FZUS63 KMQT 191401 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1001 AM EDT Tue May 19 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 over eastern Lake Superior this morning moves to the Ontario/Quebec line south of James Bay at 29.6 inches by this evening. Afterwards, a 30.2 inch high over the Northern Plains builds to 30.4 inches tonight 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. LSZ162-192000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1001 AM EDT Tue May 19 2026 /901 AM CDT Tue May 19 2026/ .REST OF TODAY...West winds 10 to 20 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...West winds 5 to 15 knots backing south in the afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...Southeast 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...Northeast winds 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SATURDAY...Northeast winds 5 to 15 knots. A chance of rain showers. Waves calm to 2 feet. $$ LSZ263-192000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1001 AM EDT Tue May 19 2026 .REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon, then increasing to 10 to 20 knots late. Waves 3 to 5 feet occasionally to 7 feet subsiding to 2 to 4 feet. .TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...Northwest winds 5 to 15 knots backing southwest in the afternoon, then backing south late. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...East winds 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ264-192000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1001 AM EDT Tue May 19 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...Northwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. A slight chance of rain showers by late morning. Waves 3 to 5 feet occasionally to 7 feet. .TONIGHT...North winds 10 to 20 knots backing northwest after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...Northwest winds 5 to 15 knots backing southwest late. 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 increasing to 10 to 20 knots. Waves 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. $$ LSZ265-192000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1001 AM EDT Tue May 19 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...West winds 20 to 30 knots becoming northwest 15 to 25 knots late. Patchy fog by late morning. A slight chance of rain showers by late morning. Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .TONIGHT...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 20 knots veering north in the afternoon, then becoming southeast 5 to 15 knots late. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves building to 1 to 3 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots becoming south 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 10 to 20 knots. Waves building to 1 to 3 feet. .SATURDAY...East winds 10 to 20 knots veering southeast. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. $$ LSZ266-192000- 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 Tue May 19 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...West winds 20 to 30 knots veering northwest in the afternoon. Patchy fog by late morning. A slight chance of rain showers. Waves 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 20 to 30 knots 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. .WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots in the afternoon, then becoming west 5 to 15 knots late. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after midnight. 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 10 to 20 knots veering south after midnight. Waves 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 building to 2 to 4 feet, then subsiding to calm to 2 feet. $$ LSZ267-192000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1001 AM EDT Tue May 19 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON... .REST OF TODAY...South winds 15 to 25 knots becoming west 20 to 30 knots in the afternoon, then veering northwest late. Patchy dense fog. A chance of rain showers. Waves 2 to 4 feet building to 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 20 to 30 knots. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves subsiding to 2 to 4 feet. .WEDNESDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots becoming southeast 5 to 15 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ261-192000- MAFOR 1915/ Superior West 11610 12620 13710 12700. Waves 3 to 5 feet subsiding to 2 to 4 feet this afternoon. Waves 1 to 3 feet tonight. Waves 1 foot or less Wednesday morning. Superior North Central 14730 11730 12720 11710. Waves 3 to 5 feet this afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet Wednesday morning. Superior South Central 11630 11740 14730 11730 11720. Waves 3 to 5 feet this afternoon and tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Wednesday morning. Superior East 11534 11640 13730 11740 11730 11720. A chance of rain showers this afternoon. Waves 3 to 6 feet this afternoon. Waves 4 to 7 feet tonight. Waves 3 to 6 feet Wednesday 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