


Great Lakes Forecast
Issued by NWS
Issued by NWS
878 FZUS61 KBUF 152002 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 PM EDT Sun Jun 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 30.2 inch high will remain off the New England coast tonight. A frontal boundary will remain stalled south of the lower Great Lakes through Monday as a weak 29.9 inch low moves from the Ohio Valley to the Mid Atlantic. Another 29.6 inch low will then push northeast across the upper Great Lakes Tuesday, followed by a 29.5 inch low forecast to track across the central Great Lakes and Quebec Wednesday through Thursday. A 30.2 inch high will move into the Great Lakes region Friday. LOZ062-160300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 PM EDT Sun Jun 15 2025 .TONIGHT...East winds 5 to 10 knots. Waves 1 to 2 feet. .MONDAY...East winds 5 to 10 knots becoming northeast. Waves around 1 foot. .MONDAY NIGHT...East winds 5 to 10 knots becoming south. Waves 1 to 2 feet. .TUESDAY...Southeast winds 10 knots or less becoming east. A chance of showers in the afternoon. Waves 1 foot or less. .TUESDAY NIGHT...Southeast winds 5 to 10 knots becoming southwest. A chance of showers. Waves 1 foot or less. .WEDNESDAY...Southwest winds 5 to 15 knots increasing to 15 to 20 knots. A chance of showers and thunderstorms during the day, then showers likely with a chance of thunderstorms Wednesday night. Waves 2 feet or less building to 2 to 4 feet. .THURSDAY...Southwest winds 15 to 20 knots becoming northwest 10 to 15 knots. Showers likely with a chance of thunderstorms during the day, then a chance of showers and thunderstorms Thursday night. Waves 2 to 4 feet. .FRIDAY...Northwest winds 10 to 15 knots becoming southwest. Waves 1 to 3 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-160300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 PM EDT Sun Jun 15 2025 .TONIGHT...East winds 10 knots or less. Waves 1 foot or less. .MONDAY...Southeast winds 5 to 10 knots becoming east. Waves 2 feet or less. .MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves 2 feet or less. .TUESDAY...Southeast winds 5 to 15 knots. A chance of showers in the afternoon. Waves 2 feet or less. .TUESDAY NIGHT...Southeast winds 10 to 15 knots becoming south. A chance of showers. Waves 1 to 3 feet. .WEDNESDAY...Southwest winds 5 to 15 knots becoming south. A chance of showers and thunderstorms during the day, then showers likely with a chance of thunderstorms Wednesday night. Waves 1 to 3 feet. .THURSDAY...Southwest winds 15 to 20 knots becoming west. Showers likely with a chance of thunderstorms. Waves 2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to 4 feet. .FRIDAY...Northwest winds 10 to 15 knots becoming southwest. Waves 2 to 4 feet subsiding to 1 to 3 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-160300- MAFOR 1521/ ONTARIO WEST 1/2 15200 12100. Waves 2 feet or less. ONTARIO EAST 1/2 11100 13200 12300 11200 11100. Waves 1 foot or less. $$