FZUS63 KMQT 090801 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 401 AM EDT Thu Jul 9 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 29.9 inch trough is analyzed over the lake this morning, extending from low pressure currently moving into Quebec. Weak high pressure then builds to 30.0 inches over Lake Superior and northern Ontario today and Friday. Saturday, the high builds to 30.1 inches as it shifts toward 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. LSZ162-092000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 401 AM EDT Thu Jul 9 2026 /301 AM CDT Thu Jul 9 2026/ ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT /7 AM CDT/ THIS MORNING... .EARLY THIS MORNING...North winds less than 10 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...East winds less than 10 knots becoming north 5 to 15 knots in the afternoon, then diminishing to less than 10 knots late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...North winds less than 10 knots. Waves calm to 2 feet. .FRIDAY...North winds less than 10 knots becoming east 5 to 15 knots in the afternoon, then backing northeast late. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 5 to 15 knots diminishing to less than 10 knots after midnight. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .SATURDAY...East winds less than 10 knots becoming north 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Northeast winds less than 10 knots backing north after midnight. 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. .MONDAY...Southwest winds 15 to 25 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. $$ LSZ263-092000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 401 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...West winds less than 10 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...East winds less than 10 knots backing north in the afternoon, then becoming northeast 5 to 15 knots late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...West winds less than 10 knots backing southwest after midnight. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots backing northeast in the afternoon, then becoming east 5 to 15 knots late. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots backing northeast after midnight. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .SATURDAY...South winds less than 10 knots backing east by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...East winds less than 10 knots becoming southwest 5 to 15 knots after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 2 to 4 feet. .MONDAY...Southwest winds 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ264-092000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 401 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECTUNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...West winds less than 10 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...Northwest winds less than 10 knots backing west late. Patchy dense fog. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots veering northwest after midnight, then diminishing to less than 10 knots late. Waves calm to 2 feet. .FRIDAY...Southeast winds less than 10 knots increasing to 5 to 15 knots late. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots. A slight chance of showers after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots diminishing to less than 10 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds less than 10 knots veering south after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 2 to 4 feet. .MONDAY...Southwest winds 15 to 25 knots increasing to 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ265-092000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 401 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...Northeast winds 5 to 15 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...West winds 5 to 15 knots veering northeast in the afternoon, then veering east late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots backing south after midnight, then veering northwest late. Waves calm to 2 feet. .FRIDAY...North winds 5 to 15 knots veering east in the afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A slight chance of showers after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SUNDAY...Southeast winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves building to 1 to 3 feet. .MONDAY...West winds 10 to 20 knots becoming southwest 20 to 30 knots. Waves subsiding to calm to 2 feet, then building to 3 to 5 feet occasionally to 7 feet. $$ LSZ266-092000- 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 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...North winds 5 to 15 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots. Patchy dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...North winds 5 to 15 knots backing northwest late. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves building to 1 to 3 feet. .MONDAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ267-092000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 401 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...North winds 5 to 15 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots late. Patchy dense fog. Waves calm to 2feet. .TONIGHT...West winds 5 to 15 knots veering northwest after midnight. Waves calm to 2 feet. .FRIDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southeast after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 2 to 4 feet. $$ LSZ261-091400- MAFOR 0909/ Superior West 12200 19204 11100 13800 11100 11300. Waves 1 foot or less. Superior North Central 11600 19604 11700 19704 11700 14600 11700. Waves 1 foot or less. Superior South Central 11100 19104 11600 19604 13800 11700 12600. Waves 1 foot or less. Superior East 11800 19804 11700 19704 15700. 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