FZUS63 KMQT 150801 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 400 AM EDT Wed Apr 15 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 to 29.9 inches settles over the lake today before another low from the Central Plains lifts through Lower Michigan or closer to the Straits at around 29.7 inches. Ridging increases to 29.8 inches over Lake Superior later in the day Thursday before troughing of 29.4 to 29.6 inches moves across the lake Friday through Saturday. This deepens further to 29.0 inches over far northern Quebec by Sunday morning. 30.2 inch ridging builds in over Lake Superior for Sunday night. LSZ162-152000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 400 AM EDT Wed Apr 15 2026 /300 AM CDT Wed Apr 15 2026/ ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT /10 AM CDT/ THIS MORNING... .EARLY THIS MORNING...West winds 5 to 15 knots. Areas of dense fog. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots veering northeast in the afternoon. Areas of dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots backing northeast late. Patchy fog through midnight, then areas of dense fog after midnight. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots veering east in the afternoon. Areas of dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Northeast winds 10 to 20 knots. Waves calm to 2 feet. .FRIDAY...Northeast winds 15 to 25 knots. A chance of rain showers. A chance of thunderstorms by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...North winds 15 to 25 knots becoming northwest 20 to 30 knots after midnight. Rain showers through midnight, then a chance of rain showers, possibly mixed with snow after midnight. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .SATURDAY...West winds 20 to 30 knots veering northwest. A chance of snow showers. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...Northwest winds 20 to 30 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ263-152000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 400 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .EARLY THIS MORNING...North winds less than 10 knots. Areas of dense fog. Waves calm to 2 feet. .TODAY...North winds less than 10 knots veering northeast late. Areas of dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...East winds less than 10 knots. Patchy fog through midnight, then areas of dense fog after midnight. Waves calm to 2 feet. .THURSDAY...Northeast winds less than 10 knots increasing to 5 to 15 knots in the afternoon, then veering east late. Areas of dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. A chance of rain showers by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...Northeast winds 20 to 30 knots backing northwest after midnight. Rain showers through midnight, then a chance of rain showers, possibly mixed with snow after midnight. Waves building to 4 to 7 feet occasionally to 9 feet. .SATURDAY...West gales to 35 knots veering northwest. A chance of snow showers. Waves building to 8 to 11 feet occasionally to 14 feet. .SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to 20 knots. Waves subsiding to 1 to 3 feet. $$ LSZ264-152000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 400 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .EARLY THIS MORNING...North winds 5 to 15 knots. Areas of dense fog. Waves calm to 2 feet. .TODAY...North winds less than 10 knots. Areas of dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds less than 10 knots veering south after midnight. Patchy fog. Waves calm to 2 feet. .THURSDAY...Northeast winds less than 10 knots veering south in the afternoon, then becoming east 5 to 15 knots late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots backing east after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...Southeast winds 15 to 25 knots becoming north 20 to 30 knots after midnight. Rain showers. Waves building to 4 to 7 feet occasionally to 9 feet. .SATURDAY...Northwest gales to 40 knots. A chance of rain showers. A chance of snow showers. Waves building to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Northwest gales to 40 knots diminishing to 10 to 20 knots. Waves subsiding to 2 to 4 feet. $$ LSZ265-152000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 400 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .EARLY THIS MORNING...Northwest winds 10 to 20 knots. Widespread dense fog. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots veering north late. Areas of dense fog through early afternoon, then patchy fog by mid afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds 5 to 15 knots veering southeast after midnight, then backing north late. Areas of fog. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots veering east in the afternoon, then increasing to 10 to 20 knots late. Patchy fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to 2 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...South gales to 35 knots. Rain showers. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SATURDAY...West gales to 40 knots veering northwest. A chance of rain showers. A chance of snow showers. Waves building to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Northwest gales to 40 knots diminishing to 15 to 25 knots. Waves subsiding to 2 to 4 feet. $$ LSZ266-152000- 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- 400 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .EARLY THIS MORNING...Northwest winds 5 to 15 knots. Widespread dense fog. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots veering north in the afternoon. Areas of dense fog through early afternoon, then patchy fog by mid afternoon. Waves calm to 2 feet. .TONIGHT...North winds 5 to 15 knots. Patchy fog. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots backing north in the afternoon, then veering east late. Patchy fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...South gales to 35 knots. Rain showers. Waves building to 4 to 8 feet occasionally to 10 feet. .SATURDAY...Northwest gales to 40 knots. A chance of rain showers. A chance of snow showers. Waves building to 12 to 17 feet occasionally to 21 feet. .SUNDAY...Northwest gales to 40 knots diminishing to 15 to 25 knots. Waves subsiding to 4 to 7 feet occasionally to 9 feet. $$ LSZ267-152000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 400 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .EARLY THIS MORNING...East winds 5 to 15 knots. Widespread dense fog. Waves calm to 2 feet. .TODAY...North winds 5 to 15 knots backing northwest in the afternoon. Areas of dense fog. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots backing southwest after midnight, then veering north late. Areas of dense fog. A slight chance of rain showers. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots backing northwest in the afternoon. Areas of dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...North winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...Southeast winds 20 to 30 knots. A chance of rain showers through midnight. Rain showers after midnight. Waves building to 3 to 6 feet occasionally to 8 feet. .SATURDAY...West gales to 35 knots. Rain showers likely. A chance of snow showers. Waves building to 12 to 17 feet occasionally to 21 feet. .SUNDAY...Northwest gales to 35 knots diminishing to 15 to 25 knots. A chance of snow showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet. $$ LSZ261-151400- MAFOR 1509/ Superior West 12704 11800 12100 12200 11204. Waves 1 foot or less. Superior North Central 12804 13800 11100 11200 11400. Waves 1 foot or less. Superior South Central 13714 11803 11800 11100 11203 11400. Waves 1 foot or less. Superior East 13804 11803 11703 11803 11704 11804. 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