Expires:202106182215;;459322 FZUS63 KMQT 181414 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1014 AM EDT Fri Jun 18 2021 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 trough across Lake Superior will deepen to 29.6 inches over northern Lake Superior today and expand across the eastern half of the Lake Friday evening. The troughing will weaken over Lake Superior Saturday morning as a weak 29.8 inch ridge shifts over the region. A 29.5 inch area of low pressure will approach from the west Sunday and move over Lake Superior Sunday night. Weak 29.8 inch ridging returns over western portions of Lake Superior Monday evening and builds to 29.9 inches as it shifts across the Lake on Tuesday. LSZ266-182215- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- 1014 AM EDT Fri Jun 18 2021 .REST OF TODAY...West winds 15 to 25 knots. Waves 2 to 4 feet. .TONIGHT...Northwest winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet. .SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots late. Waves subsiding to calm to 2 feet. .SATURDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .SUNDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Showers likely by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 10 to 20 knots becoming northwest 15 to 25 knots after midnight. Showers. Waves building to 1 to 3 feet. .MONDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet. .TUESDAY...West winds 10 to 20 knots backing southwest. Waves subsiding to calm to 2 feet. $$