Expires:202506250800;;310179 FZUS63 KMQT 242001 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 401 PM EDT Tue Jun 24 2025 For waters beyond 5 nautical miles of shore on Lake Superior. 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... 30.2 inch ridge remains centered right over Lake Superior through Wednesday, then slides to near southern James Bay Wednesday night. On Thursday, a deepening 29.8 inch low lifts into the Upper Mississippi Valley, passing near the Straits of Mackinaw Friday. Weak ridging to 30.0 inch ridging then resides over the lake until the weekend, when a 29.6 inch low passing through northern Ontario passes a 29.8 inch trough over the lake. LSZ265-250800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 401 PM EDT Tue Jun 24 2025 .LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots veering south after midnight, then becoming southeast less than 10 knots late. Waves calm to 2 feet. .WEDNESDAY...Southeast winds 5 to 15 knots backing east in the afternoon. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots backing east after midnight. A chance of showers. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. A chance of showers through early afternoon, then showers likely by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 10 to 20 knots. Showers likely through midnight, then a chance of showers after midnight. Waves building to 1 to 3 feet. .FRIDAY...North winds 10 to 20 knots backing northwest by mid afternoon. Waves subsiding to calm to 2 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots becoming southwest 10 to 20 knots. A chance of showers. Waves calm to 2 feet. .SUNDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$