FZUS61 KBUF 022010 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 409 PM EDT Thu Apr 2 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 29.6 inch low will move across the upper Great Lakes tonight and to southern Quebec Friday afternoon, while lifting a warm front northward across the lake tonight, followed by a weak trailing cold front Friday afternoon. A 29.4 inch surface low will track through the central Great Lakes Saturday, then into Quebec Saturday night and Sunday, while dragging a strong cold front across the lake Saturday night, 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. LOZ062-030300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 409 PM EDT Thu Apr 2 2026 .TONIGHT...East winds 15 to 25 knots becoming south. A chance of rain showers early, then a chance of rain showers and thunderstorms. Rain showers likely late. Waves 4 to 7 feet subsiding to 3 to 5 feet. Waves occasionally around 9 feet. .FRIDAY...Southwest winds 15 to 25 knots becoming west. Showers likely early. Waves 3 to 6 feet. .FRIDAY NIGHT...West winds 15 to 20 knots becoming northeast 5 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .SATURDAY...East winds 10 to 15 knots increasing to 15 to 20 knots. A chance of rain showers in the morning, then rain showers in the afternoon. Waves 1 to 2 feet building to 3 to 5 feet. .SATURDAY NIGHT...East winds 10 to 15 knots becoming southwest 15 to 20 knots. Showers. Waves 2 to 4 feet. .SUNDAY...West winds 15 to 25 knots. Rain showers during the day. Waves 5 to 8 feet. Waves occasionally around 10 feet. .MONDAY...West winds 15 to 20 knots becoming northwest. A chance of snow showers Monday night. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. .TUESDAY...North winds 15 to 20 knots. A chance of snow showers during the day. Waves 3 to 5 feet subsiding to 1 to 3 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-030300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 409 PM EDT Thu Apr 2 2026 .TONIGHT...East winds 15 to 20 knots becoming south and increasing to 30 knots. A chance of showers early, then a chance of showers and thunderstorms late this evening. Showers likely with a chance of thunderstorms after midnight. Waves 3 to 6 feet building to 5 to 8 feet. Waves occasionally around 10 feet. .FRIDAY...South winds to 30 knots becoming southwest and diminishing to 15 to 20 knots. Showers likely with a chance of thunderstorms early, then a chance of showers late in the morning. Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally around 10 feet. .FRIDAY NIGHT...West winds 15 to 20 knots becoming north 5 to 15 knots. Waves 3 to 6 feet subsiding to 1 to 3 feet. .SATURDAY...Northeast winds 10 to 15 knots becoming east. A chance of rain showers in the morning, then rain showers likely in the afternoon. Waves 1 to 3 feet. .SATURDAY NIGHT...Southeast winds 15 to 20 knots becoming southwest and increasing to 30 knots. Showers with a chance of thunderstorms in the evening, then showers overnight. Waves 1 to 3 feet building to 3 to 6 feet. .SUNDAY...West winds 15 to 20 knots increasing to 30 knots. Rain showers during the day, then a chance of snow showers Sunday night. Waves 5 to 8 feet building to 7 to 10 feet. Waves occasionally around 13 feet. .MONDAY...West winds 15 to 25 knots becoming northwest 15 to 20 knots. A chance of snow showers. Waves 6 to 9 feet subsiding to 2 to 4 feet. Waves occasionally around 11 feet. .TUESDAY...North winds 15 to 20 knots. A chance of snow showers during the day. Waves 3 to 5 feet subsiding to 2 to 4 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-030300- MAFOR 0221/ ONTARIO WEST 1/2 12230 11320 11420 11436 13530. Waves 5 to 8 feet subsiding to 3 to 6 feet, and occasionally around 10 feet tonight. Waves 3 to 6 feet Friday. ONTARIO EAST 1/2 11220 11330 11340 12446 12430 11520. A chance of thunderstorms overnight. Waves 3 to 6 feet building to 5 to 8 feet, and occasionally around 10 feet tonight. Waves 5 to 8 feet subsiding to 3 to 6 feet, and occasionally around 10 feet Friday. $$