FZUS61 KBUF 041408 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1007 AM EDT Sat Apr 4 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...A 29.4 inch surface low will track through the central Great Lakes today, then into Quebec tonight and Sunday, while dragging a strong cold front across the lake early tonight, with a secondary cold front then following Sunday night and Monday. A 30.5 inch high will then build across the Great Lakes Tuesday and Tuesday night, before sliding east and off the New England coast Wednesday. LOZ062-042100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1007 AM EDT Sat Apr 4 2026 .REST OF TODAY...East winds 15 to 25 knots. A chance of rain showers late this morning, then rain showers likely early this afternoon. A chance of rain showers late. Waves 2 to 3 feet building to 3 to 6 feet. .TONIGHT...East winds 15 to 20 knots becoming southwest. A chance of showers early, then showers with a chance of thunderstorms. Showers late. Waves 3 to 5 feet subsiding to 2 to 4 feet. .SUNDAY...West winds 15 to 25 knots. A chance of rain showers in the afternoon. Waves 3 to 5 feet building to 5 to 7 feet. Waves occasionally around 9 feet. .SUNDAY NIGHT...West winds 15 to 25 knots. A chance of rain showers in the evening. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around 9 feet. .MONDAY...West winds 15 to 20 knots becoming northwest. A chance of rain and snow showers during the day, then snow and rain showers likely Monday night. Waves 3 to 5 feet subsiding to 1 to 3 feet. .TUESDAY...Northwest winds 15 to 20 knots becoming west 5 to 15 knots. Snow showers likely during the day. Waves 3 to 5 feet subsiding to 1 to 3 feet. .WEDNESDAY...South winds 5 to 10 knots increasing to 15 to 25 knots. Waves 1 foot or less building to 3 to 6 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-042100- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1007 AM EDT Sat Apr 4 2026 .REST OF TODAY...Northeast winds 15 to 20 knots becoming east. A chance of rain showers this afternoon. Waves 1 to 2 feet building to 2 to 4 feet. .TONIGHT...East winds 15 to 20 knots becoming southwest and increasing to 30 knots. A chance of showers early, then showers likely with a chance of thunderstorms late in the evening. Showers with a chance of thunderstorms after midnight. Waves 2 to 4 feet building to 5 to 8 feet. Waves occasionally around 10 feet. .SUNDAY...West winds 15 to 25 knots increasing to 30 knots. Rain showers in the morning, then a chance of rain showers in the afternoon. Waves 3 to 6 feet building to 5 to 9 feet. Waves occasionally around 11 feet. .SUNDAY NIGHT...West winds to 30 knots diminishing to 15 to 25 knots. A chance of rain showers in the evening. Waves 6 to 10 feet. Waves occasionally around 13 feet. .MONDAY...West winds 15 to 20 knots becoming northwest. A chance of rain and snow showers during the day, then snow and rain showers likely Monday night. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. .TUESDAY...North winds 15 to 25 knots becoming northwest and diminishing to 10 to 15 knots. Snow showers likely during the day. Waves 3 to 5 feet subsiding to 2 to 4 feet. .WEDNESDAY...South winds 5 to 10 knots increasing to 30 knots. Waves 2 feet or less building to 5 to 8 feet. Waves occasionally around 10 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-042100- MAFOR 0415/ ONTARIO WEST 1/2 13230 11326 12526 12620. A chance of thunderstorms tonight. Waves 2 to 3 feet building to 3 to 6 feet this afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet tonight. Waves 3 to 5 feet Sunday morning. ONTARIO EAST 1/2 12120 11220 11330 11436 11536 11526 11620. A chance of thunderstorms overnight. Waves 1 to 3 feet this afternoon. Waves 2 to 4 feet building to 5 to 8 feet, and occasionally around 10 feet tonight. Waves 3 to 6 feet Sunday morning. $$