FZUS61 KBUF 150804 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 404 AM EDT Sun Mar 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 29.5 inch surface low over the mid-Mississippi Valley will track northeastward and deepen to 28.9 inches just to the west of the lake Monday morning, before pushing northeastward across Quebec through Tuesday. This low will sweep a strong cold front across the lake Monday afternoon, with a 30.4 inch high 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. A 30.2 inch high will move into the Great Lakes region Thursday. LOZ062-151500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 404 AM EDT Sun Mar 15 2026 ...GALE WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING... .TODAY...East winds 15 to 20 knots increasing to 30 knots. Snow this morning. Waves 2 to 4 feet building to 6 to 9 feet. Waves occasionally around 11 feet. .TONIGHT...Southeast winds to 30 knots. A chance of showers late. Waves 5 to 8 feet. Waves occasionally around 10 feet. .MONDAY...Southeast winds to 30 knots becoming southwest and increasing to 35 knot gales in the afternoon. Rain showers. Waves 4 to 7 feet building to 9 to 12 feet. Waves occasionally around 15 feet. .MONDAY NIGHT...Southwest gales to 35 knots becoming west. Rain showers with a chance of snow showers in the evening, then a chance of snow showers overnight. Waves 10 to 15 feet. Waves occasionally around 19 feet. .TUESDAY...West gales to 35 knots diminishing to 15 to 20 knots. A chance of snow showers. Waves 10 to 15 feet subsiding to 4 to 7 feet. Waves occasionally around 19 feet. .WEDNESDAY...Southwest winds 10 to 15 knots becoming south 15 to 20 knots. A chance of snow showers Wednesday night. Waves 1 to 3 feet. .THURSDAY...South winds 10 to 15 knots becoming west. A chance of rain and snow showers during the day, then a chance of rain showers Thursday night. Waves 1 to 3 feet. $$ LOZ063>065-151500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 404 AM EDT Sun Mar 15 2026 ...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY EVENING... .TODAY...Southeast winds 15 to 25 knots. A chance of snow early, then snow likely late this morning. Waves 1 to 3 feet building to 5 to 8 feet. Waves occasionally around 10 feet. .TONIGHT...Southeast winds to 30 knots increasing to 35 knot gales. A chance of rain showers late. Waves 5 to 8 feet building to 7 to 11 feet. Waves occasionally around 14 feet. .MONDAY...Southeast gales to 35 knots becoming southwest and diminishing to 30 knots in the afternoon. Rain showers likely in the morning, then rain showers, snow showers with a chance of thunderstorms in the afternoon. Waves 6 to 10 feet. Waves occasionally around 13 feet. .MONDAY NIGHT...West winds to 30 knots increasing to 40 knot gales. Snow showers, rain showers with a chance of thunderstorms in the evening, then lake effect snow showers overnight. Waves 9 to 13 feet building to 13 to 17 feet. Waves occasionally around 22 feet. .TUESDAY...West gales to 40 knots diminishing to 15 to 25 knots. Lake effect snow showers. Waves 13 to 18 feet subsiding to 6 to 9 feet. Waves occasionally around 23 feet. .WEDNESDAY...West winds 10 to 15 knots becoming south 15 to 20 knots. Waves 3 to 5 feet. .THURSDAY...South winds 15 to 20 knots becoming southwest. A chance of rain showers. Waves 3 to 5 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-151500- MAFOR 1509/ ONTARIO WEST 1/2 11220 11237 11230 11240 14330. Waves 1 to 2 feet building to 6 to 9 feet, and occasionally around 11 feet today. Waves 5 to 8 feet, and occasionally around 10 feet tonight. ONTARIO EAST 1/2 11210 11320 12330 11340 13350. A chance of snow this morning. Waves 1 to 3 feet building to 4 to 7 feet, and occasionally around 9 feet today. Waves 5 to 8 feet building to 7 to 11 feet, and occasionally around 14 feet tonight. $$