FZUS61 KBUF 020210 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1010 PM EDT Wed Apr 1 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 30.7 inch high will build east across Quebec tonight through Thursday. A 29.6 inch low is then forecast to move into the central Great Lakes Thursday night before reaching southern Quebec Friday afternoon, lifting the frontal boundary to the south back northward over the Lake Thursday evening. A 29.4 inch surface low will track through the central Great Lakes Saturday, then into Quebec Saturday night and Sunday, while dragging a cold front across the lake Saturday night. LOZ062-020900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1010 PM EDT Wed Apr 1 2026 .OVERNIGHT...East winds 10 to 15 knots increasing to 15 to 20 knots. Waves 1 to 2 feet building to 3 to 5 feet. .THURSDAY...East winds 15 to 25 knots. A chance of rain showers late in the morning. Rain showers likely in the afternoon. Waves 4 to 7 feet. Waves occasionally around 9 feet. .THURSDAY NIGHT...East winds 15 to 20 knots becoming south. Rain showers. Waves 4 to 7 feet subsiding to 2 to 4 feet. Waves occasionally around 9 feet. .FRIDAY...Southwest winds 15 to 25 knots. Showers in the morning, then a chance of showers in the afternoon. Waves 2 to 4 feet building to 3 to 6 feet. .FRIDAY NIGHT...West winds 15 to 20 knots becoming northeast 5 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .SATURDAY...East winds 10 to 15 knots becoming southwest 15 to 20 knots. Rain showers likely during the day, then rain showers Saturday night. Waves 1 to 3 feet building to 3 to 6 feet. .SUNDAY...West winds 20 to 25 knots. Rain showers during the day. Waves 5 to 8 feet. Waves occasionally around 10 feet. .MONDAY...West winds 15 to 25 knots becoming north 15 to 20 knots. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. $$ LOZ063>065-020900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1010 PM EDT Wed Apr 1 2026 .OVERNIGHT...Northeast winds 10 to 15 knots increasing to 15 to 20 knots. Waves 1 to 2 feet building to 3 to 5 feet. .THURSDAY...Northeast winds 15 to 20 knots becoming east. A chance of rain showers through early afternoon, then rain showers likely late. Waves 3 to 6 feet. .THURSDAY NIGHT...East winds 15 to 25 knots becoming south to 30 knots. Showers likely. Waves 3 to 5 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .FRIDAY...South winds 15 to 25 knots becoming southwest. Showers likely in the morning, then a chance of showers in the afternoon. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around 9 feet. .FRIDAY NIGHT...West winds 15 to 20 knots becoming north 5 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .SATURDAY...Northeast winds 10 to 15 knots becoming southwest and increasing to 30 knots. Rain showers. Waves 1 to 2 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .SUNDAY...West winds to 30 knots. Rain showers during the day. Waves 5 to 9 feet building to 7 to 10 feet. Waves occasionally around 13 feet. .MONDAY...West winds 15 to 25 knots becoming north. Waves 6 to 9 feet subsiding to 2 to 4 feet. Waves occasionally around 11 feet. $$ LOZ061-020900- MAFOR 0203/ ONTARIO WEST 1/2 12120 11220 12230 11236 11230 11226. Waves 1 to 2 feet building to 3 to 5 feet overnight. Waves 4 to 7 feet, and occasionally around 9 feet Thursday. Waves 4 to 7 feet subsiding to 3 to 5 feet, and occasionally around 9 feet Thursday evening. ONTARIO EAST 1/2 14120 13220 11330. A chance of rain showers Thursday. A chance of showers Thursday evening. Waves 1 to 2 feet building to 3 to 5 feet overnight. Waves 3 to 5 feet Thursday. Waves 3 to 5 feet subsiding to 2 to 4 feet Thursday evening. $$