FZUS63 KMQT 091401 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1001 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... Weak troughing of 29.9 inches over Lake Superior today will give way to weak high pressure of 30.0 inches building over Hudson Bay and northern Ontario tonight and Friday. High pressure continues to build to 30.1 to 30.2 inches over the lake this weekend as the high shifts south to the Lower Great Lakes through Sunday. A strong low of around 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- 1001 AM EDT Thu Jul 9 2026 /901 AM CDT Thu Jul 9 2026/ ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT /10 AM CDT/ THIS MORNING... .REST OF TODAY...Northeast winds 5 to 15 knots veering east in the afternoon, then backing northeast late. Patchy dense fog by mid afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds 5 to 15 knots veering east late. Patchy dense fog after midnight. 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. $$ LSZ263-092000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1001 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...North winds less than 10 knots veering northeast in the afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds less than 10 knots backing west after midnight, then backing east late. Patchy dense fog. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots backing northeast in the afternoon, then becoming east 5 to 15 knots late. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots backing northeast after midnight. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .SATURDAY...South winds less than 10 knots backing east by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...East winds less than 10 knots becoming southwest 5 to 15 knots after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 2 to 4 feet. .MONDAY...Southwest winds 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ264-092000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1001 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...Northwest winds less than 10 knots veering north in the afternoon, then backing west late. Patchy dense fog. Waves calm to 2 feet. .TONIGHT...West winds less than 10 knots veering northwest after midnight, then backing west 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. $$ LSZ265-092000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1001 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...Northeast winds 5 to 15 knots veering east late. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots veering south after midnight, then backing north late. Waves calm to 2 feet. .FRIDAY...North winds 5 to 15 knots veering east in the afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A slight chance of showers after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. A slight chance of showers through early afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SUNDAY...Southeast winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves building to 1 to 3 feet. .MONDAY...West winds 10 to 20 knots becoming southwest 20 to 30 knots. Waves subsiding to calm to 2 feet, then building to 3 to 5 feet occasionally to 7 feet. $$ 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- 1001 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots veering north late. 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. $$ LSZ267-092000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1001 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southeast after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 2 to 4 feet. $$ LSZ261-092000- MAFOR 0915/ Superior West 11100 11200 19204 13100 11400 19404 11200 19204 11200. Waves 1 foot or less.Superior North Central 12700 19704 11600 19604 11600 11700 12700 19704 11200. Waves 1 foot or less. Superior South Central 12100 11800 11600 11500 13800. Waves 1 foot or less. Superior East 15700 12800. 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