FZUS61 KBUF 192002 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 PM EDT Tue Aug 19 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 29.9 inch low will move into the lower Great Lakes through tonight. A lingering surface trough will remain near the lake Wednesday, while Hurricane Erin curves north/northeastward, with center of the storm remaining well off the Carolina coastline. A 30.1 inch high will then build across the Great Lakes region Thursday through Friday night. A 29.4 inch low will move near James Bay Saturday. LOZ062-200300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 PM EDT Tue Aug 19 2025 .TONIGHT...East winds 15 to 20 knots diminishing to 10 to 15 knots. Showers with a chance of thunderstorms through the early overnight, then showers likely late. Waves 3 to 5 feet subsiding to 2 to 3 feet. .WEDNESDAY...East winds 10 to 15 knots becoming northeast 15 to 20 knots. A chance of showers early. Waves 2 to 4 feet. .WEDNESDAY NIGHT...Northeast winds 15 to 25 knots becoming east. Waves 3 to 6 feet building to 5 to 7 feet. Waves occasionally around 9 feet. .THURSDAY...East winds 15 to 20 knots. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around 9 feet. .THURSDAY NIGHT...East winds 15 to 20 knots becoming northeast and diminishing to 5 to 10 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .FRIDAY...Northeast winds 10 knots or less becoming south. Waves 1 foot or less. .SATURDAY...Southwest winds 5 to 10 knots. A chance of showers Saturday night. Waves 2 feet or less. .SUNDAY...Southwest winds 10 to 15 knots becoming west. A chance of showers. Waves 1 to 3 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063-200300- Lake Ontario open waters from Hamlin Beach to Sodus Bay- 402 PM EDT Tue Aug 19 2025 .TONIGHT...East winds 15 to 20 knots becoming southeast. Showers likely early, then showers with a chance of thunderstorms. Showers late. Waves 2 to 4 feet. .WEDNESDAY...Southeast winds 15 to 20 knots becoming east 10 to 15 knots. Showers early, then a chance of showers from late morning on. Waves 1 to 3 feet. .WEDNESDAY NIGHT...East winds 10 to 15 knots increasing to 15 to 25 knots. A chance of showers in the evening. Waves 2 to 4 feet building to 3 to 6 feet. .THURSDAY...East winds 15 to 20 knots becoming northeast 10 to 15 knots. Waves 3 to 6 feet. .THURSDAY NIGHT...Northeast winds 5 to 15 knots. Waves 1 to 3 feet. .FRIDAY...Northeast winds 10 knots or less becoming south. Waves 1 foot or less. .SATURDAY...South winds 5 to 15 knots becoming southwest. A chance of showers Saturday night. Waves 2 feet or less. .SUNDAY...Southwest winds 10 to 15 knots becoming west. A chance of showers. Waves 1 to 3 feet. Winds and waves higher in and near thunderstorms. $$ LOZ064-065-200300- Lake Ontario open waters from Sodus Bay to the Saint Lawrence River- 402 PM EDT Tue Aug 19 2025 .TONIGHT...Northeast winds 15 to 20 knots becoming southeast. A chance of showers early, then showers likely late this evening. Showers after midnight. Waves 2 to 4 feet subsiding to 1 to 3 feet. .WEDNESDAY...Southeast winds 15 to 20 knots becoming east 10 to 15 knots. Showers early, then a chance of showers from late morning on. Waves 2 to 4 feet subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...East winds 10 to 15 knots increasing to 15 to 20 knots. A chance of showers in the evening. Waves 1 to 2 feet building to 2 to 4 feet. .THURSDAY...East winds 15 to 20 knots becoming northeast 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .THURSDAY NIGHT...Northeast winds 5 to 15 knots becoming east. Waves 1 to 3 feet subsiding to 1 foot or less. .FRIDAY...Northeast winds 10 knots or less becoming south. Waves 1 foot or less. .SATURDAY...South winds 5 to 15 knots. Showers likely Saturday night. Waves 1 to 3 feet. .SUNDAY...South winds 10 to 15 knots becoming southwest. Showers likely during the day, then a chance of showers Sunday night. Waves 1 to 3 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-200300- MAFOR 1921/ ONTARIO WEST 1/2 12226 12216 14210. Waves 1 to 3 feet building to 3 to 5 feet, then subsiding to 2 to 3 feet tonight. Waves 2 to 3 feet Wednesday. ONTARIO EAST 1/2 11120 11220 12316 11326 11320 11310 11210. Waves 1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to 3 feet tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet Wednesday. $$