


Great Lakes Forecast
Issued by NWS
Issued by NWS
994 FZUS61 KBUF 160203 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1003 PM EDT Tue Jul 15 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 slowly drift from the Great Lakes to New England through Wednesday. A 29.7 inch low will track northeastward across the Great Lakes and into Quebec Wednesday night and Thursday, with its trailing cold front pushing across the lake early Friday. A 30.2 inch high will then build into the region later Friday through Saturday. LOZ062-160900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1003 PM EDT Tue Jul 15 2025 .OVERNIGHT...Southeast winds 5 to 10 knots becoming southwest. Waves 1 foot or less. .WEDNESDAY...Southwest winds 10 knots or less becoming southeast. Waves 1 foot or less. .WEDNESDAY NIGHT...South winds 5 to 10 knots becoming southwest. A chance of showers overnight. Waves 1 foot or less. .THURSDAY...Southwest winds 10 to 15 knots becoming west. A chance of showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. Waves 1 to 3 feet. .THURSDAY NIGHT...West winds 15 to 20 knots becoming north 10 to 15 knots. Showers likely with a chance of thunderstorms in the evening. Waves 2 to 4 feet. .FRIDAY...Northeast winds 5 to 15 knots becoming east. Waves 1 to 3 feet subsiding to 1 foot or less. .SATURDAY...Southeast winds 5 to 10 knots becoming southwest. A chance of showers Saturday night. Waves 1 foot or less. .SUNDAY...North winds around 10 knots. A chance of showers during the day. Waves 1 to 2 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-160900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1003 PM EDT Tue Jul 15 2025 .OVERNIGHT...South winds 5 to 10 knots. Waves 1 foot or less. .WEDNESDAY...South winds 5 to 10 knots becoming southeast. A chance of showers and thunderstorms late. Waves 1 foot or less. .WEDNESDAY NIGHT...South winds 5 to 10 knots. A chance of showers and thunderstorms. Waves 1 foot or less. .THURSDAY...South winds 10 to 15 knots becoming west. A chance of showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. Waves 1 to 3 feet. .THURSDAY NIGHT...West winds 10 to 15 knots becoming north 15 to 20 knots. Showers likely with a chance of thunderstorms in the evening, then a chance of showers overnight. Waves 2 to 4 feet. .FRIDAY...North winds 5 to 15 knots becoming southwest. Waves 2 to 4 feet subsiding to 2 feet or less. .SATURDAY...South winds 5 to 10 knots. A chance of showers Saturday night. Waves 1 foot or less. .SUNDAY...South winds around 10 knots becoming north. A chance of showers during the day. Waves 2 feet or less. Winds and waves higher in and near thunderstorms. $$ LOZ061-160900- MAFOR 1603/ ONTARIO WEST 1/2 12400 12500 11800 12300 11400. Waves 1 foot or less. ONTARIO EAST 1/2 14400 11400 11300 12400. A chance of showers and thunderstorms Wednesday evening. Waves 1 foot or less. $$