


Great Lakes Forecast
Issued by NWS
Issued by NWS
888 FZUS61 KBUF 250803 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 AM EDT Fri Jul 25 2025 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 weak cold front will cross the lower Great Lakes from northwest to southeast today, before stalling just south of New York State tonight. A 30.1 inch high will then build from the upper Great Lakes Friday night to New England Saturday night, then to just south of the Canadian Maritimes Sunday. Meanwhile, a weak 29.8 inch surface low will pass near the lake Sunday morning. A general area of weak high pressure averaging 30.0 inches will then build into the Ohio Valley and southern Great Lakes Monday. LOZ062-251500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 AM EDT Fri Jul 25 2025 .TODAY...West winds 5 to 10 knots. Numerous showers early. Waves 2 feet or less. .TONIGHT...West winds 5 to 10 knots becoming northeast. Waves 1 foot or less. .SATURDAY...East winds 5 to 10 knots. Waves 1 foot or less. .SATURDAY NIGHT...East winds 5 to 10 knots becoming southwest. A chance of showers overnight. Waves 1 foot or less. .SUNDAY...West winds 5 to 10 knots. A chance of showers during the day. Waves 1 foot or less. .MONDAY...Southwest winds 5 to 15 knots becoming west. A chance of showers Monday night. Waves 2 feet or less. .TUESDAY...West winds 5 to 15 knots becoming northwest. A chance of showers during the day. Waves 1 to 2 feet. $$ LOZ063>065-251500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 AM EDT Fri Jul 25 2025 .TODAY...West winds 5 to 10 knots. Scattered showers and thunderstorms early. Waves 1 to 3 feet. .TONIGHT...West winds 10 knots or less becoming southeast. Waves 2 feet or less. .SATURDAY...Southeast winds 10 knots or less becoming east. Waves 1 foot or less. .SATURDAY NIGHT...East winds 5 to 10 knots becoming south. A chance of showers and thunderstorms overnight. Waves 1 foot or less. .SUNDAY...Southwest winds 10 knots or less. A chance of showers during the day. Waves 1 foot or less. .MONDAY...Southwest winds 5 to 10 knots becoming west. A chance of showers and thunderstorms Monday night. Waves 2 feet or less. .TUESDAY...West winds around 10 knots becoming northwest. A chance of showers during the day. Waves 1 to 2 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-251500- MAFOR 2509/ ONTARIO WEST 1/2 11600 19606 14600 11600 11800 11100. Waves 2 feet or less. ONTARIO EAST 1/2 11600 19606 14600 11600 11100 11200. Waves 1 to 3 feet today. Waves 2 feet or less tonight. $$