FZUS63 KMQT 210801 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 400 AM EDT Sun Jun 21 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... This morning, the Upper Great Lakes are under broad weak 29.9 inch ridging associated with 30.1 inch high pressure over northwest Canada. As a 29.8 inch low passes south of the Great Lakes through Monday morning, high pressure builds to 30.2 inches over northern Manitoba. The high then moves over Hudson Bay, northern Ontario, and Lake Superior for Tuesday, maintaining 30.2 inches. Tuesday afternoon, a weak 30.0 inch low forms over the Dakotas, deepening toi 29.9 inches over Wisconsin Wednesday as the high retreats to Hudson Bay. The low continues slowly pushing east through the Great Lakes Thursday before broad 30.0 inch high pressure fills in over the Upper Great Lakes for Friday. LSZ162-212000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 400 AM EDT Sun Jun 21 2026 /300 AM CDT Sun Jun 21 2026/ .EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Northeast winds 5 to 15 knots veering southeast in the afternoon, then backing east late. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots backing northeast after midnight. Waves calm to 2 feet. .MONDAY...North winds less than 10 knots becoming southwest 5 to 15 knots in the afternoon, then veering north late. Waves calm to 2 feet. .MONDAY NIGHT...North winds 5 to 15 knots diminishing to less than 10 knots after midnight. Waves calm to 2 feet. .TUESDAY...North winds 5 to 15 knots veering northeast by mid afternoon. A chance of rain showers by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Northeast winds 5 to 15 knots. A chance of rain showers through midnight. Rain showers likely after midnight. Waves calm to 2 feet. .WEDNESDAY...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. .THURSDAY...North winds 5 to 15 knots diminishing to less than 10 knots. Waves calm to 2 feet. $$ LSZ263-212000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 400 AM EDT Sun Jun 21 2026 .EARLY THIS MORNING...North winds less than 10 knots. Waves calm to 2 feet. .TODAY...North winds less than 10 knots veering northeast in the afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds less than 10 knots becoming north 5 to 15 knots late. Waves calm to 2 feet. .MONDAY...North winds 5 to 15 knots backing west in the afternoon. Waves calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots diminishing to less than 10 knots after midnight. Waves calm to 2 feet. .TUESDAY...Southwest winds less than 10 knots becoming northeast 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...East winds 5 to 15 knots. A chance of rain showers through midnight. Rain showers likely after midnight. Waves calm to 2 feet. .WEDNESDAY...Northeast winds 5 to 15 knots. A chance of rain showers. Waves calm to 2 feet. .THURSDAY...North winds less than 10 knots backing west. Waves calm to 2 feet. $$ LSZ264-212000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 400 AM EDT Sun Jun 21 2026 .EARLY THIS MORNING...Northwest winds less than 10 knots. Waves calm to 2 feet. .TODAY...North winds less than 10 knots veering northeast late. Waves calm to 2 feet. .TONIGHT...West winds lessthan 10 knots becoming northwest 5 to 15 knots after midnight. Waves calm to 2 feet. .MONDAY...Northwest winds 5 to 15 knots backing west late. Waves calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY...West winds less than 10 knots backing southwest by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds less than 10 knots becoming east 5 to 15 knots after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots backing northeast. A chance of rain showers. Waves calm to 2 feet. .THURSDAY...North winds less than 10 knots backing west. Waves calm to 2 feet. $$ LSZ265-212000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 400 AM EDT Sun Jun 21 2026 .EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...East winds 5 to 15 knots backing northeast in the afternoon, then veering east late. Waves calm to 2 feet. .TONIGHT...Northeast winds 5 to 15 knots backing northwest after midnight. Waves calm to 2 feet. .MONDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY...Northwest winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots. A chance of showers after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots backing north. A chance of showers. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots backing west. Waves calm to 2 feet. $$ LSZ266-212000- 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- 400 AM EDT Sun Jun 21 2026 .EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots veering northeast late. Waves calm to 2 feet. .TONIGHT...North winds 5 to 15 knots backing northwest after midnight. Waves calm to 2 feet. .MONDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots backing northwest. Waves calm to 2 feet. $$ LSZ267-212000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 400 AM EDT Sun Jun 21 2026 .EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...West winds 5 to 15 knots veering north in the afternoon. Waves calm to 2 feet. .TONIGHT...North winds 5 to 15 knots backing northwest after midnight. Waves calm to 2 feet. .MONDAY...Northwest winds 10 to 20 knots backing west late. Waves calm to 2 feet. .MONDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves calm to 2 feet. .TUESDAY...Northwest winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...North winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves calm to 2 feet. $$ LSZ261-211400- MAFOR 2109/ Superior West 11800 11100 14200 12100. Waves 1 foot or less. Superior North Central 12700 11800 11500 14700. Waves 1 foot or less. Superior South Central 11700 11600 12100 11200 11100 11800 11700. Waves 1 foot or less. Superior East 12600 11700 12800 13700. Waves 1 foot or less. $$ 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