Great Lakes Forecast
Issued by NWS
Issued by NWS
698 FZUS63 KMQT 150745 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 345 AM EDT Sun Sep 15 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...As 30.3 inch high pressure over Maine anchors offshore of the New England Coast today through Wednesday, it will extend 30.1 inch ridging back into the Great Lakes region. Meanwhile, a 29.9 inch low pressure trough across south central Canada and the Dakotas today will drift into northern Ontario on Monday before dissipating. A 29.4 inch trough will then emerge over the western Great Plains on Tuesday. Low pressure of 29.3 inches will develop along this trough and then lift into Saskatchewan on Wednesday. On Thursday, the low will drift into northern Manitoba while 30.1 inch ridging extends from Quebec into the Great Lakes region. LSZ162-151545- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 345 AM EDT Sun Sep 15 2024 /245 AM CDT Sun Sep 15 2024/ .EARLY THIS MORNING...South winds 5 to 15 knots. Isolated showers. Waves calm to 2 feet. .TODAY...South winds 5 to 15 knots backing northeast in the afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds 5 to 15 knots veering southwest late. A chance of showers and a slight chance of thunderstorms after midnight. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing south in the afternoon, then backing east late. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 10 to 20 knots becoming south 5 to 15 knots after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ263-151545- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 345 AM EDT Sun Sep 15 2024 .EARLY THIS MORNING...South winds 5 to 15 knots. Isolated showers. Waves calm to 2 feet. .TODAY...South winds 5 to 15 knots backing southeast late. Isolated showers through early afternoon. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots veering southwest late. A slight chance of showers and thunderstorms after midnight. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .MONDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .WEDNESDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots veering south. Waves calm to 2 feet. $$ LSZ264-151545- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 345 AM EDT Sun Sep 15 2024 .EARLY THIS MORNING...South winds 5 to 15 knots. Scattered showers. Waves 1 to 3 feet subsiding to calm to 2 feet. .TODAY...South winds 5 to 15 knots backing southeast late. Isolated showers through early afternoon. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots veering southwest late. A slight chance of showers and thunderstorms after midnight. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .MONDAY NIGHT...South winds 5 to 15 knots. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .WEDNESDAY...Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet. $$ LSZ265-151545- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 345 AM EDT Sun Sep 15 2024 .EARLY THIS MORNING...South winds 5 to 15 knots. Scattered showers. Waves calm to 2 feet. .TODAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. A slight chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots veering southwest late. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY...Southwest winds 10 to 20 knots becoming southeast 5 to 15 knots late. A slight chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...South winds 5 to 15 knots. A slight chance of showers and thunderstorms through midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves calm to 2 feet. .WEDNESDAY...Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet. $$ LSZ266-151545- 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- 345 AM EDT Sun Sep 15 2024 .EARLY THIS MORNING...South winds 10 to 20 knots. Scattered showers. Waves 1 to 3 feet. .TODAY...South winds 10 to 20 knots backing southeast late. Isolated showers through early afternoon. Waves subsiding to calm to 2 feet. .TONIGHT...South winds 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .MONDAY...South winds 10 to 20 knots. A slight chance of showers. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .TUESDAY...South winds 10 to 20 knots becoming southeast 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves calm to 2 feet. .WEDNESDAY...Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots veering south. Waves calm to 2 feet. $$ LSZ267-151545- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 345 AM EDT Sun Sep 15 2024 .EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to 2 feet. .TODAY...South winds 10 to 20 knots backing southeast in the afternoon, then veering south late. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots. Waves building to 1 to 3 feet. .MONDAY...South winds 10 to 20 knots backing southeast late. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. A slight chance of showers after midnight. Waves calm to 2 feet. .TUESDAY...South winds 10 to 20 knots becoming southeast 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 10 to 20 knots. Waves calm to 2 feet. .WEDNESDAY...Southeast winds 10 to 20 knots diminishing to 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots. Waves calm to 2 feet. $$ LSZ261-151545- MAFOR 1509/ Superior West 13400 11300 11200 11310 11410 11510. Waves 2 feet or less. Superior North Central 12410 19416 12410 11310 12410 11510. Waves 1 to 3 feet. Superior South Central 11410 19416 13310 11320 11420 12410. Waves 1 to 3 feet. Superior East 13410 12310 13420. Waves 1 to 4 feet. $$ Rolfson Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes