FZUS61 KBUF 100209 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1009 PM EDT Mon Mar 9 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 29.3 inch surface low southeast of James Bay this evening, will move to central Quebec Tuesday. A cold front will stall east of the Lake through Wednesday, then a frontal boundary will lift northward Wednesday as a 29.5 wave of low pressure ripples along the front, with this wave passing just to the west of the lake Wednesday night. This second low will deepen to 29.4 inches as it moves across southern Quebec Thursday. A 30.2 inch high will move across the Ohio Valley and Mid-Atlantic region Thursday night through Friday. A 29.6 inch surface low will pass across the Lake Friday night with a cold front, then shift east of the Lake Saturday. LOZ062-063-100900- Lake Ontario open waters from the Niagara River to Sodus Bay- 1009 PM EDT Mon Mar 9 2026 .OVERNIGHT...Southwest winds 5 to 15 knots. Waves 1 to 3 feet. .TUESDAY...South winds 5 to 10 knots becoming northeast. A chance of rain showers from late morning on. Waves 1 foot or less. .TUESDAY NIGHT...Northeast winds 10 to 15 knots becoming east 15 to 20 knots. A chance of rain showers in the evening, then rain showers with a chance of thunderstorms overnight. Waves 1 to 3 feet building to 2 to 4 feet. .WEDNESDAY...East winds 15 to 20 knots becoming south. Rain showers with a chance of thunderstorms. Waves 2 to 4 feet. .WEDNESDAY NIGHT...Southwest winds 15 to 25 knots becoming west to 30 knots. Rain showers with a chance of thunderstorms in the evening, then rain showers likely overnight. Waves 2 to 4 feet building to 6 to 9 feet. Waves occasionally around 11 feet. .THURSDAY...West winds to 30 knots diminishing to 15 to 20 knots. Waves 6 to 10 feet subsiding to 4 to 7 feet. Waves occasionally around 13 feet. .FRIDAY...South winds 15 to 25 knots becoming west and increasing to 35 knot gales. Snow and rain showers. Waves 3 to 5 feet building to 12 to 16 feet. Waves occasionally around 20 feet. .SATURDAY...West winds to 30 knots becoming east and diminishing to 15 to 20 knots. A chance of snow and rain showers Saturday night. Waves 11 to 15 feet subsiding to 3 to 5 feet. Waves occasionally around 19 feet. Winds and waves higher in and near thunderstorms. $$ LOZ064-065-100900- Lake Ontario open waters from Sodus Bay to the Saint Lawrence River- 1009 PM EDT Mon Mar 9 2026 .OVERNIGHT...Southwest winds 5 to 10 knots becoming south. Waves 1 to 3 feet. .TUESDAY...South winds 5 to 10 knots becoming northeast. A chance of rain showers in the afternoon. Waves 2 feet or less. .TUESDAY NIGHT...Northeast winds 5 to 15 knots. A chance of rain showers in the evening, then rain showers likely overnight. Waves 1 to 3 feet. .WEDNESDAY...Northeast winds 10 to 15 knots becoming south 15 to 20 knots. Rain showers in the morning, then rain showers with a chance of thunderstorms in the afternoon. Waves 1 to 3 feet. .WEDNESDAY NIGHT...South winds 15 to 25 knots becoming west to 30 knots. Rain showers with a chance of thunderstorms in the evening, then rain showers with a chance of snow showers overnight. Waves 2 to 4 feet building to 6 to 9 feet. Waves occasionally around 11 feet. .THURSDAY...West winds to 30 knots becoming northwest and diminishing to 15 to 20 knots. A chance of snow showers during the day. Waves 7 to 11 feet subsiding to 4 to 7 feet. Waves occasionally around 14 feet. .FRIDAY...South winds 15 to 20 knots becoming west and increasing to 35 knot gales. Snow and rain showers likely. Waves 3 to 5 feet building to 12 to 16 feet. Waves occasionally around 20 feet. .SATURDAY...West gales to 35 knots becoming east and diminishing to 15 to 20 knots. A chance of snow showers. Waves 11 to 15 feet subsiding to 2 to 4 feet. Waves occasionally around 19 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-100900- MAFOR 1003/ ONTARIO WEST 1/2 11510 12500 11200 14100. A chance of rain showers Tuesday and Tuesday evening. Waves 1 to 3 feet overnight. Waves 2 feet or less Tuesday and Tuesday evening. ONTARIO EAST 1/2 12500 11400 11300 13100 11110. A chance of rain showers Tuesday afternoon and Tuesday evening. Waves 1 to 3 feet overnight. Waves 2 feet or less Tuesday and Tuesday evening. $$