FZUS61 KBUF 300202 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1002 PM EDT Wed Apr 29 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 29.9 inch low will lift out across Quebec tonight and Thursday while another 29.6 inch low develops and tracks northeast off the mid-Atlantic and New England coastlines. This second low will then retrograde northward and then northwestward across the Canadian Maritimes and Quebec respectively Friday and Saturday. A third 29.5 inch low will then track from the southeastern states northeastward into the western Atlantic Saturday through Sunday... while a 29.8 inch high ridges across the Lower Great Lakes. LOZ062-300900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1002 PM EDT Wed Apr 29 2026 .REST OF TONIGHT...Northwest winds 10 to 15 knots becoming west. A chance of showers late this evening. Waves 2 to 3 feet. .THURSDAY...West winds 10 to 15 knots increasing to 15 to 20 knots. Waves 2 to 4 feet. .THURSDAY NIGHT...West winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .FRIDAY...West winds 10 to 15 knots. Waves 1 to 2 feet. .FRIDAY NIGHT...West winds around 10 knots. Waves 1 to 2 feet. .SATURDAY...West winds 10 to 15 knots. Waves 1 to 2 feet. .SUNDAY...West winds 10 to 15 knots becoming southwest. Waves 1 to 3 feet. .MONDAY...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots. Showers likely. Waves 2 to 4 feet subsiding to 1 to 3 feet. $$ LOZ063>065-300900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1002 PM EDT Wed Apr 29 2026 .REST OF TONIGHT...Northwest winds 10 to 15 knots becoming west. Rain, then a chance of showers late. Waves 1 to 3 feet. .THURSDAY...West winds 10 to 15 knots increasing to 15 to 20 knots. Waves 2 to 4 feet building to 3 to 5 feet. .THURSDAY NIGHT...West winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .FRIDAY...West winds 10 to 15 knots. Waves 1 to 3 feet. .FRIDAY NIGHT...West winds 10 to 15 knots. Waves 1 to 3 feet. .SATURDAY...West winds 5 to 15 knots. Waves 1 to 3 feet. .SUNDAY...West winds 10 to 15 knots becoming southwest. Waves 1 to 3 feet. .MONDAY...South winds 10 to 15 knots becoming southwest 15 to 20 knots. Showers likely. Waves 1 to 3 feet. $$ LOZ061-300900- MAFOR 3003/ ONTARIO WEST 1/2 11710 14610 12620 11610. A chance of showers late this evening. Waves 2 to 4 feet. ONTARIO EAST 1/2 11716 11616 13610 13620. Waves 1 to 3 feet overnight. Waves 2 to 4 feet building to 3 to 5 feet Thursday. Waves 3 to 5 feet Thursday evening. $$