FZUS63 KMQT 162001 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 401 PM EDT Fri Oct 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... Ridging builds to 30.4 inches over Lake Superior this evening as a 30.6 inch parent high continues east over the Plains tonight. The high then slides south of the Great Lakes at 30.5 inches by Saturday night as a 29.2 inch Alberta Clipper moves through the northern Canadian Prairie Provinces towards Hudson Bay, deepening to 29.0 inches by the time it arrives at Hudson Bay on Sunday. This low is expected to bring weak 30.0 inch troughing to northern Lake Superior throughout the day on Sunday. As the low continues east over Hudson Bay and weakens with time Sunday night into Monday afternoon, expect high pressure ridging of 30.3 inches to return to the Upper Great Lakes by Monday. The high pressure ridging strengthens to 30.4 inches over Lake Superior by Tuesday as the now 30.5 inch parent high over northern Ontario continues east into northern Quebec. As the high continues to retreat eastward, the ridging over Lake Superior may potentially weaken to 30.2 inches by Wednesday. LSZ162-170800- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 401 PM EDT Fri Oct 16 2026 /301 PM CDT Fri Oct 16 2026/ .LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 3 to 6 feet occasionally to 8 feet subsiding to 2 to 4 feet. .TONIGHT...Northwest winds 10 to 20 knots backing west after midnight, then becoming southwest 15 to 25 knots late. Waves subsiding to calm to 2 feet, then building to 3 to 5 feet occasionally to 7 feet. .SATURDAY...Southwest winds 20 to 30 knots increasing to 30 knots with a few gale force gusts to 35 knots possible in the afternoon, then diminishing to 20 to 30 knots late. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. .SATURDAY NIGHT...Southwest winds to 30 knots with a few gale force gusts to 40 knots possible. Waves building to 7 to 10 feet occasionally to 13 feet. .SUNDAY...Southwest gales to 40 knots. Waves building to 8 to 11 feet occasionally to 14 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. .SUNDAY NIGHT...Southwest winds 15 to 25 knots becoming west 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .MONDAY...Northwest winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Northeast winds less than 10 knots increasing to 5 to 15 knots after midnight. Waves calm to 2 feet. .TUESDAY...East winds 5 to 15 knots veering south. Waves calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots veering southwest. Waves calm to 2 feet. $$ LSZ263-170800- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 401 PM EDT Fri Oct 16 2026 .LATE THIS AFTERNOON...North winds 15 to 25 knots. Waves 5 to 8 feet occasionally to 10 feet subsiding to 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 10 to 20 knots becoming west 5 to 15 knots after midnight, then increasing to 15 to 25 knots late. Waves subsiding to calm to 2 feet, then building to 3 to 6 feet occasionally to 8 feet. .SATURDAY...Southwest winds 20 to 30 knots increasing to 30 knots with a few gale force gusts to 35 knots possible in the afternoon. Waves building to 8 to 11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet occasionally to 11 feet. .SATURDAY NIGHT...Southwest winds to 30 knots with a few gale force gusts to40 knots possible. Waves subsiding to 5 to 8 feet occasionally to 10 feet, then building to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Southwest gales to 40 knots. Waves building to 10 to 14 feet occasionally to 18 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Southwest winds 15 to 25 knots becoming west 10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet. .MONDAY...Northwest winds 5 to 15 knots becoming east less than 10 knots by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...East winds less than 10 knots. Waves calm to 2 feet. .TUESDAY...East winds 5 to 15 knots veering south. Waves calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ264-170800- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 401 PM EDT Fri Oct 16 2026 ...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON... .LATE THIS AFTERNOON...North winds 20 to 30 knots. Waves 6 to 10 feet occasionally to 13 feet. .TONIGHT...Northwest winds 15 to 25 knots diminishing to 5 to 15 knots after midnight, then becoming west 15 to 25 knots late. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet. .SATURDAY...West winds 20 to 30 knots increasing to 30 knots with a few gale force gusts to 35 knots possible in the afternoon, then diminishing to 20 to 30 knots late. Waves building to 8 to 11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet occasionally to 11 feet. .SATURDAY NIGHT...Southwest winds 20 to 30 knots increasing to 30 knots with a few gale force gusts to 40 knots possible after midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet, then building to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Southwest gales to 40 knots. Waves building to 10 to 14 feet occasionally to 18 feet, then subsiding to 7 to 10 feet occasionally to 13 feet. .SUNDAY NIGHT...Southwest winds 15 to 25 knots becoming west 10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet. .MONDAY...Northwest