FZUS61 KBUF 271413 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1013 AM EDT Fri Mar 27 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 strong 30.6 inch high will build from the northern Plains this afternoon to the Ohio Valley by Saturday afternoon, then off the Mid Atlantic coast Sunday. A 30.0 inch trough will sag southward across eastern Canada Monday, then move across the eastern Great Lakes Monday night, followed by a deeper 29.5 inch low Tuesday night into early Wednesday. LOZ062-272100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1013 AM EDT Fri Mar 27 2026 .THIS AFTERNOON...North winds 5 to 15 knots becoming northwest. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TONIGHT...Northwest winds 5 to 15 knots. Waves 1 to 3 feet. .SATURDAY...Northwest winds 10 to 15 knots becoming west 15 to 20 knots. Waves 2 to 4 feet. .SATURDAY NIGHT...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 2 to 4 feet. .SUNDAY...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 2 to 4 feet. .MONDAY...Southwest winds 10 to 15 knots becoming northeast 15 to 20 knots. A chance of rain showers Monday night. Waves 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots becoming southwest. Rain showers likely. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ063-064-272100- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 1013 AM EDT Fri Mar 27 2026 .THIS AFTERNOON...North winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 3 to 6 feet subsiding to 1 to 3 feet. .TONIGHT...Northwest winds 5 to 15 knots becoming north. Waves 1 to 3 feet. .SATURDAY...Northwest winds 10 to 15 knots becoming west 15 to 20 knots. A chance of snow showers. Waves 1 to 3 feet building to 3 to 6 feet. .SATURDAY NIGHT...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 3 to 6 feet subsiding to 2 to 4 feet. .SUNDAY...South winds 10 to 15 knots becoming southwest. Waves 1 to 3 feet. .MONDAY...Southwest winds 5 to 10 knots becoming northeast and increasing to 15 to 20 knots. A chance of rain showers Monday night. Waves 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots becoming south. Rain showers likely. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ065-272100- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 1013 AM EDT Fri Mar 27 2026 .THIS AFTERNOON...North winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TONIGHT...North winds around 10 knots. Waves 2 feet or less. .SATURDAY...North winds 5 to 10 knots becoming west and increasing to 15 to 20 knots. Waves 1 foot or less building to 3 to 5 feet. .SATURDAY NIGHT...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet. .SUNDAY...South winds 10 to 15 knots becoming southwest. Waves 1 to 3 feet. .MONDAY...Southwest winds 5 to 10 knots becoming northeast and increasing to 15 to 20 knots. A chance of rain showers Monday night. Waves 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots becoming south. Rain showers. Waves 1 to 3 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ061-272100- MAFOR 2715/ ONTARIO WEST 1/2 11810 11800 11700 14710 11610. Waves 2 to 4 feet subsiding to 1 to 3 feet this afternoon. Waves 1 to 3 feet tonight and Saturday morning. ONTARIO EAST 1/2 11820 11810 12700 13810 11710. A chance of snow showers Saturday morning. Waves 3 to 5 feet subsiding to 1 to 3 feet this afternoon. Waves 1 to 3 feet tonight and Saturday morning. $$