Expires:202511122100;;277458 FZUS63 KMQT 120901 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 401 AM EST Wed Nov 12 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... A 29.5 inch trough over Lake Superior early this morning departs into eastern Ontario throughout the morning as a 29.4 inch low moves over Hudson Bay. By tonight, the lake will be between 30.1 inch ridging over the Midwest and a deep 28.4 inch low over Labrador. Ridging builds to 30.0 inches over the lake Thursday night ahead of a 29.4 inch trough moving out of the northern Rockies. This trough looks to move across Lake Superior at around 29.4 inches on Saturday. By the end of the weekend, Lake Superior will be between low pressure of near 29.0 inches over the Canadian Maritimes and high pressure of near 30.1 inches over the Great Plains. LSZ263-122100- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 401 AM EST Wed Nov 12 2025 ...GALE WARNING IN EFFECT THROUGH THIS EVENING... .EARLY THIS MORNING...Northwest gales to 35 knots. Waves 6 to 9 feet occasionally to 11 feet building to 7 to 10 feet occasionally to 13 feet. .TODAY...Northwest gales to 35 knots. Waves subsiding to 6 to 9 feet occasionally to 11 feet, then building to 7 to 10 feet occasionally to 13 feet. .TONIGHT...Northwest winds 20 to 30 knots becoming west 15 to 25 knots late. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet. .THURSDAY...West winds 20 to 30 knots. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming east 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots. Waves building to 2 to 4 feet. .FRIDAY NIGHT...South winds 10 to 20 knots. Waves 2 to 4 feet. .SATURDAY...West winds 20 to 30 knots veering northwest. A chance of rain showers. Waves building to 5 to 8 feet occasionally to 10 feet. .SUNDAY...Northwest winds 20 to 30 knots. Waves building to 6 to 9 feet occasionally to 11 feet, then subsiding to 2 to 4 feet. $$