winds 5 to 15 knots diminishing to less than 10 knots by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...South winds less than 10 knots backing east after midnight. Waves calm to 2 feet. .TUESDAY...East winds 5 to 15 knots veering south. Waves calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves building to 1 to 3 feet. $$ LSZ265-170800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 401 PM EDT Fri Oct 16 2026 ...GALE WARNING IN EFFECT UNTIL 9 PM EDT THIS EVENING... .LATE THIS AFTERNOON...North gales to 35 knots. Waves 10 to 14 feet occasionally to 18 feet subsiding to 9 to 12 feet occasionally to 15 feet. .TONIGHT...North winds 20 to 30 knots becoming northwest 10 to 20 knots after midnight, then becoming west 15 to 25 knots late. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .SATURDAY...West winds 20 to 30 knots becoming southwest 15 to 25 knots late. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. .SATURDAY NIGHT...Southwest winds 20 to 30 knots increasing to gales to 35 knots late. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...Southwest gales to 35 knots diminishing to 20 to 30 knots by mid afternoon. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 15 to 25 knots becoming west 10 to 20 knots after midnight. Waves subsiding to calm to 2 feet. .MONDAY...West winds 5 to 15 knots veering northeast by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knotsveering southeast after midnight. Waves calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots becoming south 10 to 20 knots. Waves calm to 2 feet. .WEDNESDAY...South winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ266-170800- 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 Fri Oct 16 2026 ...GALE WARNING IN EFFECT UNTIL 9 PM EDT THIS EVENING... .LATE THIS AFTERNOON...North gales to 40 knots. Waves 11 to 15 feet occasionally to 19 feet subsiding to 10 to 14 feet occasionally to 18 feet. .TONIGHT...North winds 20 to 30 knots becoming northwest 10 to 20 knots after midnight, then backing west late. Waves subsiding to 2 to 4 feet. .SATURDAY...West winds 20 to 30 knots backing southwest late. Waves building to 8 to 11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet occasionally to 11 feet. .SATURDAY NIGHT...Southwest winds 15 to 25 knots increasing to 20 to 30 knots after midnight. Waves subsiding to 4 to 7 feet occasionally to 9 feet, then building to 6 to 9 feet occasionally to 11 feet. .SUNDAY...Southwest winds 20 to 30 knots. Waves building to 9 to 12 feet occasionally to 15 feet, then subsiding to 7 to 10 feet occasionally to 13 feet. .SUNDAY NIGHT...Southwest winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet. .MONDAY...West winds 5 to 15 knots veering north by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...East winds less than 10 knots increasing to 5 to 15 knots after midnight. Waves calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet. .WEDNESDAY...South winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. $$ LSZ267-170800- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 401 PM EDT Fri Oct 16 2026 ...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING... .LATE THIS AFTERNOON...North gales to 40 knots. Waves 10 to 14 feet occasionally to 18 feet subsiding to 9 to 12 feet occasionally to 15 feet. .TONIGHT...North gales to 35 knots diminishing to 15 to 25 knots after midnight, then becoming west 10 to 20 knots late. Waves subsiding to 2 to 4 feet. .SATURDAY...West winds 15 to 25 knots becoming southwest 20 to 30 knots in the afternoon, then diminishing to 15 to 25 knots late. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SATURDAY NIGHT...Southwest winds 15 to 25 knots increasing to gales to 35 knots. Waves building to 5 to 8 feet occasionally to 10 feet. .SUNDAY...Southwest gales to 35 knots diminishing to 20 to 30 knots by mid afternoon. Waves building to 6 to 9 feet occasionally to 11 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SUNDAY NIGHT...Southwest winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet. .MONDAY...Southwest winds 5 to 15 knots veering west by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots veering east after midnight. Waves calm to 2 feet. .TUESDAY...East winds 5 to 15 knots veering southeast. Waves calm to 2 feet. .WEDNESDAY...South winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 1 to 3 feet. $$ LSZ261-170200- MAFOR 1621/ Superior West 12720 11710 11620 12540 11550 11540. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight. Waves 3 to 6 feet building to 6 to 10 feet Saturday. Superior North Central 11840 11730 11720 11610 11630 11640 12650. Waves 6 to 10 feet subsiding to 2 to 3 feet tonight. Waves 3 to 6 feet building to 8 to 11 feet Saturday. Superior South Central...GALE WARNING IN EFFECT...11850 11840 11730 11710 11630 13640. Waves 9 to 13 feet subsiding to 3 to 5 feet tonight. Waves 2 to 4 feet building to 3 to 6 feet Saturday. Superior East...GALE WARNING IN EFFECT...11850 11840 11830 11710 11620 12630 11530. Waves 8 to 12 feet subsiding to 3 to 5 feet tonight. Waves 3 to 6 feet building to 5 to 7 feet Saturday. $$ 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