FZUS61 KBUF 160203 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1003 PM EDT Thu Oct 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 high pressure ridge averaging 30.1 inches continues to exit eastward from the lake. Elsewhere, a low wobbles northeastward from the southwestern Great Lakes to southern Quebec tonight through Friday and deepens to 29.4 inches. This low track will allow a warm front to sweep northeastward across the lake tonight and a strong cold front to sweep eastward across the lake on Friday. Behind the cold front, a ridge averaging 30.2 inches should affect the lake through this Tuesday as one embedded high pressure center moves from the central Great Plains and vicinity to the Canadian Maritimes on Friday through Monday, and then another embedded and reinforcing high pressure center moves from near Manitoba toward Quebec this Monday through Tuesday. LOZ062-160900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1003 PM EDT Thu Oct 15 2026 .REST OF TONIGHT...East winds 15 to 20 knots becoming southeast 10 to 15 knots. Rain likely late this evening, then rain after midnight. Waves 3 to 5 feet subsiding to 2 to 4 feet. .FRIDAY...Southwest winds 15 to 20 knots becoming northwest and increasing to 30 knots. Rain in the morning, then a chance of rain in the afternoon. Waves 2 to 4 feet building to 5 to 9 feet. Waves occasionally around 11 feet. .FRIDAY NIGHT...Northwest winds to 30 knots becoming north. A chance of rain. Waves 5 to 8 feet. Waves occasionally around 10 feet. .SATURDAY...North winds 15 to 25 knots becoming west and diminishing to 10 to 15 knots. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. .SATURDAY NIGHT...West winds 10 to 15 knots increasing to 15 to 20 knots. Waves 2 to 4 feet building to 3 to 5 feet. .SUNDAY...Southwest winds 15 to 20 knots. Waves 3 to 5 feet. .MONDAY...Southwest winds 5 to 15 knots becoming west. Waves 2 to 4 feet subsiding to 2 feet or less. .TUESDAY...Northwest winds less than 10 knots becoming northeast. Waves 1 foot or less. $$ LOZ063>065-160900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1003 PM EDT Thu Oct 15 2026 .REST OF TONIGHT...East winds 15 to 25 knots becoming southeast to 30 knots. A chance of rain late this evening, then rain after midnight. Waves 1 to 3 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .FRIDAY...South winds to 30 knots becoming west. Rain through early afternoon, then a chance of rain late. Waves 4 to 7 feet building to 6 to 9 feet. Waves occasionally around 11 feet. .FRIDAY NIGHT...Northwest winds to 30 knots becoming north. A chance of rain. Waves 5 to 9 feet. Waves occasionally around 11 feet. .SATURDAY...North winds to 30 knots becoming northwest and diminishing to 10 to 15 knots in the afternoon. Waves 5 to 8 feet subsiding to 2 to 4 feet. Waves occasionally around 10 feet. .SATURDAY NIGHT...West winds 15 to 20 knots. Waves 2 to 4 feet building to 3 to 5 feet. .SUNDAY...Southwest winds 15 to 20 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet. .MONDAY...Southwest winds 15 to 20 knots diminishing to 5 to 15 knots. Waves 2 to 4 feet subsiding to 1 foot or less. .TUESDAY...West winds 10 knots or less becoming northeast. Waves 1 foot or less. $$ LOZ061-160900- MAFOR 1603/ ONTARIO WEST 1/2 11226 11326 11420 11536 11640 11630 11740 11730. Waves 3 to 5 feet subsiding to 2 to 4 feet overnight. Waves 2 to 4 feet building to 6 to 9 feet, and occasionally around 11 feet Friday. Waves 5 to 8 feet, and occasionallyaround 10 feet Friday evening. ONTARIO EAST 1/2 11326 11336 11446 11436 11536 11630 12730. Waves 1 to 3 feet building to 4 to 7 feet, and occasionally around 9 feet overnight. Waves 5 to 8 feet building to 6 to 9 feet, and occasionally around 11 feet Friday. Waves 5 to 9 feet, and occasionally around 11 feet Friday evening. $$