FZUS61 KBUF 142111 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 511 PM EDT Sun Jun 14 2026 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 cold front will drop south of the lower Great Lakes this evening. Following the front, a 29.9 inch high will build across the region through Monday, then exit off to our northeast Tuesday while weakening to 29.8 inches. A 29.4 inch low will then track north of the lake on Wednesday, with its trailing cold front approaching the lake late in the day on Wednesday. A second 29.4 inch surface low will pass across the upper Great Lakes Thursday, with a warm front, followed by a cold front to sweep across the lake throughout the day. LOZ062-150315- Lake Ontario open waters from the Niagara River to Hamlin Beach- 511 PM EDT Sun Jun 14 2026 .TONIGHT...South winds 15 to 25 knots becoming northwest. Showers likely early, then a chance of showers late this evening. Waves 1 to 3 feet building to 3 to 5 feet. .MONDAY...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .MONDAY NIGHT...Southwest winds 5 to 10 knots. Waves 1 to 2 feet. .TUESDAY...Southwest winds 10 to 15 knots. Waves 2 feet or less. .TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming south. A chance of showers overnight. Waves 2 feet or less. .WEDNESDAY...South winds 10 to 15 knots becoming southeast 15 to 20 knots. A chance of showers during the day, then showers with a chance of thunderstorms Wednesday night. Waves 1 to 3 feet. .THURSDAY...South winds to 30 knots becoming west. Showers with a chance of thunderstorms during the day, then a chance of showers Thursday night. Waves 4 to 7 feet building to 7 to 10 feet, then subsiding to 5 to 8 feet. Waves occasionally around 13 feet. .FRIDAY...West winds 15 to 20 knots. Waves 4 to 7 feet subsiding to 2 to 4 feet. Waves occasionally around 9 feet. Winds and waves higher in and near thunderstorms. $$ LOZ064-065-150315- Lake Ontario open waters from Sodus Bay to the Saint Lawrence River- 511 PM EDT Sun Jun 14 2026 ...SEVERE THUNDERSTORM WATCH 334 IN EFFECT UNTIL 10 PM EDT THIS EVENING... .TONIGHT...East winds 10 to 15 knots becoming northwest and increasing to 15 to 25 knots. Showers with a chance of thunderstorms early, then showers likely late this evening. Some thunderstorms may be severe with strong winds and large hail. Waves 1 to 3 feet building to 3 to 5 feet. .MONDAY...West winds 15 to 20 knots. Waves 3 to 5 feet. .MONDAY NIGHT...West winds 15 to 20 knots becoming southwest 5 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 2 feet. .TUESDAY...South winds 5 to 10 knots. Waves 2 feet or less. .TUESDAY NIGHT...South winds 5 to 15 knots. Waves 2 feet or less. .WEDNESDAY...South winds 5 to 15 knots becoming southeast 15 to 20 knots. Showers likely with a chance of thunderstorms. Waves 1 to 3 feet. .THURSDAY...Southeast winds to 30 knots becoming west. Showers with a chance of thunderstorms during the day, then a chance of showers Thursday night. Waves 4 to 7 feet building to 7 to 11 feet. Waves occasionally around 14 feet. .FRIDAY...West winds 15 to 25 knots. Waves 6 to 9 feet subsiding to 3 to 6 feet. Waves occasionally around 11 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063-150315- Lake Ontario open waters from Hamlin Beach to Sodus Bay- 511 PM EDT Sun Jun 14 2026 .TONIGHT...Southeast winds 15 to 20 knots becoming northwest. Showers with a chance of thunderstorms early, then a chance of showers late this evening. Waves 1 to 3 feet building to 2 to 4 feet. .MONDAY...West winds 15 to 20 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet. .MONDAY NIGHT...West winds 5 to 15 knots becoming southwest. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TUESDAY...Southwest winds 10 knots or less becoming south. Waves 1 foot or less. .TUESDAY NIGHT...South winds 10 knots or less. Waves 1 foot or less. .WEDNESDAY...South winds 5 to 10 knots increasing to 15 to 20 knots. Showers likely. Waves 1 to 3 feet. .THURSDAY...Southeast winds to 30 knots becoming west. Showers with a chance of thunderstorms during the day, then a chance of showers Thursday night. Waves 4 to 7 feet building to 6 to 10 feet. Waves occasionally around 13 feet. .FRIDAY...West winds 15 to 25 knots. Waves 6 to 9 feet subsiding to 3 to 6 feet. Waves occasionally around 11 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-150315- MAFOR 1421/ ONTARIO WEST 1/2 11410 11630 12720 11620 12610 11510. A chance of showers this evening. Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet Monday. ONTARIO EAST 1/2...SEVERE THUNDERSTORM WATCH IN EFFECT...11126 11410 11620 11730 14620. A chance of thunderstorms this evening. Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet Monday. $$