FZUS61 KBUF 090810 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 410 AM EDT Thu Apr 9 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 drift southeast of Nova Scotia today. A 29.5 inch low will move across James Bay today to northern Quebec tonight, with a trailing cold front crossing the lake tonight through 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 approach the lake Monday and then stall nearby into Tuesday. LOZ062-091500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 410 AM EDT Thu Apr 9 2026 .TODAY...South winds 10 to 15 knots becoming southwest 15 to 20 knots. A chance of showers late. Waves 1 to 2 feet building to 3 to 5 feet. .TONIGHT...Southwest winds 15 to 20 knots becoming north 5 to 15 knots. A chance of rain showers late. Waves 3 to 5 feet subsiding to 1 to 3 feet. .FRIDAY...North winds 5 to 10 knots becoming northwest. Rain showers. Waves around 1 foot. .FRIDAY NIGHT...Northwest winds around 10 knots. Rain showers in the evening. Waves 1 to 2 feet. .SATURDAY...Northwest winds 10 knots or less becoming southeast. Waves 2 feet or less. .SUNDAY...East winds 5 to 10 knots becoming southwest and increasing to 15 to 25 knots. A chance of rain showers. Waves 1 foot or less building to 3 to 6 feet. .MONDAY...Southwest winds to 30 knots diminishing to 15 to 25 knots. A chance of showers. Waves 4 to 7 feet building to 5 to 9 feet, then subsiding to 4 to 6 feet. Waves occasionally around 11 feet. $$ LOZ063>065-091500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 410 AM EDT Thu Apr 9 2026 .TODAY...South winds 15 to 25 knots. A chance of rain showers late. Waves 3 to 6 feet. .TONIGHT...South winds 15 to 20 knots becoming west 10 to 15 knots. A chance of showers in the evening. Waves 3 to 5 feet subsiding to 1 to 3 feet. .FRIDAY...West winds 5 to 10 knots becoming northwest. Rain showers. Waves 1 to 2 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots. Rain showers in the evening, then a chance of rain showers overnight. Waves 2 feet or less. .SATURDAY...Northwest winds 5 to 15 knots becoming south less than 10 knots. Waves 2 feet or less. .SUNDAY...Southeast winds 5 to 15 knots becoming south and increasing to 30 knots. A chance of rain showers. Waves 2 feet or less building to 4 to 7 feet. Waves occasionally around 9 feet. .MONDAY...Southwest winds 15 to 25 knots. Showers likely. Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally around 10 feet. $$ LOZ061-091500- MAFOR 0909/ ONTARIO WEST 1/2 11410 12420 12520 11510 11600 11700. A chance of showers this afternoon. Waves 1 to 3 feet building to 3 to 5 feet today. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight. ONTARIO EAST 1/2 13430 14420 11510. A chance of showers this evening. Waves 3 to 6 feet today. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight. $$