FZUS63 KMQT 161401 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1000 AM EDT Thu Apr 16 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 ridging of around 29.8 inches persists over Lake Superior today and tonight, then expect height falls into Friday morning before troughing averaging 29.5 inches moves across the lake Friday evening and Saturday morning. Ridging builds over Lake Superior the remainder of Saturday and throughout Sunday, reaching about 30.3 inches Monday morning. This gives way quickly to troughing Monday evening as a low swings southeast through Ontario toward James Bay, decreasing to around 29.6 by Monday evening. LSZ162-162000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1000 AM EDT Thu Apr 16 2026 /900 AM CDT Thu Apr 16 2026/ ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT /7 PM CDT/ THIS EVENING... .REST OF TODAY...Southwest winds 5 to 15 knots backing east late. Areas of dense fog by late morning, then patchy fog by mid afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds 10 to 20 knots. Patchy fog. A slight chance of rain and snow showers after midnight. Waves building to 1 to 3 feet. .FRIDAY...East winds 10 to 20 knots backing northeast in the afternoon, then backing northwest late. Patchy fog through early afternoon. Rain showers and a chance of thunderstorms by mid afternoon. Waves 1 to 3 feet. .FRIDAY NIGHT...West winds 15 to 25 knots increasing to 20 to 30 knots after midnight. A chance of rain showers, possibly mixed with snow and thunderstorms through midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .SATURDAY...West winds 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. .SATURDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming north 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming west 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. $$ LSZ263-162000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1000 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .REST OF TODAY...Southwest winds less than 10 knots increasing to 5 to 15 knots in the afternoon, then backing east late. Areas of dense fog. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots. Patchy fog. A slight chance of rain showers after midnight. Waves building to 1 to 3 feet. .FRIDAY...East winds 10 to 20 knots becoming south 15 to 25 knots late. Patchy fog through early afternoon. A chance of showers and thunderstorms by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .FRIDAY NIGHT...West winds 20 to 30 knots. Rain showers likely and a slight chance of thunderstorms through midnight, then a slight chance of rain showers, snow showers and sleet after midnight. Waves building to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West winds 20 to 30 knots increasing to gales to 35 knots by mid afternoon. Waves building to 7 to 10 feet occasionally to 13 feet. .SATURDAY NIGHT...Northwest gales to 35 knots. Waves subsiding to 4 to 7 feet occasionally to 9 feet. .SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to 20 knots. Waves subsiding to calm to 2 feet. .MONDAY...South winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ264-162000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1000 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .REST OF TODAY...Southwest winds less than 10 knots veering west in the afternoon, then becoming east 5 to 15 knots late. Areas of dense fog. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots veering southeast after midnight, then increasing to 10 to 20 knots late. Areas of dense fog. A slight chance of rain showers after midnight. Waves building to 1 to 3 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 30 knots with a few gale force gusts to 35 knots possible. Patchy fog through early afternoon. A chance of rain showers and a slight chance of thunderstorms by mid afternoon. Waves building to 6 to 9 feet occasionally to 11 feet. .FRIDAY NIGHT...South gales to 35 knots becoming west 20 to 30 knots after midnight. Rain showers and a slight chance of thunderstorms through midnight, then a chance of rain showers after midnight. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West gales to 35 knots. Waves building to 5 to 9 feet occasionally to 11 feet. .SATURDAY NIGHT...Northwest gales to 35 knots. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to 20 knots. Waves subsiding to 1 to 3 feet. .MONDAY...South winds 10 to 20 knots increasing to 20 to 30 knots. Waves subsiding to calm to 2 feet, then building to 4 to 7 feet occasionally to 9 feet. $$ LSZ265-162000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1000 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .REST OF TODAY...West winds 5 to 15 knots backing east in the afternoon. Areas of dense fog. Waves calm to 2 feet. .TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to 25 knots late. Areas of dense fog. Waves building to 1 to 3 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 30 knots with a few gale force gusts to 35 knots possible. Patchy fog through early afternoon. A slight chance of rain showers by mid afternoon. Waves building to 6 to 9 feet occasionally to 11 feet. .FRIDAY NIGHT...South gales to 35 knots veering west after midnight. Rain showers and a slight chance of thunderstorms through midnight, then a chance of rain showers after midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet. .SATURDAY...West gales to 40 knots. A slight chance of rain showers and sleet through early afternoon. A slight chance of snow showers. Waves building to 6 to 9 feet occasionally to 11 feet. .SATURDAY NIGHT...Northwest gales to 40 knots. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .SUNDAY...Northwest gales to 35 knots diminishing to 10 to 20 knots. Waves subsiding to 1 to 3 feet. .MONDAY...Southeast winds 10 to 20 knots becoming south 20 to 30 knots. Waves subsiding to calm to 2 feet, then building to 3 to 6 feet occasionally to 8 feet. $$ LSZ266-162000- 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- 1000 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .REST OF TODAY...Northwest winds 5 to 15 knots veering east late. Areas of dense fog. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots becoming southeast 10 to 20 knots after midnight. Areas of dense fog. Waves building to 1 to 3 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon, then becoming south to 30 knots with a few gale force gusts to 40 knots possible late. Patchy fog through early afternoon. Waves building to 6 to 9 feet occasionally to 11 feet. .FRIDAY NIGHT...South gales to 40 knots becoming west gales to 35 knots after midnight. A chance of thunderstorms through midnight. Rain showers. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West gales to 40 knots. A slight chance of rain showers through early afternoon. A slight chance of snow showers. Waves building to 10 to 14 feet occasionally to 18 feet. .SATURDAY NIGHT...Northwest gales to 40 knots. A chance of snow showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Northwest gales to 35 knots diminishing to 15 to 25 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .MONDAY...South winds 10 to 20 knots increasing to gales to 35 knots. Waves subsiding to 1 to 3 feet, then building to 5 to 8 feet occasionally to 10 feet. $$ LSZ267-162000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1000 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .REST OF TODAY...Northwest winds 5 to 15 knots. Patchy fog. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots veering southeast after midnight. Areas of dense fog. Waves calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots increasing to 20 to 30 knots. Patchy fog through early afternoon. Waves building to 4 to 7 feet occasionally to 9 feet. .FRIDAY NIGHT...Southeast gales to 35 knots veering south after midnight. Rain showers and a slight chance of thunderstorms. Waves building to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West gales to 40 knots. A chance of rain showers. A slight chance of snow showers by mid afternoon. Waves building to 10 to 14 feet occasionally to 18 feet. .SATURDAY NIGHT...West gales to 35 knots veering northwest after midnight. A chance of snow showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Northwest gales to 35 knots diminishing to 15 to 25 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .MONDAY...South winds 10 to 20 knots increasing to 20 to 30 knots. Waves subsiding to 1 to 3 feet, then building to 5 to 8 feet occasionally to 10 feet. $$ LSZ261-162000- MAFOR 1615/ Superior West 11504 12200 11110 11110 19114 13210. Waves 2 feet or less this afternoon and tonight. Waves 2 to 3 feet Friday morning. Superior North Central 12604 11304 11214 11324 11314 11324 11330. Waves 2 feet or less this afternoon and tonight. Waves 1 to 3 feet building to 2 to 4 feet Friday morning. Superior South Central 11604 11104 11210 12314 11324 12330. Waves 2 feet or less this afternoon and tonight. Waves 2 to 4 feet building to 3 to 5 feet Friday morning. Superior East 12700 11800 11200 11304 11314 11324 11320. Waves 1 foot or less this afternoon and tonight. Waves 1 to 3 feet Friday morning. $$ 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