FZUS61 KBUF 090211 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1010 PM EDT Wed Apr 8 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 30.6 inch high will move off the coast of New England tonight and southeast of Nova Scotia Thursday. A 29.5 inch low will move from the north shore of Lake Superior tonight to northern Quebec by Thursday night, with a trailing cold front crossing the lake Thursday night and Friday. A 30.5 inch high is then forecast to build into the central Great Lakes Saturday, then drift east to New England by Sunday. The cold front from a 29.4 inch low near James Bay will track across the lake Monday into Tuesday. LOZ062-090900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1010 PM EDT Wed Apr 8 2026 .OVERNIGHT...Southeast winds 10 to 15 knots becoming south 15 to 20 knots. Waves 2 to 3 feet. .THURSDAY...South winds 15 to 25 knots becoming southwest. A chance of showers late. Waves 2 to 4 feet building to 3 to 6 feet. .THURSDAY NIGHT...Southwest winds 15 to 20 knots becoming northwest 5 to 15 knots. A chance of rain showers. Waves 3 to 6 feet subsiding to 1 to 3 feet. .FRIDAY...North winds less than 10 knots. Rain showers. Waves 1 foot or less. .FRIDAY NIGHT...Northwest winds 10 knots or less. Rain showers likely in the evening. Waves 1 foot or less. .SATURDAY...Northwest winds 10 knots or less becoming southeast. Waves 1 foot or less. .SUNDAY...East winds 5 to 15 knots becoming southwest 15 to 20 knots. A chance of rain showers Sunday night. Waves 2 feet or less building to 2 to 4 feet. .MONDAY...Southwest winds 15 to 25 knots increasing to 30 knots. A chance of showers. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ063>065-090900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1010 PM EDT Wed Apr 8 2026 .OVERNIGHT...Southeast winds 15 to 25 knots becoming south. Waves 1 to 3 feet building to 3 to 5 feet. .THURSDAY...South winds 15 to 25 knots. A chance of rain showers late. Waves 3 to 6 feet. .THURSDAY NIGHT...South winds 15 to 25 knots becoming southwest and diminishing to 5 to 10 knots overnight. A chance of rain showers in the evening. Waves 3 to 6 feet subsiding to 1 to 3 feet. .FRIDAY...West winds 10 knots or less becoming north. Rain showers. Waves 2 feet or less. .FRIDAY NIGHT...Northwest winds 10 knots or less. Rain showers in the evening, then a chance of rain showers overnight. Waves 2 feet or less. .SATURDAY...Northwest winds 10 knots or less becoming south. Waves 2 feet or less. .SUNDAY...Southeast winds 5 to 10 knots becoming south and increasing to 15 to 25 knots. A chance of rain showers Sunday night. Waves 1 foot or less building to 3 to 6 feet. .MONDAY...South winds 15 to 25 knots becoming southwest. A chance of showers. Waves 3 to 6 feet. $$ LOZ061-090900- MAFOR 0903/ ONTARIO WEST 1/2 11410 14420 11530 12520. A chance of showers Thursday afternoon. Waves 2 to 3 feet overnight. Waves 2 to 4 feet building to 3 to 6 feet Thursday. Waves 3 to 6 feet Thursday evening. ONTARIO EAST 1/2 11420 15430 11420. Waves 1 to 3 feet building to 3 to 5 feet overnight. Waves 3 to 6 feet Thursday and Thursday evening. $$