FZUS61 KBUF 072002 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 PM EDT Tue Jul 7 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 29.9 inch low continues to move off the southern New England coast, while a broad 30.1 inch high builds across the lower Great Lakes tonight through Wednesday. A weak cold front will cross the Lake Thursday night through early Friday with another 30.1 inch high building across the upper Great Lakes Friday and the lower Great Lakes by Saturday night. LOZ062-080300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 PM EDT Tue Jul 7 2026 .TONIGHT...East winds 10 knots or less. Waves 2 feet or less. .WEDNESDAY...Southeast winds less than 10 knots. Waves 1 foot or less. .WEDNESDAY NIGHT...Southeast winds 10 knots or less becoming southwest. Waves 1 foot or less. .THURSDAY...Southwest winds 5 to 10 knots. A chance of showers and thunderstorms in the afternoon. Waves 2 feet or less. .THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west. Showers likely with a chance of thunderstorms in the evening, then showers likely overnight. Waves 1 to 2 feet. .FRIDAY...Northwest winds 10 knots or less becoming northeast. A chance of showers during the day. Waves 1 foot or less. .SATURDAY...Northeast winds 10 knots or less becoming east. Waves 1 foot or less. .SUNDAY...East winds 10 knots or less becoming southwest. Waves 1 foot or less. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-080300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 PM EDT Tue Jul 7 2026 .TONIGHT...East winds 5 to 10 knots becoming southeast. Waves 1 foot or less. .WEDNESDAY...South winds 10 knots or less becoming north. Waves 1 foot or less. .WEDNESDAY NIGHT...Southwest winds 10 knots or less. Waves 1 foot or less. .THURSDAY...Southwest winds 5 to 10 knots. Waves 1 foot or less. .THURSDAY NIGHT...Southwest winds 5 to 10 knots becoming west. Showers likely. Waves 2 feet or less. .FRIDAY...Northwest winds 5 to 10 knots becoming northeast. Showers likely during the day. Waves 2 feet or less. .SATURDAY...Northeast winds 10 knots or less becoming east. Waves 1 foot or less. .SUNDAY...Southeast winds 10 knots or less becoming southwest. Waves 1 foot or less. Winds and waves higher in and near thunderstorms. $$ LOZ061-080300- MAFOR 0721/ ONTARIO WEST 1/2 14200 12300 12100. Waves 2 feet or less. ONTARIO EAST 1/2 11200 14300 12400 11800. Waves 1 foot or less. $$