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LSZ162 Fzus63 Kmqt 200748 Glfls Open Lake Forecast For Lake Superior National Weather Service Marquette Mi 348 Am Edt Sun Sep 20 2020 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..High pressure of 30.5 inches centered over quebec will linger through Sunday. Meanwhile, a 29.7 inch trough will lift northeastward through the northern plains Sunday night. That trough will close off into a 29.4 inch low over northern manitoba Monday morning with lake superior remaining sandwiched between this low to the northwest and strong high pressure to the east. The pressure gradient will weaken Tuesday morning when 30.0 inch ridging builds across lake superior. This ridge will be replaced by a 29.7 inch trough by late Wednesday, continuing into Thursday morning. Lsz162-201600- lake superior west of a line from saxon harbor wi to grand portage mn beyond 5nm- 348 am edt Sun sep 20 2020 /248 am cdt Sun sep 20 2020/ Early this morning..South winds 5 to 15 knots. Waves calm to 2 feet. Today..South winds 10 to 20 knots. Waves calm to 2 feet. Tonight..South winds 10 to 20 knots increasing to 15 to 25 knots after midnight. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet. Monday..Southwest winds 15 to 25 knots diminishing to 10 to 20 knots in the afternoon. Waves subsiding to 1 to 3 feet. Monday night..Southwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. Tuesday..Southwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. Tuesday night..Southeast winds less than 10 knots veering south after midnight. Waves calm to 2 feet. Wednesday..South winds 5 to 15 knots becoming north 10 to 20 knots. A chance of showers. Waves calm to 2 feet. Thursday..Northeast winds 10 to 20 knots becoming east 5 to 15 knots. Waves calm to 2 feet.