Great Lakes Forecast
Issued by NWS
Issued by NWS
815 FZUS63 KMQT 070755 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 355 AM EDT Sun Jul 7 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 a 30.0 inch high pressure ridge over the Great Lakes drifts east today, a 29.9 inch low pressure trough will slowly move east across Minnesota. This trough will dissipate as it moves over Lake Superior on Monday. Then a weak high pressure of 29.9 inches setting up over Lake Superior on Tuesday will build to 30.1 inches on Wednesday. On Thursday, 30.1 inch ridging will extend from central Quebec across Lake Superior into the Upper Mississippi Valley. LSZ162-071600- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 355 AM EDT Sun Jul 7 2024 /255 AM CDT Sun Jul 7 2024/ .EARLY THIS MORNING...East winds 5 to 15 knots. Isolated showers and thunderstorms. Waves calm to 2 feet. .TODAY...East winds 5 to 15 knots backing northeast in the afternoon, then becoming east 10 to 20 knots late. Scattered showers and thunderstorms. Waves calm to 2 feet. .TONIGHT...Northeast winds 5 to 15 knots veering east late. A slight chance of showers and thunderstorms through midnight. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots. A slight chance of showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots. A slight chance of showers and thunderstorms through midnight. Waves calm to 2 feet. .TUESDAY...West winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...West winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .WEDNESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots veering southwest. Waves calm to 2 feet. $$ LSZ263-071600- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 355 AM EDT Sun Jul 7 2024 .EARLY THIS MORNING...South winds less than 10 knots. Waves calm to 2 feet. .TODAY...South winds less than 10 knots becoming east 5 to 15 knots in the afternoon. Scattered showers and thunderstorms. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots veering south after midnight, then becoming southwest less than 10 knots late. A slight chance of showers and thunderstorms through midnight. Waves calm to 2 feet. .MONDAY...Southwest winds less than 10 knots becoming west 5 to 15 knots in the afternoon, then backing southwest late. A slight chance of showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southwest winds 5 to 15 knots becoming west less than 10 knots after midnight. A slight chance of showers and thunderstorms through midnight. Waves calm to 2 feet. .TUESDAY...West winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southwest winds less than 10 knots veering north after midnight. Waves calm to 2 feet. .WEDNESDAY...Northeast winds 5 to 15 knots diminishing to less than 10 knots. Waves calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ264-071600- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 355 AM EDT Sun Jul 7 2024 .EARLY THIS MORNING...South winds less than 10 knots. Waves calm to 2 feet. .TODAY...Southeast winds less than 10 knots increasing to 5 to 15 knots in the afternoon. Isolated showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots veering south after midnight. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .MONDAY...Southwest winds less than 10 knots increasing to 5 to 15 knots in the afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southwest winds 5 to 15 knots becoming west less than 10 knots after midnight. A slight chance of showers. Waves calm to 2 feet. .TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY NIGHT...Southwest winds less than 10 knots veering west after midnight. Waves calm to 2 feet. .WEDNESDAY...Northeast winds 5 to 15 knots becoming north less than 10 knots. Waves calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ265-071600- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 355 AM EDT Sun Jul 7 2024 .EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then backing east late. Isolated showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots. A chance of showers and thunderstorms. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing east in the afternoon. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots veering west after midnight. A slight chance of thunderstorms through midnight. A slight chance of showers. Waves calm to 2 feet. .TUESDAY...North winds 5 to 15 knots veering northeast by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...South winds 5 to 15 knots backing north after midnight. Waves calm to 2 feet. .WEDNESDAY...Northeast winds 5 to 15 knots backing northwest. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots veering south. Waves calm to 2 feet. $$ LSZ266-071600- 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- 355 AM EDT Sun Jul 7 2024 .EARLY THIS MORNING...South winds 5 to 15 knots. Patchy fog. Waves calm to 2 feet. .TODAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots late. Patchy fog through early afternoon. Isolated showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots diminishing to 5 to 15 knots late. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots veering southwest in the afternoon, then backing east late. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .TUESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .WEDNESDAY...North winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots veering south. Waves calm to 2 feet. $$ LSZ267-071600- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 355 AM EDT Sun Jul 7 2024 .EARLY THIS MORNING...Southeast winds 5 to 15 knots. Patchy fog. Waves calm to 2 feet. .TODAY...Southeast winds 5 to 15 knots backing east in the afternoon, then becoming southeast 10 to 20 knots late. Isolated showers by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots. A chance of showers. A slight chance of thunderstorms after midnight. Waves calm to 2 feet. .MONDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon, then backing east late. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .MONDAY NIGHT...South winds 5 to 15 knots veering northwest after midnight. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .TUESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .WEDNESDAY...North winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots backing southwest. Waves calm to 2 feet. $$ LSZ261-071600- MAFOR 0709/ Superior West 12300 11200 11100 19109 11200 19209 11210 11200 11300. Waves 1 foot or less. Superior North Central 11400 13300 12310 11410 11400. Waves 2 feet or less. Superior South Central 12410 11300 13310 12410. A chance of showers and thunderstorms tonight. Waves 2 feet or less. Superior East 14300 11310 13410. Waves 2 feet or less. $$ Rolfson Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes