FZUS61 KBUF 132003 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 403 PM EDT Fri Mar 13 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 29.2 inch low over northern Lower Michigan will move to the Ottawa Valley tonight while weakening to 29.5 inches. This low will continue east to the Canadian Maritimes Saturday as a 30.3 inch high builds into the lower Great Lakes. A 30.3 inch high will then ridge across the lake Saturday night, before moving east of the lake Sunday. Meanwhile, a 29.5 inch surface low over the mid Mississippi Valley Sunday morning will track northeastward and deepen to 28.9 inches just to the west of the lake Monday morning, before pushing northeastward across Quebec through the remainder of Monday and Tuesday. This low will sweep a strong cold front across the lake Monday afternoon, with a 30.3 inch high then building across the Great Lakes and Ohio Valley Tuesday. The high will then shift east of the lake Wednesday and reach the East Coast by Wednesday evening. LOZ062-140300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 403 PM EDT Fri Mar 13 2026 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...South winds to 30 knots becoming west and increasing to 40 knot gales after midnight. Rain and snow showers. Waves 4 to 7 feet building to 12 to 16 feet. Waves occasionally around 20 feet. .SATURDAY...West gales to 35 knots diminishing to 30 knots. Snow and rain showers likely early. Waves 12 to 16 feet subsiding to 7 to 10 feet. Waves occasionally around 20 feet. .SATURDAY NIGHT...Northwest winds 15 to 25 knots becoming east and diminishing to 10 to 15 knots. A chance of snow overnight. Waves 5 to 8 feet subsiding to 1 foot or less. Waves occasionally around 10 feet. .SUNDAY...East winds 15 to 25 knots. Snow likely in the morning, then rain and snow likely in the afternoon. Waves 1 to 3 feet building to 5 to 8 feet. Waves occasionally around 10 feet. .SUNDAY NIGHT...Southeast winds to 30 knots becoming south. A chance of showers overnight. Waves 5 to 8 feet. Waves occasionally around 10 feet. .MONDAY...Southeast winds to 30 knots becoming west and increasing to 40 knot gales. Rain and snow showers. Waves 5 to 8 feet building to 11 to 16 feet. Waves occasionally around 20 feet. .TUESDAY...West gales to 35 knots diminishing to 15 to 25 knots. Waves 12 to 16 feet subsiding to 6 to 9 feet. Waves occasionally around 20 feet. .WEDNESDAY...West winds 15 to 20 knots becoming south. A chance of snow and rain showers Wednesday night. Waves 3 to 6 feet subsiding to 1 to 3 feet. $$ LOZ063>065-140300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 403 PM EDT Fri Mar 13 2026 ...GALE WARNING IN EFFECT THROUGH SATURDAY AFTERNOON... .TONIGHT...South winds to 30 knots becoming southwest and increasing to 35 knot gales after midnight. Rain and snow early, then snow and rain showers from late evening on. Waves 5 to 8 feet building to 12 to 16 feet. Waves occasionally around 20 feet. .SATURDAY...West gales to 40 knots diminishing to 35 knots. Snow showers likely early, then a chance of snow showers late in the morning. Waves 13 to 18 feet subsiding to 11 to 15 feet. Waves occasionally around 23 feet. .SATURDAY NIGHT...West winds to 30 knots becoming northeast and diminishing to 5 to 10 knots overnight. Waves 10 to 14 feet subsiding to 1 to 3 feet. Waves occasionally around 18 feet. .SUNDAY...East winds 10 to 15 knots becoming southeast and increasing to 15 to 25 knots. A chance of snow. Waves 2 feet or less building to 5 to 8 feet. Waves occasionally around 10 feet. .SUNDAY NIGHT...Southeast winds to 30 knots increasing to 35 knot gales. Waves 5 to 9 feet building to 7 to 10 feet. Waves occasionally around 13 feet. .MONDAY...Southeast gales to 35 knots becoming southwest to 40 knots. Rain showers during the day, then snow and rain showers Monday night. Waves 6 to 10 feet building to 13 to 17 feet. Waves occasionally around 22 feet. .TUESDAY...West gales to 40 knots diminishing to 30 knots. A chance of snow showers. Waves 12 to 17 feet subsiding to 10 to 13 feet. Waves occasionally around 22 feet. .WEDNESDAY...West winds 15 to 20 knots becoming south. A chance of snow showers Wednesday night. Waves 5 to 8 feet subsiding to 3 to 5 feet. Waves occasionally around 10 feet. $$ LOZ061-140300- MAFOR 1321/ ONTARIO WEST 1/2...GALE WARNING IN EFFECT...11436 11547 11550 14650 11640. Waves 4 to 7 feet building to 12 to 16 feet, and occasionally around 20 feet tonight. Waves 11 to 16 feet subsiding to 9 to 13 feet, and occasionally around 20 feet Saturday. ONTARIO EAST 1/2...GALE WARNING IN EFFECT...11347 11447 11540 11557 11657 13650. Waves 5 to 8 feet building to 11 to 15 feet, and occasionally around 19 feet tonight. Waves 13 to 18 feet subsiding to 11 to 15 feet, and occasionally around 23 feet Saturday. $$