Great Lakes Forecast
Issued by NWS
Issued by NWS
513 FZUS63 KMQT 200746 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 346 AM EDT Thu Jun 20 2024 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...High pressure of 30.3 inches centered over northern Minnesota will build to 30.4 inches as it shifts east, settling over Lake Superior for Thursday and Thursday night. On Friday, 30.3 inch high pressure ridging will extend from Maine to Lake Superior while 29.7 inch low pressure develops over eastern Colorado. This low will track northeast to northern Wisconsin on Saturday as the high pressure ridge drifts northeast. The low will then deepen to 29.4 inches as it tracks across Upper Michigan and southeast Lake Superior during Saturday night and reaches southern Quebec by Sunday evening. In its wake, 29.9 inch high pressure building into the Northern Plains on Sunday will settle over the western Great Lakes region on Monday. LSZ162-201600- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 346 AM EDT Thu Jun 20 2024 /246 AM CDT Thu Jun 20 2024/ .EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. A slight chance of showers through early afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A slight chance of showers. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves building to 1 to 3 feet. .SATURDAY...Northeast winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .SATURDAY NIGHT...Northeast winds 10 to 20 knots backing west after midnight. A chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ263-201600- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 346 AM EDT Thu Jun 20 2024 .EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Northeast winds 5 to 15 knots veering east late. A slight chance of showers. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots diminishing to less than 10 knots late. A slight chance of showers after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots backing northeast in the afternoon. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots backing northeast by mid afternoon. Showers. Waves building to 2 to 4 feet. .SATURDAY NIGHT...Northeast winds 5 to 15 knots backing northwest after midnight. A chance of showers. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of showers. Waves subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots becoming south 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ264-201600- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 346 AM EDT Thu Jun 20 2024 .EARLY THIS MORNING...North winds less than 10 knots. Waves calm to 2 feet. .TODAY...Northeast winds less than 10 knots veering east in the afternoon. Waves calm to 2 feet. .TONIGHT...East winds less than 10 knots. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots increasing to 5 to 15 knots in the afternoon. A slight chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers. A slight chance of thunderstorms after midnight. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots. Showers likely. Waves calm to 2 feet. .SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north after midnight. A chance of showers. Waves building to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. A chance of showers. Waves subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots becoming south 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ265-201600- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 346 AM EDT Thu Jun 20 2024 .EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Northeast winds 5 to 15 knots. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots diminishing to less than 10 knots after midnight. A slight chance of showers after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers through midnight, then showers likely and a slight chance of thunderstorms after midnight. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Showers. Waves calm to 2 feet. .SATURDAY NIGHT...Northeast winds 10 to 20 knots backing northwest after midnight. A chance of showers. Waves calm to 2 feet. .SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to 20 knots. A chance of showers. Waves calm to 2 feet. .MONDAY...West winds 10 to 20 knots backing south. A chance of showers. Waves calm to 2 feet. $$ LSZ266-201600- 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- 346 AM EDT Thu Jun 20 2024 .EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...North winds 5 to 15 knots. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .TONIGHT...North winds 5 to 15 knots. A slight chance of showers after midnight. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots veering east in the afternoon. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers. A slight chance of thunderstorms after midnight. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Showers. Waves calm to 2 feet. .SATURDAY NIGHT...East winds 10 to 20 knots backing northwest after midnight. A chance of showers. Waves building to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. Waves 1 to 3 feet. .MONDAY...West winds 5 to 15 knots becoming south 10 to 20 knots. A chance of showers. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. $$ LSZ267-201600- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 346 AM EDT Thu Jun 20 2024 .EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...North winds 5 to 15 knots. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .TONIGHT...North winds 5 to 15 knots backing northwest after midnight, then veering north late. A slight chance of showers. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 5 to 15 knots veering east after midnight. A chance of showers. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots. Showers likely through early afternoon, then showers by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...East winds 10 to 20 knots backing northwest after midnight. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves building to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. Waves 1 to 3 feet. .MONDAY...West winds 10 to 20 knots backing south. A chance of showers. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. $$ LSZ261-201600- MAFOR 2009/ Superior West 13100 13110 12100. Waves 1 foot or less. Superior North Central 11800 11100 12200 11300 11100 12200. Waves 2 feet or less. Superior South Central 11800 15100 11100. Waves 1 foot or less. Superior East 14800 12810 12800. Waves 1 to 2 feet. $$ 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