FZUS63 KMQT 081401 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1001 AM EDT Wed Jul 8 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 Hudson Bay low moves into northern Quebec throughout today, sending a trough as low as 29.9 inches over the Upper Great Lakes. Weak high pressure to 30.0 inches then builds over Lake Superior and northern Ontario Thursday and Friday. Saturday, the high builds to 30.1 inches as it shifts towards southern Ontario. The high continues to shift south Sunday, reaching the Lower Great Lakes at 30.2 inches before weakening to 30.1 inches again Monday south of the Great Lakes. Another strong low of 29.3 inches looks to cross into Hudson Bay early next week. LSZ162-082000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1001 AM EDT Wed Jul 8 2026 /901 AM CDT Wed Jul 8 2026/ .REST OF TODAY...Northeast winds 5 to 15 knots veering south late. A slight chance of thunderstorms by late morning. A chance of showers. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...North winds less than 10 knots. Waves calm to 2 feet. .THURSDAY NIGHT...North winds less than 10 knots. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots increasing to 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 5 to 15 knots becoming north less than 10 knots after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ263-082000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...Northeast winds 5 to 15 knots diminishing to less than 10 knots in the afternoon, then becoming southwest 5 to 15 knots late. A slight chance of thunderstorms by late morning. A chance of showers. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots diminishing to less than 10 knots after midnight. Waves calm to 2 feet. .THURSDAY...West winds less than 10 knots veering north in the afternoon, then becoming southwest 5 to 15 knots late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds less than 10 knots veering west after midnight. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots becoming west less than 10 knots after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. $$ LSZ264-082000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...Southwest winds less than 10 knots becoming south 5 to 15 knots late. A slight chance of showers by late morning. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots veering west after midnight, then diminishing to less than 10 knots late. Waves calm to 2 feet. .THURSDAY...West winds less than 10 knots. Waves calm to 2 feet. .THURSDAY NIGHT...West winds less than 10 knots veering northwest after midnight. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots veering southeast by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots backing south. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to 3 feet. $$ LSZ265-082000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...Northeast winds 5 to 15 knots veering east in the afternoon. A chance of showers. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots backing northeast after midnight. A slight chance of showers. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots veering east late. Waves calm to 2 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet. $$ LSZ266-082000- 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- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .TONIGHT...Northeast winds 5 to 15 knots backing northwest late. A slight chance of thunderstorms through midnight. A slight chance of showers. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 1 to 3 feet. $$ LSZ267-082000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...East winds 5 to 15 knots backing northeast late. A slight chance of thunderstorms by late morning. A chance of showers. Waves calm to 2 feet. .TONIGHT...North winds 5 to 15 knots backing northwest late. A slight chance of showers. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...West winds 5 to 15 knots veering northwest after midnight. Waves calm to 2 feet. .FRIDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...North winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...Northeast winds 5 to 15 knots veering south. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm to 2 feet. $$ LSZ261-082000- MAFOR 0815/ Superior West 11100 11300 11500 12600 13500. A chance of showers late this morning. Waves 1 foot or less. Superior North Central 11600 13500 12600 12700. Waves 1 foot or less. Superior South Central 11100 12200 11300 12100 11800 11700. A chance of showers this afternoon. Waves 1 foot or less. Superior East 12200 11100 13800 12700. A chance of showers this afternoon. Waves 1 foot or less. $$ 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