FZUS61 KBUF 212030 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 430 PM EDT Thu Oct 21 2021 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 29.7 inch low over lower Michigan will track into the Ottawa Valley by early tonight and in the process push its trailing cold front eastward across the lake. Behind the front, a trough averaging 30.0 inches will linger over the lower Great Lakes through Saturday. A 30.2 inch high will stretch from James Bay to the Great Lakes on Sunday. LOZ062-220315- Lake Ontario open waters from the Niagara River to Hamlin Beach- 430 PM EDT Thu Oct 21 2021 .TONIGHT...Southwest winds 15 to 25 knots becoming northwest. A chance of showers early, then showers late this evening. A chance of showers after midnight. Waves 2 to 4 feet building to 5 to 9 feet. Waves occasionally around 11 feet. .FRIDAY...Northwest winds 15 to 20 knots becoming west 10 to 15 knots. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots. Waves 1 to 3 feet. .SATURDAY...North winds 10 knots or less becoming west. A chance of showers in the afternoon. Waves 1 foot or less. .SATURDAY NIGHT...Southwest winds 10 to 15 knots becoming west. A chance of showers in the evening. Waves 1 to 3 feet. .SUNDAY...West winds 15 to 20 knots becoming northeast. Waves 2 to 4 feet. .MONDAY...East winds 15 to 25 knots. A chance of showers. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .TUESDAY...East winds 15 to 20 knots. A chance of showers. Waves 3 to 6 feet. $$ LOZ063>065-220315- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 430 PM EDT Thu Oct 21 2021 .TONIGHT...Southwest winds 10 to 15 knots becoming west and increasing to 30 knots after midnight. Showers through the early overnight, then a chance of showers late. Waves 2 feet or less building to 6 to 10 feet. Waves occasionally around 13 feet. .FRIDAY...Northwest winds 15 to 25 knots becoming west and diminishing to 10 to 15 knots. A chance of showers early. Waves 7 to 10 feet subsiding to 1 to 3 feet. Waves occasionally around 13 feet. .FRIDAY NIGHT...West winds 5 to 15 knots becoming northwest. Waves 1 to 3 feet. .SATURDAY...Northwest winds 5 to 10 knots. A chance of showers in the morning. Waves 1 foot or less. .SATURDAY NIGHT...West winds less than 10 knots increasing to 15 to 20 knots. A chance of showers. Waves 1 foot or less building to 2 to 4 feet. .SUNDAY...West winds 15 to 20 knots becoming northeast. A chance of showers. Waves 2 to 4 feet. .MONDAY...Northeast winds 15 to 20 knots becoming east. A chance of showers. Waves 2 to 4 feet building to 3 to 5 feet. .TUESDAY...East winds 15 to 20 knots becoming northeast. A chance of showers. Waves 3 to 5 feet. $$ LOZ061-220315- MAFOR 2121/ ONTARIO WEST 1/2 11520 11530 11630 12730 11720 11710 11610. A chance of showers tonight. Waves 1 to 3 feet building to 6 to 10 feet, and occasionally around 13 feet tonight. Waves 5 to 8 feet subsiding to 1 to 3 feet, and occasionally around 10 feet Friday. ONTARIO EAST 1/2 11516 11526 11536 11640 11630 11720 11710 11610. Waves 2 feet or less building to 5 to 9 feet, and occasionally around 11 feet tonight. Waves 7 to 10 feet subsiding to 1 to 3 feet, and occasionally around 13 feet Friday. $$