FZUS63 KMQT 200757 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 356 AM EDT Wed May 20 2026 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 30.3 inch high over the Northern Plains shifts over Lake Superior today and builds to 30.4 inches tonight. The high pressure shifts east Thursday night while leaving lingering ridging of at least 30.3 inches over Lake Superior through Friday. A 29.9 inch low then lifts into the Lower Great Lakes from the Southern Plains Friday night and Saturday, but 30.1 inch ridging persists over Lake Superior the remainder of the weekend. LSZ162-202000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 356 AM EDT Wed May 20 2026 /256 AM CDT Wed May 20 2026/ .EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...West winds 5 to 15 knots backing south in the afternoon. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots backing northeast late. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...East winds 10 to 20 knots becoming northeast 15 to 25 knots by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...Northeast winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet. .SATURDAY...Northeast winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ263-202000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 356 AM EDT Wed May 20 2026 .EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots backing southwest in the afternoon, then backing south late. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots diminishing to less than 10 knots after midnight, then becoming south 5 to 15 knots late. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .SATURDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ264-202000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 356 AM EDT Wed May 20 2026 .EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to 3 feet. .TODAY...Northwest winds 5 to 15 knots backing southwest late. Waves subsiding to calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots becoming south less than 10 knots after midnight. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing southeast in the afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves building to 1 to 3 feet. .SATURDAY...East winds 10 to 20 knots becoming southeast 5 to 15 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ265-202000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 356 AM EDT Wed May 20 2026 .EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to 3 feet. .TODAY...Northwest winds 5 to 15 knots veering north in the afternoon, then veering southeast late. Waves subsiding to calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots becoming east 10 to 20 knots in the afternoon, then increasing to 15 to 25 knots late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...East winds 15 to 25 knots. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .SATURDAY...East winds 15 to 25 knots becoming southeast 10 to 20 knots. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet. .SUNDAY...Southwest winds 10 to 20 knots backing south. Waves subsiding to calm to 2 feet. $$ LSZ266-202000- 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- 356 AM EDT Wed May 20 2026 .EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 3 to 6 feet occasionally to 8 feet. .TODAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon, then backing west late. Waves subsiding to calm to 2 feet. .TONIGHT...West winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing southeast in the afternoon, then becoming east 10 to 20 knots late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots becoming south 5 to 15 knots after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Waves building to 2 to 4 feet. .SATURDAY...East winds 15 to 25 knots becoming southeast 10 to 20 knots. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet. .SUNDAY...Southwest winds 5 to 15 knots backing south. Waves subsiding to calm to 2 feet. $$ LSZ267-202000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 356 AM EDT Wed May 20 2026 .EARLY THIS MORNING...Northwest winds 20 to 30 knots. Waves 4 to 7 feet occasionally to 9 feet subsiding to 3 to 6 feet occasionally to 8 feet. .TODAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves subsiding to 1 to 3 feet. .TONIGHT...Northwest winds 5 to 15 knots veering north after midnight, then veering south late. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing northeast in the afternoon, then veering east late. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Waves building to 2 to 4 feet. .SATURDAY...East winds 15 to 25 knots becoming southeast 10 to20 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to 2 feet. .SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ261-201400- MAFOR 2009/ Superior West 12700 11500 11410 11400 13300. Waves 1 foot or less. Superior North Central 13710 11500 12510 12400. Waves 1 to 3 feet today. Waves 1 foot or less tonight. Superior South Central 11720 12710 11800 11300 13400. Waves 2 to 4 feet subsiding to 1 to 3 feet today. Waves 1 foot or less tonight. Superior East 11730 13720 11610 11710 11700 11200. Waves 4 to 7 feet subsiding to 2 to 3 feet today. Waves 1 to 3 feet subsiding to 1 foot or less tonight. $$ WFO MQT Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes