 2 feet. .TONIGHT...West winds 5 to 15 knots becoming northwest. Waves 1 to 2 feet. .FRIDAY...West winds 5 to 10 knots. Waves 1 foot or less. .FRIDAY NIGHT...West winds 5 to 10 knots becoming northwest. Waves 1 foot or less. .SATURDAY...West winds 5 to 10 knots becoming northwest. Waves 1 to 2 feet. .SUNDAY...West winds 10 to 15 knots becoming southwest 15 to 20 knots. A chance of rain showers Sunday night. Waves 1 to 2 feet building to 3 to 5 feet. .MONDAY...Southwest winds 15 to 25 knots. A chance of showers. Waves 3 to 6 feet. $$ LOZ063>065-302100- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1002 AM EDT Thu Apr 30 2026 .THIS AFTERNOON...West winds 10 to 15 knots increasing to 15 to 20 knots. Waves 1 to 3 feet building to 2 to 4 feet. .TONIGHT...West winds 15 to 20 knots becoming northwest 5 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .FRIDAY...Northwest winds 5 to 10 knots becoming west. Waves 2 feet or less. .FRIDAY NIGHT...West winds 5 to 10 knots. Waves 1 to 2 feet. .SATURDAY...West winds 5 to 15 knots. Waves 1 to 2 feet. .SUNDAY...West winds 10 to 15 knots becoming southwest 15 to 20 knots. A chance of rain showers Sunday night. Waves 1 to 3 feet building to 2 to 4 feet. .MONDAY...South winds 15 to 20 knots becoming southwest. Showers likely. Waves 2 to 4 feet building to 3 to 5 feet. $$ LOZ061-302100- MAFOR 3015/ ONTARIO WEST 1/2 13610 12710 11700 12600. Waves 1 to 3 feet this afternoon and tonight. Waves 2 feet or less Friday morning. ONTARIO EAST 1/2 12610 11620 11610 11710 12700 11600. Waves 1 to 3 feet building to 2 to 4 feet this afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight. Waves 2 feet or less Friday morning. $$