FZUS61 KBUF 241410 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1009 AM EDT Tue Mar 24 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 30.4 inch high centered over the Ohio Valley this afternoon will drift off the Mid Atlantic coast tonight, while a 30.3 inch high over Quebec ridges south across the lake tonight into Wednesday. A weak 29.7 inch low over the central Great Lakes Wednesday night will pass north of the lake on Thursday, then to the Gulf of Saint Lawrence by early Friday, with a trailing cold front crossing the lake Thursday evening. A large 30.7 inch high will then build cross the Great Lakes region Friday through Sunday. LOZ062-242100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1009 AM EDT Tue Mar 24 2026 .THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves 1 to 3 feet. .TONIGHT...Southwest winds 5 to 15 knots. Waves 1 to 3 feet. .WEDNESDAY...South winds 5 to 10 knots becoming east. Waves 1 foot or less. .WEDNESDAY NIGHT...East winds 5 to 10 knots becoming south. Waves around 1 foot. .THURSDAY...Southwest winds 10 to 15 knots becoming northwest 15 to 20 knots. Rain showers likely. Waves 1 to 2 feet building to 3 to 5 feet. .FRIDAY...North winds 15 to 20 knots becoming northwest. Waves 3 to 5 feet subsiding to 2 to 4 feet. .SATURDAY...West winds 15 to 20 knots. Waves 2 to 4 feet building to 3 to 6 feet. $$ LOZ063-064-242100- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 1009 AM EDT Tue Mar 24 2026 .THIS AFTERNOON...West winds 10 knots or less increasing to 10 to 15 knots. Waves 2 feet or less. .TONIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet. .WEDNESDAY...South winds 5 to 10 knots becoming east. Waves 2 feet or less. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots becoming south. A chance of rain showers overnight. Waves 2 feet or less. .THURSDAY...South winds 10 to 15 knots becoming northwest 15 to 20 knots. Rain showers likely. Waves 1 to 3 feet building to 3 to 6 feet. .FRIDAY...North winds 15 to 20 knots becoming northwest. Waves 3 to 6 feet subsiding to 2 to 4 feet. .SATURDAY...West winds 15 to 25 knots. Waves 2 to 4 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ065-242100- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 1009 AM EDT Tue Mar 24 2026 .THIS AFTERNOON...West winds 5 to 15 knots becoming southwest. Waves 2 feet or less. .TONIGHT...Southwest winds 5 to 15 knots becoming west. Waves 1 to 3 feet. .WEDNESDAY...North winds 5 to 10 knots becoming southeast. Waves 2 feet or less. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots becoming south. A chance of rain showers. Waves 2 feet or less. .THURSDAY...South winds 10 to 15 knots becoming northwest 15 to 20 knots. Rain showers likely. Waves 1 to 3 feet building to 3 to 5 feet. .FRIDAY...North winds 15 to 25 knots diminishing to 10 to 15 knots. Waves 3 to 5 feet subsiding to 2 feet or less. .SATURDAY...West winds 10 to 15 knots increasing to 15 to 20 knots. Waves 1 to 3 feet building to 3 to 6 feet. $$ LOZ061-242100- MAFOR 2415/ ONTARIO WEST 1/2 11510 11610 13510 11600 11500 11300. Waves 1 to 3 feet this afternoon and tonight. Waves 2 feet or less Wednesday morning. ONTARIO EAST 1/2 11500 14610 12600 11300. Waves 2 feet or less this afternoon. Waves 1 to 3 feet tonight. Waves 2 feet or less Wednesday morning. $$