FZUS61 KBUF 152003 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 403 PM EDT Wed Apr 15 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 move into the central Great Lakes tonight before reaching southern Quebec Thursday night, then drift off the New England coast by Friday night. A 30.0 inch high is then forecast to build from the central Great Lakes Friday to the lower Great Lakes Saturday morning, then off the east coast Saturday night. A 29.3 inch surface low to the north of Lake Superior Saturday will deepen to 28.9 inches by Sunday, with a trailing cold front crossing the Lake Saturday night. A 30.4 inch surface high will push from the Plains to the Upper Ohio Valley from Sunday through Monday. LOZ062-160300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 403 PM EDT Wed Apr 15 2026 .TONIGHT...Southwest winds 10 to 15 knots. A chance of showers and thunderstorms this evening, then showers with a chance of thunderstorms after midnight. Waves 1 to 3 feet. .THURSDAY...South winds 10 to 15 knots becoming southwest 15 to 20 knots. A chance of showers in the morning, then showers likely in the afternoon. Waves 1 to 3 feet. .THURSDAY NIGHT...Southwest winds 15 to 20 knots becoming west and diminishing to around 10 knots. Showers likely in the evening, then a chance of showers overnight. Waves 1 to 3 feet. .FRIDAY...Northwest winds 10 knots or less becoming southeast. A chance of showers in the morning. Waves 2 feet or less. .FRIDAY NIGHT...East winds 10 knots or less. Waves 1 foot or less. .SATURDAY...Southeast winds 10 to 15 knots becoming west 15 to 20 knots. Showers likely. Waves 2 feet or less building to 3 to 6 feet. .SUNDAY...West winds 15 to 25 knots becoming northwest. A chance of rain and snow showers during the day, then a chance of rain showers Sunday night. Waves 5 to 8 feet. Waves occasionally around 10 feet. .MONDAY...Northwest winds 15 to 25 knots becoming southwest and diminishing to 10 to 15 knots. Waves 4 to 7 feet subsiding to 2 to 3 feet. Waves occasionally around 9 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-160300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 403 PM EDT Wed Apr 15 2026 .TONIGHT...South winds 5 to 10 knots. A chance of showers through the early overnight, then showers likely late. Waves 2 feet or less. .THURSDAY...South winds 5 to 10 knots becoming southwest. Showers. Waves 2 feet or less. .THURSDAY NIGHT...Southwest winds 5 to 10 knots becoming west. Showers in the evening, then showers likely overnight. Waves 2 feet or less. .FRIDAY...Northwest winds 5 to 10 knots becoming west. A chance of showers in the morning. Waves 2 feet or less. .FRIDAY NIGHT...Northwest winds 10 knots or less becoming southeast. Waves 1 foot or less. .SATURDAY...Southeast winds 15 to 25 knots becoming southwest. Showers likely. Waves 1 to 3 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .SUNDAY...West winds to 30 knots becoming northwest. Rain showers likely during the day, then a chance of rain and snow showers Sunday night. Waves 5 to 9 feet building to 7 to 10 feet. Waves occasionally around 13 feet. .MONDAY...Northwest winds 15 to 25 knots becoming west. Waves 5 to 9 feet subsiding to 3 to 5 feet. Waves occasionally around 11 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-160300- MAFOR 1521/ ONTARIO WEST 1/2 11510 12400 11500 11410 12510 11516. Waves 1 to 3 feet. ONTARIO EAST 1/2 11500 11300 12400 11406 12400 11406. Waves 2 feet or less. $$