Great Lakes Forecast
Issued by NWS
Issued by NWS
757 FZUS63 KMQT 311351 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 951 AM EDT Fri May 31 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...A 30.2 inch high pressure system will gradually drift east across the Great Lakes Basin today. Low pressure averaging 29.6 inches will move from northern Manitoba into northern Quebec over the weekend. A 29.5 inch low pressure will move from the Upper Midwest into Ontario Sunday night and Monday, which will push a cold front across Lake Superior. Weak ridging at 29.8 inches follows over the Upper Great Lakes Tuesday as a 29.2 inch low develops over southern Manitoba. This system will pull a 29.5 inch trough through Lake Superior Tuesday night into Wednesday. LSZ162-312200- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 951 AM EDT Fri May 31 2024 /851 AM CDT Fri May 31 2024/ .REST OF TODAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then backing south late. A slight chance of thunderstorms by late morning. A chance of showers. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots backing south late. A chance of rain showers and a slight chance of thunderstorms. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots becoming southwest 10 to 20 knots in the afternoon. A slight chance of rain showers. Waves calm to 2 feet. .SATURDAY NIGHT...Southwest winds 10 to 20 knots becoming west 5 to 15 knots after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...East winds 10 to 20 knots veering southeast after midnight. A chance of showers through midnight. A chance of thunderstorms. Showers after midnight. Waves building to 1 to 3 feet. .MONDAY...Southwest winds 15 to 25 knots becoming northwest 5 to 15 knots. A chance of showers and thunderstorms. Waves subsiding to calm to 2 feet. .TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. A chance of thunderstorms. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ263-312200- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 951 AM EDT Fri May 31 2024 .REST OF TODAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves 1 to 3 feet subsiding to calm to 2 feet, then building to 1 to 3 feet. .TONIGHT...Southwest winds 5 to 15 knots backing south late. A chance of rain showers and a slight chance of thunderstorms. Waves subsiding to calm to 2 feet. .SATURDAY...South winds 5 to 15 knots veering southwest late. A slight chance of thunderstorms through early afternoon. A chance of rain showers. Waves calm to 2 feet. .SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A chance of showers and thunderstorms. Waves building to 1 to 3 feet. .MONDAY...South winds 10 to 20 knots becoming west 5 to 15 knots. A chance of showers and thunderstorms. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .TUESDAY...Northeast winds 5 to 15 knots veering east. A chance of showers. Waves calm to 2 feet. $$ LSZ264-312200- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 951 AM EDT Fri May 31 2024 .REST OF TODAY...Southwest 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 showers. Waves 1 to 3 feet. .TONIGHT...Southwest winds 5 to 15 knots. A chance of rain showers. A slight chance of thunderstorms after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...South winds 5 to 15 knots. Rain showers likely through early afternoon, then a slight chance of rain showers by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves building to 1 to 3 feet. .MONDAY...South winds 15 to 25 knots becoming west 5 to 15 knots. Showers and a chance of thunderstorms. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to 2 feet. .TUESDAY...East winds 5 to 15 knots veering southeast. A chance of showers. Waves calm to 2 feet. $$ LSZ265-312200- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 951 AM EDT Fri May 31 2024 .REST OF TODAY...South winds 10 to 20 knots becoming southeast 5 to 15 knots late. A chance of showers by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A slight chance of showers through midnight. A slight chance of thunderstorms. Showers likely after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 10 to 20 knots veering south late. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 5 to 15 knots veering southwest after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to 2 feet. .MONDAY...South winds 15 to 25 knots becoming west 10 to 20 knots. Showers. A chance of thunderstorms. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .TUESDAY...East winds 10 to 20 knots becoming southeast 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ266-312200- 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- 951 AM EDT Fri May 31 2024 .REST OF TODAY...South winds 15 to 25 knots diminishing to 10 to 20 knots in the afternoon. A slight chance of showers by mid afternoon. Waves 1 to 3 feet subsiding to calm to 2 feet. .TONIGHT...South winds 10 to 20 knots. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .SATURDAY...South winds 10 to 20 knots. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 5 to 15 knots veering southwest after midnight. A chance of rain showers and a slight chance of thunderstorms through midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. Waves building to 1 to 3 feet. .MONDAY...South winds 15 to 25 knots becoming west 10 to 20 knots. Showers. A chance of thunderstorms. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to 2 feet. .TUESDAY...East winds 10 to 20 knots becoming southeast 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ267-312200- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 951 AM EDT Fri May 31 2024 .REST OF TODAY...South winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots. Waves calm to 2 feet. .SATURDAY...South winds 10 to 20 knots. A slight chance of showers. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. A chance of showers and a slight chance of thunderstorms through midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet. .MONDAY...Southeast winds 15 to 25 knots becoming south 10 to 20 knots. Showers likely. A chance of thunderstorms. A chance of showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .TUESDAY...South winds 10 to 20 knots backing southeast. Waves calm to 2 feet. $$ LSZ261-312200- MAFOR 3115/ Superior West 12520 11420 11410 11510 11500 12400. A chance of showers this afternoon, overnight, and Saturday morning. Waves 1 to 2 feet. Superior North Central 13520 12410 11510 11516 11406. Waves 1 to 3 feet this afternoon and tonight. Waves 2 feet or less Saturday morning. Superior South Central 11420 11310 11210 11300 13400 11300. A chance of showers overnight and Saturday morning. Waves 2 feet or less. Superior East 12420 15410. Waves 1 to 3 feet. $$ LC Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes