


Great Lakes Forecast
Issued by NWS
Issued by NWS
441 FZUS61 KBUF 060802 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 AM EDT Mon Oct 6 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 large 30.3 inch high anchored near the Mid-Atlantic coast will slowly drift offshore through tonight. A sharp cold front will then push southeast across the lower Great Lakes between Tuesday afternoon and early Tuesday evening. This will be followed by a strong 30.4 inch high that will build from the upper Great Lakes Wednesday to New York State Thursday...then will slide off the New England coast Friday. LOZ062-061500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 AM EDT Mon Oct 6 2025 .TODAY...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .TONIGHT...Southwest winds 10 to 15 knots. A chance of showers late. Waves 1 to 3 feet. .TUESDAY...Southwest winds 15 to 20 knots becoming west. Showers. Waves 1 to 3 feet building to 2 to 4 feet. .TUESDAY NIGHT...Northwest winds 15 to 20 knots. Showers in the evening, then showers likely overnight. Waves 3 to 5 feet. .WEDNESDAY...North winds 15 to 20 knots becoming northeast. Waves 3 to 5 feet subsiding to 2 to 4 feet. .THURSDAY...Northeast winds 5 to 15 knots becoming southeast. Waves 1 to 3 feet subsiding to 1 foot or less. .FRIDAY...South winds 10 knots or less becoming southwest. Waves 1 foot or less. $$ LOZ063>065-061500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 AM EDT Mon Oct 6 2025 .TODAY...South winds 5 to 15 knots. Waves 2 feet or less. .TONIGHT...South winds 5 to 15 knots. A chance of showers late. Waves 1 to 3 feet. .TUESDAY...South winds 15 to 20 knots becoming southwest. Showers in the morning, then showers with a chance of thunderstorms in the afternoon. Waves 1 to 3 feet building to 2 to 4 feet. .TUESDAY NIGHT...West winds 15 to 20 knots becoming northwest. Showers with a chance of thunderstorms in the evening, then showers overnight. Waves 2 to 4 feet building to 3 to 6 feet. .WEDNESDAY...North winds 15 to 25 knots. A chance of showers during the day. Waves 3 to 6 feet. .THURSDAY...Northeast winds 15 to 20 knots becoming south and diminishing to 5 to 10 knots. Waves 2 to 4 feet subsiding to 2 feet or less. .FRIDAY...South winds 5 to 15 knots becoming southwest. Waves 2 feet or less. Winds and waves higher in and near thunderstorms. $$ LOZ061-061500- MAFOR 0609/ ONTARIO WEST 1/2 12500 14510 11500 11510. Waves 1 to 3 feet. ONTARIO EAST 1/2 12410 11510 11500 12400 12410. Waves 2 feet or less. $$