FZUS61 KBUF 160809 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 409 AM EDT Thu Apr 16 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 across the central Great Lakes today before reaching southern Quebec tonight, 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. The high is expected to move off the Mid-Atlantic coast Tuesday. LOZ062-161500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 409 AM EDT Thu Apr 16 2026 .TODAY...Southwest winds 10 to 15 knots increasing to 15 to 20 knots. Patchy fog this morning. A chance of showers early, then showers likely late this morning. Showers with a chance of thunderstorms this afternoon. Waves 1 to 3 feet building to 2 to 4 feet. .TONIGHT...Southwest winds 15 to 20 knots becoming northwest and diminishing to 5 to 10 knots. Showers likely with a chance of thunderstorms early, then a chance of showers. Patchy fog from late evening on. Waves 2 to 4 feet subsiding to 1 to 2 feet. .FRIDAY...Northwest winds 10 knots or less becoming south. Patchy fog in the morning. Waves 1 foot or less. .FRIDAY NIGHT...Southeast winds 10 knots or less becoming east. Waves 1 foot or less. .SATURDAY...Southeast winds 10 to 15 knots becoming west 15 to 20 knots. Showers. Waves 2 feet or less building to 2 to 4 feet. .SUNDAY...West winds 15 to 25 knots becoming northwest. A chance of rain showers. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .MONDAY...Northwest winds 15 to 25 knots becoming southwest and diminishing to 10 to 15 knots. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-161500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 409 AM EDT Thu Apr 16 2026 .TODAY...Southwest winds 5 to 15 knots. Patchy dense fog this morning. A chance of showers early, then showers late this morning. Showers with a chance of thunderstorms this afternoon. Some thunderstorms may produce gusty winds late. Waves 1 to 3 feet. .TONIGHT...Southwest winds 5 to 15 knots becoming northwest. Showers with a chance of thunderstorms early, then showers likely late in the evening. A chance of showers after midnight. Patchy fog from late evening on. Some thunderstorms may produce gusty winds early. Waves 1 to 3 feet. .FRIDAY...Northwest winds 10 knots or less becoming west. Patchy fog in the morning. Waves 2 feet or less. .FRIDAY NIGHT...Southwest winds 10 knots or less becoming southeast. Waves 1 foot or less. .SATURDAY...Southeast winds 10 to 15 knots becoming west 15 to 20 knots. Showers likely. Waves 1 to 3 feet building to 3 to 5 feet. .SUNDAY...West winds 15 to 25 knots becoming northwest to 30 knots. Rain showers likely during the day, then a chance of rain showers Sunday night. Waves 3 to 6 feet building to 5 to 9 feet. Waves occasionally around 11 feet. .MONDAY...Northwest winds 15 to 25 knots becoming west. Waves 5 to 9 feet subsiding to 3 to 5 feet. Waves occasionally around 11 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-161500- MAFOR 1609/ ONTARIO WEST 1/2 11500 11410 11510 11526 11516 11610 11600 11700. A chance of thunderstorms this afternoon and evening. Waves 1 to 3 feet building to 2 to 4 feet today. Waves 2 to 4 feet subsiding to 1 to 2 feet tonight. ONTARIO EAST 1/2 11500 19504 11400 19404 11400 12516 11510 11600 11700. A chance of thunderstorms this afternoon and evening. Waves 2 feet or less today. Waves 1 to 3 feet tonight. $$