FZUS61 KBUF 152002 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 PM EDT Fri May 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 30.1 inch high will slide off the Carolina coast tonight. A 29.1 inch low well to the north over Hudson Bay will swing a warm front across the lower Great Lakes tomorrow, with an attendant cold front approaching and stalling near the Lake Saturday night. A 29.4 inch low over the central Plains on Sunday will weaken to 29.7 inches as it moves northeast into the upper Great Lakes Sunday night while swinging an attendant warm front across the lake. Another area of low pressure will develop over the Central Plains Monday. The low will weaken from 29.4 inches to 29.6 inches as it tracks northeast to the Upper Great Lakes Monday night into Tuesday morning, then to near the southern tip of James Bay on Tuesday. A cold front from this low will cross the Lake Wednesday. LOZ062-160300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 PM EDT Fri May 15 2026 .TONIGHT...Southwest winds 5 to 15 knots becoming south. Waves 1 to 2 feet. .SATURDAY...South winds 10 to 15 knots becoming southwest 15 to 20 knots. A chance of showers in the afternoon. Waves 1 to 3 feet building to 3 to 5 feet. .SATURDAY NIGHT...Southwest winds 15 to 20 knots becoming west 5 to 15 knots. A chance of showers in the evening. Waves 3 to 5 feet subsiding to 1 to 3 feet. .SUNDAY...West winds 10 knots or less becoming south. Waves 2 feet or less. .SUNDAY NIGHT...Southeast winds 10 knots or less becoming east. Waves 1 foot or less. .MONDAY...Southeast winds 5 to 15 knots becoming southwest. A chance of showers Monday night. Waves 2 feet or less. .TUESDAY...Southwest winds 15 to 20 knots. A chance of showers during the day, then showers likely with a chance of thunderstorms Tuesday night. Waves 1 to 3 feet building to 3 to 5 feet. .WEDNESDAY...West winds 15 to 20 knots becoming northwest 10 to 15 knots. Showers likely during the day. Waves 2 to 4 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-160300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 PM EDT Fri May 15 2026 .TONIGHT...Southwest winds 5 to 10 knots becoming south. Waves 1 to 2 feet. .SATURDAY...South winds 5 to 15 knots becoming southwest. A chance of showers early in the afternoon. Showers likely with a chance of thunderstorms late. Waves 2 feet or less. .SATURDAY NIGHT...Southwest winds 5 to 15 knots becoming west. A chance of showers and thunderstorms in the evening, then a chance of showers overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet. .SUNDAY...West winds 5 to 10 knots. Waves 2 feet or less. .SUNDAY NIGHT...South winds 10 knots or less becoming east. Waves 1 foot or less. .MONDAY...Southeast winds 10 to 15 knots becoming south. Waves 2 feet or less. .TUESDAY...Southwest winds 10 to 15 knots. A chance of showers and thunderstorms during the day, then showers likely with a chance of thunderstorms Tuesday night. Waves 1 to 3 feet building to 2 to 4 feet. .WEDNESDAY...Southwest winds 10 to 15 knots becoming west. Showers likely during the day. Waves 2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to 4 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-160300- MAFOR 1521/ ONTARIO WEST 1/2 13510 12400 11410 12520. A chance of showers Saturday afternoon. Waves 1 to 2 feet tonight. Waves 1 to 3 feet building to 2 to 4 feet Saturday. ONTARIO EAST 1/2 12500 12400 13410 11510. A chance of showers Saturday afternoon. Waves 1 to 2 feet. $$