FZUS61 KBUF 230209 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1008 PM EDT Wed Apr 22 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 30.0 inch high will build across the Great Lakes tonight and tomorrow. A warm front will approach the lake Friday, this from a 29.6 inch area of low pressure that will advance across the Great Lakes region, though remaining south of the Lake. This low will move towards Delmarva Saturday. A 30.2 inch area of high pressure will build across the lower Great Lakes Saturday night and Sunday. A 29.4 inch area of low pressure will advance from the Central Plains Sunday night to the western Great Lakes Monday night. LOZ062-230900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1008 PM EDT Wed Apr 22 2026 .OVERNIGHT...Northwest winds less than 10 knots becoming west. Waves 1 foot or less. .THURSDAY...North winds less than 10 knots becoming southeast. Waves 1 foot or less. .THURSDAY NIGHT...Southeast winds 10 knots or less becoming east 10 to 15 knots. Waves 2 feet or less. .FRIDAY...East winds 15 to 20 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. A chance of showers overnight. Waves 1 to 3 feet building to 3 to 5 feet. .SATURDAY...East winds 15 to 20 knots becoming northeast and diminishing to around 10 knots. Showers likely during the day, then a chance of showers Saturday night. Waves 3 to 6 feet subsiding to 1 to 3 feet. .SUNDAY...North winds 10 knots or less becoming east. Waves 2 feet or less. .MONDAY...East winds 5 to 15 knots becoming southeast 15 to 20 knots. A chance of showers Monday night. Waves 1 foot or less building to 2 to 4 feet. $$ LOZ063>065-230900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1008 PM EDT Wed Apr 22 2026 .OVERNIGHT...Southwest winds 10 knots or less becoming northwest. Waves 1 foot or less. .THURSDAY...North winds 5 to 10 knots becoming southwest. Waves 1 foot or less. .THURSDAY NIGHT...Southwest winds 10 knots or less becoming northeast 10 to 15 knots. Waves 2 feet or less. .FRIDAY...Northeast winds 5 to 15 knots. Waves 2 feet or less. .FRIDAY NIGHT...Northeast winds 5 to 15 knots becoming east. A chance of showers overnight. Waves 1 to 3 feet. .SATURDAY...East winds 15 to 20 knots diminishing to 5 to 15 knots. A chance of showers. Waves 2 to 4 feet subsiding to 1 to 3 feet. .SUNDAY...North winds 10 knots or less becoming east. Waves 1 foot or less. .MONDAY...East winds 5 to 15 knots becoming southeast 15 to 20 knots. A chance of showers Monday night. Waves 1 to 3 feet building to 2 to 4 feet. $$ LOZ061-230900- MAFOR 2303/ ONTARIO WEST 1/2 12600 11700 11100 11200 12300 11100. Waves 1 foot or less. ONTARIO EAST 1/2 11600 11700 12800 11700 11600 11500 11800. Waves 1 foot or less. $$