Great Lakes Forecast
Issued by NWS
Issued by NWS
919 FZUS63 KMQT 010756 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 356 AM EDT Mon Jul 1 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 sprawling 30.3 inch high pressure is currently over the western Great Lakes region. As the high weakens to 30.2 inches while moving to the Lower Great Lakes this evening, a 29.6 inch low will develop over the Northern Plains. This low will deepen to 29.4 inches while lifting into northern Ontario by Tuesday evening. An associated 29.7 inch trough will sweep across Lake Superior Tuesday night and Wednesday morning. In its wake, a 29.9 inch high pressure ridge will shift east, reaching the western Great Lakes on Thursday. A 29.7 inch low pressure organizing over the Plains on Thursday will then track to the western Great Lakes region on Friday. LSZ162-011600- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 356 AM EDT Mon Jul 1 2024 /256 AM CDT Mon Jul 1 2024/ .EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...South winds 5 to 15 knots backing east in the afternoon, then increasing to 10 to 20 knots late. Waves calm to 2 feet. .TONIGHT...East winds 10 to 20 knots veering southeast after midnight. A slight chance of showers through midnight. A slight chance of thunderstorms. Showers after midnight. Patchy fog after midnight. Waves building to 1 to 3 feet. .TUESDAY...Southeast winds 15 to 25 knots veering south in the afternoon, then diminishing to 10 to 20 knots late. A slight chance of thunderstorms through early afternoon. A chance of showers. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .TUESDAY NIGHT...Southwest winds 10 to 20 knots veering west after midnight. A chance of showers and a slight chance of thunderstorms through midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...West winds 15 to 25 knots becoming southwest 20 to 30 knots by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots becoming northeast 10 to 20 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY...Northeast winds 10 to 20 knots backing northwest. A chance of showers. Waves calm to 2 feet. $$ LSZ263-011600- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 356 AM EDT Mon Jul 1 2024 .EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...South winds 5 to 15 knots backing east in the afternoon. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots veering south after midnight, then increasing to 15 to 25 knots late. A chance of showers. A slight chance of thunderstorms after midnight. Waves building to 2 to 4 feet. .TUESDAY...South winds 15 to 25 knots. Showers and a slight chance of thunderstorms through early afternoon, then a chance of showers by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .TUESDAY NIGHT...South winds 5 to 15 knots becoming southwest 10 to 20 knots after midnight. A chance of showers and a slight chance of thunderstorms. Waves subsiding to 1 to 3 feet. .WEDNESDAY...West winds 15 to 25 knots backing southwest by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY NIGHT...West winds 15 to 25 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .THURSDAY...Southwest winds 5 to 15 knots backing east. A chance of showers. Waves subsiding to calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots backing north. A chance of showers. Waves calm to 2 feet. $$ LSZ264-011600- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 356 AM EDT Mon Jul 1 2024 .EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Southwest winds 5 to 15 knots backing southeast late. Waves calm to 2 feet. .TONIGHT...Southeast winds 10 to 20 knots veering south after midnight. A chance of showers after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...South winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon, then diminishing to 15 to 25 knots late. Showers through early afternoon, then a chance of showers by mid afternoon. Waves building to 4 to 7 feet occasionally to 9 feet. .TUESDAY NIGHT...South winds 10 to 20 knots veering southwest after midnight. A chance of showers and a slight chance of thunderstorms. Waves subsiding to 2 to 4 feet. .WEDNESDAY...Southwest winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY NIGHT...West winds 15 to 25 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .THURSDAY...West winds 5 to 15 knots backing east. Waves subsiding to calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots backing north. A chance of showers. Waves calm to 2 feet. $$ LSZ265-011600- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 356 AM EDT Mon Jul 1 2024 .EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Southwest winds 5 to 15 knots backing southeast in the afternoon, then increasing to 10 to 20 knots late. Waves calm to 2 feet. .TONIGHT...Southeast winds 10 to 20 knots veering south after midnight, then backing southeast late. A chance of showers after midnight. Waves building to 2 to 4 feet. .TUESDAY...South winds 20 to 30 knots. Showers. A slight chance of thunderstorms by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...South winds 15 to 25 knots becoming southwest 10 to 20 knots after midnight. A chance of showers and a slight chance of thunderstorms. Waves subsiding to calm to 2 feet. .WEDNESDAY...West winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet. .THURSDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots becoming northwest 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ266-011600- 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- 356 AM EDT Mon Jul 1 2024 .EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Southwest winds 5 to 15 knots backing southeast late. Waves calm to 2 feet. .TONIGHT...Southeast winds 10 to 20 knots veering south after midnight, then increasing to 15 to 25 knots late. A slight chance of showers after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...South winds 15 to 25 knots increasing to 30 knots with a few gale force gusts to 35 knots possible. Showers through early afternoon, then a chance of showers by mid afternoon. Waves building to 4 to 8 feet occasionally to 10 feet. .TUESDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Showers likely and a slight chance of thunderstorms. Waves subsiding to 2 to 4 feet. .WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to 1 to 3 feet. .THURSDAY...West winds 5 to 15 knots backing east. A chance of showers. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 5 to 15 knots becoming north 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ267-011600- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 356 AM EDT Mon Jul 1 2024 .EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...West winds 5 to 15 knots backing east late. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight, then backing southeast late. Waves calm to 2 feet. .TUESDAY...South winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon. A chance of showers through early afternoon, then showers by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Showers. A slight chance of thunderstorms after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...Southwest winds 10 to 20 knots veering west by mid afternoon. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .THURSDAY...West winds 5 to 15 knots backing east. Waves calm to 2 feet. .FRIDAY...East winds 10 to 20 knots backing northeast. A chance of showers and thunderstorms. Waves calm to 2 feet. $$ LSZ261-011600- MAFOR 0109/ Superior West 11500 11400 11300 12210 12310 11320. A chance of showers overnight. Waves 1 foot or less today. Waves 1 to 3 feet tonight. Superior North Central 11610 12500 11300 11310 11320 12420. Waves 2 feet or less today. Waves 1 to 2 feet building to 2 to 4 feet tonight. Superior South Central 11600 11500 11300 11310 12320 11420 11320. Waves 2 feet or less today. Waves 2 to 3 feet tonight. Superior East 11600 12500 11400 12310 12410. 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