FZUS61 KBUF 200204 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1004 PM EDT Thu Mar 19 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...Following the passage of a warm front, a 30.2 inch high will build across the Great Lakes through this evening. A 29.8 inch low will track from the upper Great Lakes to the lower Great Lakes Friday, before a 30.0 inch high becomes briefly established Saturday. Another 29.6 inch wave of low pressure will cross the lower Great Lakes Sunday into Monday with a strong cold front in its wake. A 30.4 inch high is then forecast to build across the Upper Great Lakes on Monday, and the Eastern Great Lakes through Tuesday. LOZ062-200900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1004 PM EDT Thu Mar 19 2026 .OVERNIGHT...Northwest winds 10 knots or less becoming southeast. Waves 2 feet or less. .FRIDAY...Southeast winds 10 to 15 knots becoming northwest 15 to 20 knots. Snow and rain showers in the morning, then rain showers early in the afternoon. A chance of rain showers late. Waves 1 to 3 feet building to 3 to 5 feet. .FRIDAY NIGHT...North winds 15 to 20 knots becoming northwest 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 2 feet. .SATURDAY...Northwest winds 5 to 10 knots. Waves around 1 foot. .SATURDAY NIGHT...Northeast winds 5 to 10 knots becoming east. A chance of rain and snow showers overnight. Waves around 1 foot. .SUNDAY...East winds 10 to 15 knots becoming northeast and increasing to 15 to 25 knots. Rain and snow showers likely. Waves 1 to 3 feet building to 5 to 7 feet. Waves occasionally around 9 feet. .MONDAY...North winds 15 to 25 knots becoming northwest. A chance of rain and snow showers during the day. Waves 3 to 6 feet subsiding to 1 to 3 feet. .TUESDAY...West winds 10 to 15 knots increasing to 15 to 20 knots. Waves 1 to 3 feet building to 3 to 5 feet. $$ LOZ063-064-200900- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 1004 PM EDT Thu Mar 19 2026 .OVERNIGHT...Northwest winds 10 knots or less becoming south. Waves 1 to 2 feet. .FRIDAY...Southeast winds 10 to 15 knots becoming northwest 15 to 20 knots. A chance of snow showers early, then rain and snow showers late in the morning. Rain showers in the afternoon. Waves 1 to 3 feet building to 2 to 4 feet. .FRIDAY NIGHT...North winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .SATURDAY...Northwest winds around 10 knots. Waves 1 to 2 feet. .SATURDAY NIGHT...Northeast winds 5 to 10 knots becoming east. A chance of rain and snow showers overnight. Waves 1 foot or less. .SUNDAY...East winds 10 to 15 knots becoming north and increasing to 15 to 25 knots. Rain and snow showers likely. Waves 2 feet or less building to 4 to 7 feet. Waves occasionally around 9 feet. .MONDAY...North winds 15 to 25 knots becoming northwest. A chance of rain and snow showers during the day. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around 9 feet. .TUESDAY...Northwest winds 15 to 25 knots becoming west. A chance of snow showers Tuesday night. Waves 2 to 4 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ065-200900- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 1004 PM EDT Thu Mar 19 2026 .OVERNIGHT...West winds 10 knots or less becoming north. Waves 2 feet or less. .FRIDAY...Southeast winds 5 to 10 knots becoming north and increasing to 15 to 20 knots. A chance of snow showers early, then snow and rain showers. Rain showers late. Waves 1 foot or less building to 2 to 4 feet. .FRIDAY NIGHT...North winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 1 to 3 feet subsiding to 1 foot or less. .SATURDAY...Northwest winds 5 to 10 knots becoming west. Waves 1 foot or less. .SATURDAY NIGHT...Northeast winds 5 to 10 knots becoming east. A chance of rain and snow showers overnight. Waves 1 foot or less. .SUNDAY...East winds 10 to 15 knots becoming north and increasing to 15 to 25 knots. Rain and snow showers likely. Waves 2 feet or less building to 3 to 5 feet. .MONDAY...North winds 15 to 25 knots. A chance of snow and rain showers during the day. Waves 3 to 5 feet subsiding to 1 to 3 feet. .TUESDAY...Northwest winds 10 to 15 knots becoming southwest 15 to 20 knots. A chance of snow showers Tuesday night. Waves 2 feet or less building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ061-200900- MAFOR 2003/ ONTARIO WEST 1/2 11700 12300 11317 11326 11720 11820 11810. Waves 2 feet or less overnight. Waves 1 to 3 feet building to 3 to 5 feet Friday. Waves 2 to 4 feet Friday evening. ONTARIO EAST 1/2 12700 11300 11317 11327 11526 11820 11810. Waves 2 feet or less overnight. Waves 1 foot or less building to 2 to 4 feet Friday. Waves 2 to 4 feet Friday evening. $$