FZUS63 KMQT 072001 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 401 PM EDT Tue Jul 7 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... Pressure at 30.0 inches prevails over Lake Superior this evening as a 30.1 inch high over the Northern Plains extends over the Upper Great Lakes through tonight. A Hudson low moves into northern Quebec throughout Wednesday, 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 into Monday as low pressure of at least 29.7 inches moves across northern Ontario. LSZ162-080800- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 401 PM EDT Tue Jul 7 2026 /301 PM CDT Tue Jul 7 2026/ .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots veering west after midnight. A chance of showers. A slight chance of thunderstorms after midnight. Waves calm to 2 feet. .WEDNESDAY...North winds 5 to 15 knots veering south late. A chance of showers and a slight chance of thunderstorms through early afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...North winds less than 10 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 becoming northeast 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds less than 10 knots backing north 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. $$ LSZ263-080800- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 401 PM EDT Tue Jul 7 2026 .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots becoming west less than 10 knots late. A chance of showers after midnight. Waves calm to 2 feet. .WEDNESDAY...West winds less than 10 knots becoming northeast 5 to 15 knots in the afternoon, then veering southwest late. A slight chance of thunderstorms through early afternoon. A chance of showers. Waves calm to 2 feet. .WEDNESDAY NIGHT...West winds 5 to 15 knots diminishing to less than 10 knots after midnight, then backing southwest late. Waves calm to 2 feet. .THURSDAY...North winds less than 10 knots becoming northeast 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds less than 10 knots veering southeast after midnight. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots. Waves calm to 2 feet. .FRIDAY NIGHT...East winds less than 10 knots veering southwest after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 15 to 25 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. $$ LSZ264-080800- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 401 PM EDT Tue Jul 7 2026 .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots becoming west less than 10 knots late. A chance of showers after midnight. Waves calm to 2 feet. .WEDNESDAY...West winds less than 10 knots backing south in the afternoon, then becoming southwest 5 to 15 knots late. A chance of showers through early afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southwest winds less than 10 knots veering northwest late. Waves calm to 2 feet. .THURSDAY...North winds less than 10 knots backing west by mid afternoon. 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 becoming south 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. $$ LSZ265-080800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 401 PM EDT Tue Jul 7 2026 .LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots veering southwest late. A slight chance of showers after midnight. Waves calm to 2 feet. .WEDNESDAY...Southwest winds 5 to 15 knots backing east in the afternoon. Showers likely through early afternoon, then a chance of showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots backing northeast late. A slight chance of showers. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots veering southwest. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to 3 feet. $$ LSZ266-080800- 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- 401 PM EDT Tue Jul 7 2026 .LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots backing south after midnight. A slight chance of showers. Waves calm to 2 feet. .WEDNESDAY...Southwest winds 5 to 15 knots backing northeast in the afternoon. Showers likely through early afternoon, then a chance of showers and a slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Northeast winds 5 to 15 knots backing north late. A chance of showers and a slight chance of thunderstorms through midnight. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots backing northwest by mid afternoon. 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. 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. $$ LSZ267-080800- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 401 PM EDT Tue Jul 7 2026 .LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots backing south after midnight, then backing east late. A slight chance of showers. Waves calm to 2 feet. .WEDNESDAY...North winds 5 to 15 knots. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...North winds 5 to 15 knots. A slight chance of thunderstorms through midnight. A chance of showers. Waves calm to 2 feet. .THURSDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...North winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm to 2 feet. $$ LSZ261-080200- MAFOR 0721/ Superior West 13500 11600 11706 11806 11800 11300. Waves 1 foot or less. Superior North Central 14500 11600 11606 11600 11500. Waves 1 foot or less. Superior South Central 11300 12400 11300 11500 11406 11306 11100. Waves 1 foot or less. Superior East 12600 11500 12200 11700 12800. A chance of showers Wednesday. 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