FZUS61 KBUF 080209 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1009 PM EDT Tue Apr 7 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 29.9 inch clipper low will move off the New England coast this evening. A 30.6 inch high will then build over the lower Great Lakes tonight, then east across New England Wednesday before moving southeast of Nova Scotia Thursday. A 29.5 inch low will then move from the north shore of Lake Superior Wednesday night 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. LOZ062-080900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1009 PM EDT Tue Apr 7 2026 .OVERNIGHT...North winds 5 to 15 knots becoming northeast less than 10 knots. Waves 1 to 3 feet subsiding to 1 foot or less. .WEDNESDAY...Southeast winds 5 to 15 knots becoming east. Waves 2 feet or less. .WEDNESDAY NIGHT...East winds 10 to 15 knots becoming south 15 to 20 knots. Waves 2 to 4 feet building to 3 to 5 feet. .THURSDAY...South winds 15 to 25 knots becoming southwest. A chance of showers in the afternoon. Waves 3 to 6 feet. .THURSDAY NIGHT...Southwest winds 15 to 20 knots becoming northwest and diminishing to 5 to 10 knots. A chance of rain showers. Waves 3 to 6 feet subsiding to 1 to 2 feet. .FRIDAY...North winds 5 to 10 knots becoming northwest. Rain showers. Waves 2 feet or less. .SATURDAY...Northwest winds 10 knots or less becoming southeast. Waves 1 foot or less. .SUNDAY...Southeast winds 5 to 10 knots becoming southwest and increasing to 15 to 20 knots. A chance of rain showers. Waves 2 feet or less building to 3 to 5 feet. $$ LOZ063>065-080900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1009 PM EDT Tue Apr 7 2026 .OVERNIGHT...Northwest winds 5 to 15 knots. Waves 3 to 5 feet subsiding to 2 feet or less. .WEDNESDAY...Southwest winds 10 knots or less becoming east 10 to 15 knots. Waves 2 feet or less. .WEDNESDAY NIGHT...East winds 10 to 15 knots becoming south and increasing to 30 knots overnight. Waves 1 to 3 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .THURSDAY...South winds to 30 knots diminishing to 15 to 25 knots. A chance of rain showers in the afternoon. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around 9 feet. .THURSDAY NIGHT...South winds 15 to 20 knots becoming west 5 to 15 knots. A chance of rain showers in the evening. Waves 3 to 6 feet subsiding to 1 to 3 feet. .FRIDAY...North winds 5 to 15 knots becoming northwest. Rain showers likely. Waves 1 to 3 feet. .SATURDAY...Northwest winds 5 to 15 knots becoming south less than 10 knots. Waves 2 feet or less. .SUNDAY...Southeast winds 5 to 10 knots becoming south and increasing to 15 to 25 knots. A chance of rain showers Sunday night. Waves 2 feet or less building to 3 to 6 feet. $$ LOZ061-080900- MAFOR 0803/ ONTARIO WEST 1/2 11710 11800 11400 11300 11200 12210 11310. Waves 1 to 3 feet overnight. Waves 2 feet or less Wednesday. Waves 2 to 3 feet Wednesday evening. ONTARIO EAST 1/2 11710 11700 11600 11400 11300 11200 11210 11320. Waves 2 to 4 feet subsiding to 2 feet or less overnight. Waves 2 feet or less Wednesday. Waves 1 to 3 feet Wednesday evening. $$