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Great Lakes Forecast
Issued by NWS
Issued by NWS
941 FZUS63 KMQT 230755 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 355 AM EDT Sun Jun 23 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 29.5 inch low pressure near the Mackinac Straits early this morning will continue east-northeast into Quebec this afternoon while strengthening to 29.3 inches. Meanwhile, 29.8 inch ridging builds into the Upper Great Lakes from the west today. The high pressure ridge will then shift southeast into the Appalachians Tuesday while building to 30.0 inches. Monday night, a 29.2 inch low will track east through Manitoba, spinning across northern Ontario into James Bay Tuesday. This low will enable a 29.5 inch trough to sweep across Lake Superior Tuesday. 29.9 inch high pressure from the High Plains then extends into the Upper Great Lakes Wednesday. This high builds to 30.0 inches on Thursday morning. LSZ162-231600- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 355 AM EDT Sun Jun 23 2024 /255 AM CDT Sun Jun 23 2024/ .EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...West winds 5 to 15 knots backing southwest in the afternoon. A slight chance of showers. A slight chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots backing southwest after midnight. Patchy fog after midnight. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots veering southwest in the afternoon, then backing east late. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southwest after midnight. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves calm to 2 feet. .TUESDAY...West winds 10 to 20 knots increasing to 20 to 30 knots by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...West winds 10 to 20 knots veering northwest after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ263-231600- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 355 AM EDT Sun Jun 23 2024 .EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to 2 feet. .TODAY...West winds 5 to 15 knots. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .TONIGHT...West winds 5 to 15 knots backing southwest after midnight. Patchy fog after midnight. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing southeast late. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves building to 1 to 3 feet. .TUESDAY...West winds 15 to 25 knots backing southwest by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .WEDNESDAY...North winds 5 to 15 knots backing southwest. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ264-231600- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 355 AM EDT Sun Jun 23 2024 .EARLY THIS MORNING...Northwest winds 5 to 15 knots. A slight chance of showers. Waves calm to 2 feet. .TODAY...West winds 5 to 15 knots. A chance of showers. Waves building to 1 to 3 feet. .TONIGHT...West winds 5 to 15 knots backing southwest late. Waves subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing southeast late. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves building to 2 to 4 feet. .TUESDAY...Southwest winds 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. .TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest 10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet. .WEDNESDAY...North winds 5 to 15 knots backing west. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ265-231600- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 355 AM EDT Sun Jun 23 2024 .EARLY THIS MORNING...Northwest winds 10 to 20 knots. Patchy fog. A slight chance of showers. Waves 1 to 3 feet. .TODAY...West winds 10 to 20 knots. A slight chance of showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing southeast in the afternoon, then increasing to 10 to 20 knots late. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots. A slight chance of showers through midnight, then showers likely and a chance of thunderstorms after midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .TUESDAY...West winds 15 to 25 knots. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest 10 to 20 knots after midnight. Waves subsiding to calm to 2 feet. .WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ266-231600- 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 Jun 23 2024 .EARLY THIS MORNING...North winds 10 to 20 knots. Patchy fog. A chance of showers. Waves 2 to 4 feet. .TODAY...Northwest 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 subsiding to 1 to 3 feet, then building to 2 to 4 feet. .TONIGHT...West winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...West winds 5 to 15 knots backing south in the afternoon, then backing southeast late. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots increasing to 15 to 25 knots after midnight. A slight chance of showers through midnight, then showers likely and a chance of thunderstorms after midnight. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .TUESDAY...Southwest winds 15 to 25 knots veering west by mid afternoon. A chance of showers and thunderstorms through early afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY NIGHT...West winds 10 to 20 knots veering northwest after midnight. Waves subsiding to 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. .THURSDAY...Southwest winds 5 to 15 knots becoming southeast 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ267-231600- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 355 AM EDT Sun Jun 23 2024 .EARLY THIS MORNING...North winds 15 to 25 knots. Patchy fog. A chance of showers. Waves 2 to 4 feet. .TODAY...North winds 10 to 20 knots backing northwest in the afternoon. A chance of showers. A slight chance of thunderstorms by mid afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .TONIGHT...West winds 10 to 20 knots. A slight chance of showers and thunderstorms through midnight. Waves subsiding to calm to 2 feet. .MONDAY...West winds 5 to 15 knots backing southwest in the afternoon, then backing east late. Waves calm to 2 feet. .MONDAY NIGHT...South winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Showers likely and a slight chance of thunderstorms after midnight. Waves building to 2 to 4 feet. .TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to 20 knots by mid afternoon. A chance of showers and thunderstorms. Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. .TUESDAY NIGHT...West winds 10 to 20 knots veering northwest after midnight. Waves 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. .THURSDAY...West winds 5 to 15 knots becoming southeast 10 to 20 knots. Waves calm to 2 feet. $$ LSZ261-231600- MAFOR 2309/ Superior West 13610 13600 12500. Waves 2 feet or less. Superior North Central 11710 13620 14610. A chance of showers this afternoon. Waves 1 to 3 feet. Superior South Central 12720 12620 12610 12600. A chance of showers early this morning. Waves 1 to 3 feet building to 2 to 4 feet today. Waves 1 to 3 feet tonight. Superior East 11820 14710 11710 11600 11610. A chance of showers early this morning. A chance of showers this afternoon. A chance of showers this evening. Waves 2 to 4 feet. $$ Voss Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes