Great Lakes Forecast
Issued by NWS
Issued by NWS
579 FZUS63 KMQT 310159 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 959 PM EDT Thu May 30 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 tonight into Friday. 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 Monday, which will push a cold front across Lake Superior. Week ridging at 29.8 inches follows over the Upper Great Lakes Tuesday as a 29.2 inch low develops over southern Manitoba. LSZ162-311000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 959 PM EDT Thu May 30 2024 /859 PM CDT Thu May 30 2024/ .REST OF TONIGHT...Northeast winds 10 to 20 knots veering south after midnight. A chance of rain showers and a slight chance of thunderstorms after midnight. Waves calm to 2 feet. .FRIDAY...Southwest winds 10 to 20 knots backing south late. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .FRIDAY NIGHT...Southwest winds 10 to 20 knots diminishing to 5 to 15 knots late. A chance of showers through midnight. A slight chance of thunderstorms. Showers likely after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. A chance of showers. Waves calm to 2 feet. .SATURDAY NIGHT...West winds 10 to 20 knots diminishing to 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. Showers and a chance of thunderstorms. Waves building to 1 to 3 feet. .MONDAY...West 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 and thunderstorms. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ263-311000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 959 PM EDT Thu May 30 2024 .REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight. A chance of showers after midnight. Waves calm to 2 feet building to 1 to 3 feet. .FRIDAY...Southwest winds 10 to 20 knots. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .FRIDAY NIGHT...Southwest winds 5 to 15 knots backing south late. A chance of showers through midnight. A slight chance of thunderstorms. Showers likely after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots. A slight chance of thunderstorms through early afternoon. A chance of showers. Waves building to 1 to 3 feet. .SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves building to 1 to 3 feet. .MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots. Showers likely and a chance of thunderstorms. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .TUESDAY...Northeast winds 5 to 15 knots veering east. A chance of showers. Waves calm to 2 feet. $$ LSZ264-311000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 959 PM EDT Thu May 30 2024 .REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight, then diminishing to 5 to 15 knots late. Waves 1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to 3 feet. .FRIDAY...South winds 5 to 15 knots becoming southwest 10 to 20 knots in the afternoon, then diminishing to 5 to 15 knots late. A slight chance of showers. Waves 1 to 3 feet. .FRIDAY NIGHT...South winds 5 to 15 knots. A chance of showers through midnight, then showers likely and a slight chance of thunderstorms after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...South winds 5 to 15 knots veering southwest by mid afternoon. A chance of 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 south by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Showers likely and a chance of thunderstorms after midnight. Waves building to 1 to 3 feet. .MONDAY...South winds 10 to 20 knots becoming west 5 to 15 knots. A chance of thunderstorms. A chance of showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .TUESDAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ265-311000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 959 PM EDT Thu May 30 2024 .REST OF TONIGHT...South winds 10 to 20 knots. Waves 2 to 4 feet subsiding to calm to 2 feet. .FRIDAY...South winds 10 to 20 knots. A slight chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to 15 knots after midnight, then increasing to 10 to 20 knots late. A chance of showers through midnight, then showers likely and a slight chance of thunderstorms after midnight. Waves calm to 2 feet. .SATURDAY...South winds 10 to 20 knots. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 10 to 20 knots. A chance of thunderstorms. Showers likely after midnight. Waves calm to 2 feet. .MONDAY...South winds 15 to 25 knots becoming west 10 to 20 knots. Showers. A chance of thunderstorms. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TUESDAY...East winds 10 to 20 knots veering southeast. A chance of showers. Waves calm to 2 feet. $$ LSZ266-311000- 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- 959 PM EDT Thu May 30 2024 .REST OF TONIGHT...South winds 10 to 20 knots. Waves 1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to 3 feet. .FRIDAY...South winds 10 to 20 knots. A slight chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 10 to 20 knots. A chance of showers. A slight chance of thunderstorms after midnight. Waves calm to 2 feet. .SATURDAY...South winds 10 to 20 knots. A chance of showers. A slight chance of thunderstorms by mid afternoon. 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 backing southeast by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 10 to 20 knots becoming south 15 to 25 knots after midnight. A chance of showers. A chance of thunderstorms 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. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .TUESDAY...North winds 10 to 20 knots veering southeast. A chance of showers. Waves calm to 2 feet. $$ LSZ267-311000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 959 PM EDT Thu May 30 2024 .REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight. Waves calm to 2 feet building to 1 to 3 feet. .FRIDAY...South winds 10 to 20 knots. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 10 to 20 knots. A chance of showers after midnight. Waves calm to 2 feet. .SATURDAY...South winds 10 to 20 knots. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 10 to 20 knots becoming southwest 5 to 15 knots after midnight. Waves calm to 2 feet. .SUNDAY...West winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A chance of showers after midnight. Waves calm to 2 feet. .MONDAY...South winds 15 to 25 knots becoming west 10 to 20 knots. Showers. A chance of thunderstorms. A chance of showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .TUESDAY...Northwest winds 10 to 20 knots backing southeast. A chance of showers. Waves calm to 2 feet. $$ LSZ261-311000- MAFOR 3103/ Superior West 11410 11420 11410 13510 11410 11510. A chance of showers overnight, Friday morning, and Friday evening. Waves 1 to 2 feet. Superior North Central 13420 11410 12520 12410. A chance of showers Friday morning and Friday evening. Waves 1 to 3 feet. Superior South Central 11420 14410 12310 11400. Waves 2 to 4 feet subsiding to 1 to 3 feet overnight through Friday evening. Superior East 12410 12510 14410. Waves 1 to 3 feet. $$ JSS Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes