


Great Lakes Forecast
Issued by NWS
Issued by NWS
278 FZUS61 KBUF 091402 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1002 AM EDT Wed Jul 9 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 30.1 inch high will build across the Lower Great Lakes today. A broad 29.9 inch surface low will then track across the Mid- Atlantic States Thursday and Friday. A 29.7 inch low will lift north of the Central Great Lake Saturday, bringing a cold front to the western waters of the Lake by Saturday evening. LOZ062-092100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1002 AM EDT Wed Jul 9 2025 .THIS AFTERNOON...Southwest winds less than 10 knots becoming south. A chance of showers and thunderstorms late. Waves 1 foot or less. .TONIGHT...Southeast winds less than 10 knots becoming southwest. A chance of showers and thunderstorms in the evening. Waves 1 foot or less. .THURSDAY...Southwest winds 5 to 10 knots. Waves 1 foot or less. .THURSDAY NIGHT...South winds less than 10 knots becoming northwest. Waves 1 foot or less. .FRIDAY...Northwest winds less than 10 knots becoming south. Waves 1 foot or less. .SATURDAY...Southeast winds 5 to 10 knots becoming south. A chance of showers Saturday night. Waves 1 foot or less. .SUNDAY...Southwest winds 5 to 10 knots becoming west. A chance of showers and thunderstorms. Waves 1 to 2 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-092100- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1002 AM EDT Wed Jul 9 2025 .THIS AFTERNOON...Southwest winds less than 10 knots becoming north. Waves 1 foot or less. .TONIGHT...East winds less than 10 knots becoming south. A chance of showers late in the evening. A chance of showers and thunderstorms after midnight. Waves 1 foot or less. .THURSDAY...South winds 10 knots or less becoming west. A chance of showers and thunderstorms. Waves 1 foot or less. .THURSDAY NIGHT...Southwest winds less than 10 knots. Waves 1 foot or less. .FRIDAY...West winds 10 knots or less becoming south. Waves 1 foot or less. .SATURDAY...Southeast winds 10 knots or less becoming south 10 to 15 knots. A chance of showers Saturday night. Waves 2 feet or less. .SUNDAY...Southwest winds 5 to 15 knots becoming west. Showers likely with a chance of thunderstorms. Waves 1 to 2 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-092100- MAFOR 0915/ ONTARIO WEST 1/2 11600 11500 11300 11200 11300 11400 12500. A chance of showers this evening. Waves 1 foot or less. ONTARIO EAST 1/2 11500 11700 11100 12300 12400 11500. Waves 1 foot or less. $$