FZUS61 KBUF 242050 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 450 PM EDT Fri Apr 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 29.6 inch low will slightly weaken to 29.7 inches as it passes just southwest of Lake tonight, while nudging a warm front a bit further east over the Lake. The low then slide southeast into the mid Atlantic region Saturday forcing the front back to the southwest of the Lake. A 30.2 inch area of high pressure will build across the lower Great Lakes Saturday night through Monday. A 29.4 inch area of low pressure over the Great Plains Monday night, will advance northeast into the upper Great Lakes later Monday night into Tuesday morning while pushing an attendant warm front across the Lake before heading northeast to James Bay Tuesday night sending an attendant cold front across the Lake. LOZ062-250300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 450 PM EDT Fri Apr 24 2026 .TONIGHT...East winds 15 to 20 knots. A chance of rain showers. Rain showers late. Waves 2 to 4 feet building to 3 to 5 feet. .SATURDAY...East winds 20 to 25 knots. Rain showers in the morning, then a chance of rain showers in the afternoon. Waves 4 to 7 feet building to 5 to 9 feet. Waves occasionally around 11 feet. .SATURDAY NIGHT...East winds 15 to 20 knots becoming northeast 10 to 15 knots. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. .SUNDAY...Northeast winds 5 to 15 knots becoming east. Waves 2 feet or less. .SUNDAY NIGHT...East winds 10 knots or less. Waves 1 foot or less. .MONDAY...East winds 5 to 15 knots becoming southeast. Waves 2 feet or less. .TUESDAY...Southeast winds 10 to 15 knots becoming southwest. Showers likely. Waves 1 to 3 feet. .WEDNESDAY...West winds 5 to 10 knots becoming northwest. A chance of showers. Waves 1 to 2 feet. $$ LOZ063>065-250300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 450 PM EDT Fri Apr 24 2026 .TONIGHT...Northeast winds 5 to 15 knots becoming east 15 to 20 knots. A chance of rain showers late. Waves 1 to 3 feet building to 2 to 4 feet. .SATURDAY...East winds 15 to 20 knots becoming northeast. A chance of showers early, then showers likely. A chance of showers late. Waves 3 to 6 feet. .SATURDAY NIGHT...East winds 15 to 20 knots diminishing to 5 to 15 knots. A chance of showers in the evening. Waves 2 to 4 feet subsiding to 1 foot or less. .SUNDAY...Northeast winds 5 to 10 knots becoming north. Waves 1 foot or less. .SUNDAY NIGHT...North winds less than 10 knots becoming northeast. Waves 1 foot or less. .MONDAY...Northeast winds 10 knots or less becoming southeast 10 to 15 knots. Waves 2 feet or less. .TUESDAY...Southeast winds 15 to 20 knots becoming south. A chance of showers. Waves 1 to 3 feet building to 2 to 4 feet. .WEDNESDAY...Southwest winds 5 to 15 knots becoming west. A chance of showers. Waves 1 to 3 feet. $$ LOZ061-250300- MAFOR 2421/ ONTARIO WEST 1/2 14220 12236 12230. Waves 2 to 4 feet building to 3 to 5 feet tonight. Waves 4 to 7 feet building to 5 to 9 feet, and occasionally around 11 feet Saturday. ONTARIO EAST 1/2 12100 11210 13220 12120. A chance of showers Saturday. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet Saturday. $$