FZUS63 KMQT 181401 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1000 AM EDT Sat Jul 18 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 29.7 inch low will move from eastern Ontario to northern New England through tonight, deepening to 29.3 inches. Weak ridging of around 30.0 inches returns to the Great Lakes this evening and persists through Sunday. A strong low ranging from 29.1 to 29.4 inches over northern Ontario looks to bring troughing of around 29.5 inches over Lake Superior on Monday. Then a 30.1 inch ridge descends southeast over the Midwest Tuesday through Wednesday night. LSZ162-182000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1001 AM EDT Sat Jul 18 2026 /901 AM CDT Sat Jul 18 2026/ .REST OF TODAY...Northwest winds 5 to 15 knots backing southwest in the afternoon. Patchy smoke. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots becoming north less than 10 knots after midnight, then backing southwest late. Patchy smoke. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing south late. Patchy smoke. Waves calm to 2 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A slight chance of showers through midnight, then showers likely and a slight chance of thunderstorms after midnight. Waves calm to 2 feet. .MONDAY...Southwest winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. A chance of showers through early afternoon. A chance of thunderstorms. Showers likely by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .MONDAY NIGHT...West winds 15 to 25 knots. A chance of showers through midnight. Waves subsiding to 1 to 3 feet. .TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots. Waves subsiding to calm to 2 feet. .WEDNESDAY...Southwest winds 5 to 15 knots veering west. Waves calm to 2 feet. $$ LSZ263-182000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1001 AM EDT Sat Jul 18 2026 ...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT SUNDAY... .REST OF TODAY...North winds 5 to 15 knots backing west in the afternoon, then backing southwest late. Smoke. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots backing south after midnight. Areas of smoke. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing south late. Areas of smoke. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest 15 to 25 knots after midnight. Patchy smoke through midnight. A chance of showers and a slight chance of thunderstorms. Waves building to 2 to 4 feet. .MONDAY...Southwest winds 20 to 30 knots diminishing to 15 to 25 knots by mid afternoon. Showers likely and a slight chance of thunderstorms. Waves building to 3 to 6 feet occasionally to 8 feet. .MONDAY NIGHT...West winds 15 to 25 knots. A chance of showers. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots. Waves subsiding to calm to 2 feet. .WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. Waves calm to 2 feet. $$ LSZ264-182000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1001 AM EDT Sat Jul 18 2026 ...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT SUNDAY... .REST OF TODAY...North winds 5 to 15 knots backing west late. Smoke. Waves 1 to 3 feet subsiding to calm to 2 feet. .TONIGHT...West winds 5 to 15 knots becoming south less than 10 knots late. Areas of smoke. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots. Areas of smoke. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest 15 to 25 knots after midnight. Areas of smoke through midnight. A chance of showers through midnight. A slight chance of thunderstorms. Showers likely after midnight. Waves building to 2 to 4 feet. .MONDAY...Southwest winds 15 to 25 knots. Showers. A chance of thunderstorms by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .MONDAY NIGHT...West winds 15 to 25 knots. A chance of showers. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...Northwest gales to 35 knots diminishing to 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ265-182000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1001 AM EDT Sat Jul 18 2026 ...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT SUNDAY... .REST OF TODAY...Northwest winds 20 to 30 knots diminishing to 10 to 20 knots. Smoke. Waves 3 to 5 feet occasionally to 7 feet subsiding to 1 to 3 feet. .TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then backing south late. Smoke. Waves subsiding to calm to 2 feet. .SUNDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots in the afternoon. Smoke. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest 20 to 30 knots after midnight. Areas of smoke through midnight. A chance of showers and a slight chance of thunderstorms after midnight. Waves building to 1 to 3 feet. .MONDAY...Southwest winds 20 to 30 knots. Showers. A chance of thunderstorms by mid afternoon. Waves building to 2 to 4 feet. .MONDAY NIGHT...West winds 20 to 30 knots increasing to gales to 35 knots after midnight. Showers likely and a chance of thunderstorms through midnight. Waves building to 4 to 7 feet occasionally to 9 feet. .TUESDAY...Northwest gales to 40 knots. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. .WEDNESDAY...Northwest gales to 35 knots becoming west 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ266-182000- 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 Sat Jul 18 2026 ...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT SUNDAY... .REST OF TODAY...Northwest winds 15 to 25 knots. Patchy smoke by late morning, then smoke by mid afternoon. Waves 3 to 5 feet occasionally to 7 feet subsiding to 2 to 4 feet. .TONIGHT...Northwest winds 10 to 20 knots becoming north 5 to 15 knots after midnight, then backing southwest late. Smoke. Waves subsiding to calm to 2 feet. .SUNDAY...South winds 5 to 15 knots. Smoke. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Smoke through midnight. A chance of showers and a slight chance of thunderstorms after midnight. Waves building to 2 to 4 feet. .MONDAY...South winds 20 to 30 knots diminishing to 15 to 25 knots by mid afternoon. Showers and a chance of thunderstorms. Waves building to 3 to 5 feet occasionally to 7 feet. .MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west gales to 35 knots after midnight. Showers likely and a chance of thunderstorms through midnight. Waves subsiding to 2 to 4 feet,then building to 4 to 7 feet occasionally to 9 feet. .TUESDAY...Northwest gales to 40 knots. Waves building to 8 to 11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet occasionally to 11 feet. .WEDNESDAY...Northwest gales to 35 knots becoming west 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ267-182000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1001 AM EDT Sat Jul 18 2026 ...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT SUNDAY... .REST OF TODAY...Northwest winds 15 to 25 knots. Patchy smoke. Waves 3 to 5 feet occasionally to 7 feet. .TONIGHT...Northwest winds 10 to 20 knots becoming north 5 to 15 knots after midnight, then backing west late. Smoke. Waves subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing southeast late. Areas of smoke. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Areas of smoke through midnight. A chance of showers and a slight chance of thunderstorms after midnight. Waves building to 2 to 4 feet. .MONDAY...South winds 15 to 25 knots. A chance of showers through early afternoon. A slight chance of thunderstorms. Showers by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after midnight. Showers likely and a chance of thunderstorms through midnight, then a chance of showers after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...Northwest gales to 35 knots. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. .WEDNESDAY...Northwest winds 20 to 30 knots becoming west 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ261-182000- MAFOR 1815/ Superior West 11600 13500 12400 12500. Waves 2 feet or less. Superior North Central 11720 11710 12610 11600 11500 12400. Waves 1 to 3 feet this afternoon. Waves 2 feet or less tonight and Sunday morning. Superior South Central 12730 12720 11710 11600 12400. Waves 3 to 5 feet subsiding to 2 to 4 feet this afternoon. Waves 1 to 3 feet subsiding to 1 foot or less tonight. Waves 1 foot or less Sunday morning. Superior East 14720 11810 11700 12500. Waves 3 to 5 feet subsiding to 2 to 4 feet this afternoon. Waves 2 to 4 feet subsiding to 1 to 2 feet tonight. Waves 1 to 2 feet Sunday 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