FZUS61 KBUF 151410 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1009 AM 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 weaken to around 29.8 as it slides east across the lake early this morning. Another 29.6 inch low will move into the central Great Lakes Wednesday night 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. LOZ062-152100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1009 AM EDT Wed Apr 15 2026 .REST OF TODAY...Southwest winds 10 to 15 knots. Patchy fog. A chance of showers and thunderstorms late. Waves 1 to 3 feet. .TONIGHT...Southwest winds 10 to 15 knots becoming south. Patchy fog. A chance of showers and thunderstorms in the evening. Showers likely late. Waves 1 to 3 feet. .THURSDAY...South winds 10 to 15 knots becoming southwest. Patchy fog. Showers likely in the morning, then showers with a chance of thunderstorms in the afternoon. Waves 1 to 3 feet. .THURSDAY NIGHT...Southwest winds 10 to 15 knots becoming west. Patchy fog in the evening. Showers in the evening, then showers likely overnight. Waves 1 to 3 feet. .FRIDAY...Northwest winds 10 knots or less becoming southeast. A chance of showers during the day. Waves 1 foot or less. .SATURDAY...Southeast winds 5 to 10 knots becoming west and increasing to 15 to 20 knots. Showers likely. Waves 1 foot or less building to 3 to 6 feet. .SUNDAY...West winds 20 to 25 knots becoming northwest. A chance of rain showers. Waves 5 to 8 feet. Waves occasionally around 10 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-152100- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1009 AM EDT Wed Apr 15 2026 .REST OF TODAY...South winds 5 to 10 knots becoming west. A chance of showers late this morning. Patchy fog. Waves 2 feet or less. .TONIGHT...South winds 5 to 10 knots. Patchy fog. A chance of showers through the early overnight, then showers likely late. Waves 2 feet or less. .THURSDAY...South winds 5 to 10 knots becoming southwest. Patchy fog. Showers likely in the morning, then showers with a chance of thunderstorms in the afternoon. Waves 1 to 2 feet. .THURSDAY NIGHT...Southwest winds 5 to 10 knots becoming west. Patchy fog in the evening. Showers with a chance of thunderstorms in the evening, then showers likely overnight. Waves 1 to 2 feet. .FRIDAY...Northwest winds 10 knots or less becoming southeast. A chance of showers during the day. Waves 1 foot or less. .SATURDAY...Southeast winds 5 to 15 knots becoming southwest and increasing to 15 to 25 knots. Showers likely. Waves 1 foot or less building to 4 to 7 feet. Waves occasionally around 9 feet. .SUNDAY...West winds to 30 knots. A chance of rain showers. Waves 5 to 9 feet building to 7 to 10 feet. Waves occasionally around 13 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-152100- MAFOR 1515/ ONTARIO WEST 1/2 15510 12416. Waves 1 to 3 feet. ONTARIO EAST 1/2 11500 11600 11500 11400 11500 12400 11406. Waves 2 feet or less. $$