FZUS61 KBUF 040211 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1010 PM EDT Fri Apr 3 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 30.6 inch high will ridge south across the lake as it slides east from lower Hudson Bay to central Quebec tonight. A 29.4 inch surface low will track through the central Great Lakes Saturday, then into Quebec Saturday night and Sunday, while dragging a strong cold front across the lake Saturday night, with a secondary cold front then following Sunday night and Monday. A 30.5 inch high will then build across the Great Lakes Tuesday and Tuesday night, before sliding east and off the New England coast Wednesday. LOZ062-040900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1010 PM EDT Fri Apr 3 2026 .OVERNIGHT...Northwest winds 5 to 15 knots becoming north. Waves 2 to 4 feet subsiding to 1 to 3 feet. .SATURDAY...East winds 10 to 15 knots increasing to 15 to 25 knots. A chance of rain showers from late morning on. Waves 1 to 2 feet building to 3 to 6 feet. .SATURDAY NIGHT...East winds 15 to 20 knots becoming southwest. Showers. Waves 3 to 5 feet. .SUNDAY...West winds 15 to 25 knots. Rain showers likely in the morning. Waves 3 to 6 feet building to 5 to 8 feet. Waves occasionally around 10 feet. .SUNDAY NIGHT...West winds 15 to 25 knots. Waves 5 to 8 feet. Waves occasionally around 10 feet. .MONDAY...West winds 15 to 25 knots becoming northwest. A chance of rain and snow showers Monday night. Waves 3 to 6 feet subsiding to 3 to 5 feet. .TUESDAY...Northwest winds 15 to 25 knots diminishing to 5 to 15 knots. A chance of snow showers during the day. Waves 3 to 6 feet subsiding to 1 to 3 feet. .WEDNESDAY...South winds 5 to 10 knots increasing to 30 knots. Waves 1 to 3 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ063>065-040900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1010 PM EDT Fri Apr 3 2026 .OVERNIGHT...Northwest winds 5 to 15 knots becoming north. Waves 3 to 5 feet subsiding to 1 to 3 feet. .SATURDAY...Northeast winds 10 to 15 knots becoming east 15 to 20 knots. A chance of rain showers early in the afternoon. Rain showers likely late. Waves 1 to 3 feet building to 2 to 4 feet. .SATURDAY NIGHT...East winds 15 to 25 knots becoming southwest to 30 knots. Showers. Waves 2 to 4 feet building to 5 to 8 feet. Waves occasionally around 10 feet. .SUNDAY...West winds 15 to 25 knots increasing to 30 knots. Rain showers in the morning, then a chance of rain showers in the afternoon. Waves 3 to 6 feet building to 7 to 10 feet. Waves occasionally around 13 feet. .SUNDAY NIGHT...West winds to 30 knots. Waves 6 to 10 feet. Waves occasionally around 13 feet. .MONDAY...West winds 15 to 25 knots. A chance of snow and rain showers Monday night. Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally around 10 feet. .TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 15 knots. A chance of snow showers during the day. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. .WEDNESDAY...South winds 5 to 10 knots increasing to 30 knots. Waves 1 to 2 feet building to 6 to 9 feet. Waves occasionally around 11 feet. $$ LOZ061-040900- MAFOR 0403/ ONTARIO WEST 1/2 11710 11800 11110 11220 12230 11220 11316. Waves 2 to 4 feet subsiding to 1 to 3 feet overnight. Waves 1 to 2 feet building to 3 to 6 feet Saturday. Waves 3 to 5 feet Saturday evening. ONTARIO EAST 1/2 11710 11700 11100 12110 12220 11346. Waves 2 to 4 feet subsiding to 1 to 3 feet overnight. Waves 1 to 3 feet building to 2 to 4 feet Saturday. Waves 2 to 4 feet building to 3 to 6 feet Saturday evening. $$