FZUS63 KMQT 192001 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 401 PM 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 northeast of Lake Superior moves to Quebec at 29.6 inches 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 through Friday. A 29.9 inch low lifts into the Lower Great Lakes from the Southern Plains Friday night and Saturday, but 30.1 inch ridging likely persists over Lake Superior the remainder of the weekend. LSZ162-200800- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 401 PM EDT Tue May 19 2026 /301 PM CDT Tue May 19 2026/ .LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 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 backing northeast after midnight. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots. 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 becoming northeast 15 to 25 knots by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...Northeast winds 10 to 20 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SATURDAY...Northeast winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of rain showers. Waves subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ263-200800- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 401 PM EDT Tue May 19 2026 .LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 2 to 4 feet. .TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...Northwest winds 5 to 15 knots backing southwest in the afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south late. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .SATURDAY...East winds 5 to 15 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm to 2 feet. $$ LSZ264-200800- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 401 PM EDT Tue May 19 2026 .LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 2 to 4 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...Southwest 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 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. Waves building to 1 to 3 feet. .SATURDAY...East winds 10 to 20 knots becoming southeast 5 to 15 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ265-200800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 401 PM EDT Tue May 19 2026 .LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 2 to 4 feet. .TONIGHT...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to 15 knots in the afternoon, then veering southeast late. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots becoming east 15 to 25 knots by mid afternoon. Waves building to 1 to 3 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots becoming south 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...East winds 10 to 20 knots. Waves building to 2 to 4 feet. .SATURDAY...East winds 15 to 25 knots becoming southeast 10 to 20 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to 2 feet. .SUNDAY...West winds 10 to 20 knots backing south. Waves calm to 2 feet. $$ LSZ266-200800- 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 Tue May 19 2026 .LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots late. Waves 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon, then backing west late. 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 east 10 to 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...Southeast winds 10 to 20 knots backing east by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...East winds 10 to 20 knots. Waves building to 2 to 4 feet. .SATURDAY...East winds 15 to 25 knots becoming southeast 10 to 20 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet. .SUNDAY...West winds 5 to 15 knots backing southwest. Waves subsiding to calm to 2 feet. $$ LSZ267-200800- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 401 PM EDT Tue May 19 2026 .LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 20 to 30 knots. Waves 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight, then becoming west less than 10 knots late. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Waves building to 1 to 3 feet. .SATURDAY...East winds 15 to 25 knots becoming southeast 10 to 20 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SUNDAY...West winds 5 to 15 knots backing southwest. Waves calm to 2 feet. $$ LSZ261-200200- MAFOR 1921/ Superior West 11620 11720 12710 12700 11500 11410. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight. Waves 1 foot or less Wednesday. Superior North Central 13730 12720 11710 11700 11510. Waves 2 to 4 feet tonight. Waves 1 to 3 feet Wednesday. Superior South Central 11740 14730 11720 11810 11100. Waves 3 to 5 feet subsiding to 2 to 4 feet, then building to 3 to 5 feet tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet Wednesday. Superior East 14740 11730 13720. Waves 4 to 7 feet tonight. Waves 3 to 6 feet subsiding to 2 to 3 feet Wednesday. $$ 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