FZUS63 KMQT 190201 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1001 PM EDT Mon May 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 29.6 inch low lifting from the Central Plains this evening reaches Lake Superior by Tuesday morning. Afterwards, a 30.2 inch high over the Northern Plains builds to 30.4 inches Tuesday night into Wednesday as it tracks eastward into the Upper Great Lakes. The high pressure shifts east on Thursday while leaving lingering ridging of at least 30.2 inches over Lake Superior into Friday. A 29.9 inch low lifts into the Lower Great Lakes from the Southern Plains on Saturday, but 30.1 inch ridging persists over Lake Superior. LSZ162-190800- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1001 PM EDT Mon May 18 2026 /901 PM CDT Mon May 18 2026/ .REST OF TONIGHT...Northeast winds 15 to 25 knots backing north late. Patchy fog. A chance of rain showers by midnight. A chance of thunderstorms. Rain showers likely after midnight. Waves 2 to 4 feet building to 3 to 6 feet occasionally to 8 feet. .TUESDAY...West winds 10 to 20 knots. A slight chance of rain showers through early afternoon. Waves subsiding to 1 to 3 feet. .TUESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...Northwest winds 5 to 15 knots backing south by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming south less than 10 knots after midnight. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east by mid 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 backing northeast. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SATURDAY...Northeast winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ263-190800- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1001 PM EDT Mon May 18 2026 .REST OF TONIGHT...Northeast winds 15 to 25 knots. Patchy fog. A chance of rain showers by midnight. A chance of thunderstorms. Rain showers after midnight. Waves 2 to 4 feet building to 3 to 6 feet occasionally to 8 feet. .TUESDAY...North winds 10 to 20 knots backing west in the afternoon. Patchy fog through early afternoon. A chance of rain showers through early afternoon. Waves subsiding to 2 to 4 feet. .TUESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...Northwest winds 5 to 15 knots becoming south 10 to 20 knots by mid afternoon. Waves building to 1 to 3 feet. .WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...East winds 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SATURDAY...East winds 5 to 15 knots. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ264-190800- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1001 PM EDT Mon May 18 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT TUESDAY... .REST OF TONIGHT...Northeast winds 15 to 25 knots. Patchy dense fog. A chance of rain showers by midnight. A chance of thunderstorms. Rain showers after midnight. Waves 3 to 6 feet occasionally to 8 feet. .TUESDAY...North winds 15 to 25 knots backing northwest in the afternoon. Patchy dense fog through early afternoon. A chance of rain showers through early afternoon. Waves subsiding to 2 to 4 feet. .TUESDAY NIGHT...Northwest winds 10 to 20 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northwest winds 5 to 15 knots backing southwest by mid afternoon. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SATURDAY...East winds 5 to 15 knots veering southeast. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ265-190800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1001 PM EDT Mon May 18 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT TUESDAY... .REST OF TONIGHT...Northeast winds 10 to 20 knots becoming east 5 to 15 knots after midnight, then increasing to 10 to 20 knots late. Areas of dense fog. A chance of rain showers by midnight. A chance of thunderstorms. Rain showers likely after midnight. Waves calm to 2 feet building to 1 to 3 feet. .TUESDAY...West winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon, then veering northwest late. Patchy dense fog through early afternoon. A chance of rain showers through early afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding to 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to 15 knots by mid afternoon. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...South winds 10 to 20 knots becoming southeast 15 to 25 knots by mid afternoon. Waves building to 1 to 3 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots becoming south 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SATURDAY...East winds 10 to 20 knots veering southeast. Waves subsiding to calm to 2 feet. $$ LSZ266-190800- 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 PM EDT Mon May 18 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT TUESDAY... .REST OF TONIGHT...Northeast winds 10 to 20 knots veering southeast late. Areas of dense fog. A chance of rain showers and a slight chance of thunderstorms. Waves 3 to 5 feet occasionally to 7 feet subsiding to 2 to 4 feet. .TUESDAY...South winds 15 to 25 knots becoming northwest 20 to 30 knots in the afternoon. Areas of dense fog through early afternoon. A chance of rain showers and a slight chance of thunderstorms through early afternoon. Waves building to 5 to 8 feet occasionally to 10 feet. .TUESDAY NIGHT...Northwest winds 20 to 30 knots. Waves subsiding to 4 to 7 feet occasionally to 9 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots by mid afternoon. Waves subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots becoming southeast 10to 20 knots by mid afternoon. Waves building to 1 to 3 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 10 to 20 knots. Waves building to 1 to 3 feet. .SATURDAY...East winds 10 to 20 knots veering southeast. Waves subsiding to calm to 2 feet. $$ LSZ267-190800- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1001 PM EDT Mon May 18 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT TUESDAY... .REST OF TONIGHT...East winds 10 to 20 knots becoming southeast 15 to 25 knots late. Areas of dense fog. A slight chance of rain showers by midnight. A chance of thunderstorms. Rain showers likely after midnight. Waves calm to 2 feet building to 1 to 3 feet. .TUESDAY...South winds 15 to 25 knots becoming west 20 to 30 knots in the afternoon, then increasing to 30 knots with a few gale force gusts to 35 knots possible late. Areas of dense fog through early afternoon. A slight chance of thunderstorms through early afternoon. A slight chance of rain showers. Waves building to 6 to 9 feet occasionally to 11 feet. .TUESDAY NIGHT...Northwest winds 20 to 30 knots. Waves subsiding to 4 to 8 feet occasionally to 10 feet. .WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots by mid afternoon. Waves subsiding to 2 to 4 feet. .WEDNESDAY NIGHT...Northwest winds 5 to 15 knots backing south after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots veering southeast. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ261-190800- MAFOR 1903/ Superior West 11130 11136 11836 11720 11610 12620 11720. A chance of thunderstorms overnight. Waves 2 to 4 feet building to 3 to 6 feet overnight. Waves 3 to 6 feet subsiding to 2 to 4 feet Tuesday. Waves 2 to 3 feet Tuesday evening. Superior North Central 11130 19134 12136 19134 11830 19834 14730. Waves 3 to 6 feet. Superior South Central 11114 11216 19214 11326 19324 11534 11640 12740 11730. Waves 1 to 3 feet overnight. Waves 2 to 4 feet building to 4 to 7 feet Tuesday. Waves 3 to 6 feet Tuesday evening. Superior East 12224 11326 19324 11424 11630 19634 11640 12740. A chance of thunderstorms Tuesday morning. Waves 1 to 2 feet building to 2 to 4 feet overnight. Waves 2 to 4 feet building to 5 to 8 feet Tuesday. Waves 5 to 8 feet Tuesday evening. $$ 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