Great Lakes Forecast
Issued by NWS
Issued by NWS
686 FZUS63 KMQT 121352 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 952 AM EDT Wed Jun 12 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 29.4 inch low pressure system over far northwestern Ontario shifts east out over James Bay by this evening, dragging a 29.6 inch trough over Lake Superior tonight through Thursday morning. 30.1 inch ridging moves into the High Plains late Thursday into Friday, becoming centered over Lake Superior on Friday afternoon. This high pressure builds to 30.2 inches and moves over the central Great Lakes Saturday, and will continue shifting east toward New England on Sunday as troughing sets up west of Lake Superior. LSZ162-122200- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 952 AM EDT Wed Jun 12 2024 /852 AM CDT Wed Jun 12 2024/ .REST OF TODAY...Southwest winds 5 to 15 knots becoming south 10 to 20 knots in the afternoon. A chance of showers and thunderstorms. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots veering west late. Showers likely through midnight. A chance of thunderstorms. A slight chance of showers after midnight. Waves building to 1 to 3 feet. .THURSDAY...West winds 15 to 25 knots. A slight chance of showers and thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .THURSDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots increasing to 15 to 25 knots. Showers likely. Waves building to 1 to 3 feet. .SUNDAY...East winds 10 to 20 knots veering west. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ263-122200- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 952 AM EDT Wed Jun 12 2024 .REST OF TODAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then backing south late. A chance of showers. A chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots veering southwest after midnight. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves building to 2 to 4 feet. .THURSDAY...West winds 15 to 25 knots. A slight chance of thunderstorms through early afternoon. A slight chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .THURSDAY NIGHT...West winds 5 to 15 knots veering north after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots. Showers likely. Waves building to 1 to 3 feet. .SUNDAY...South winds 10 to 20 knots becoming west 5 to 15 knots. A chance of showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. $$ LSZ264-122200- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 952 AM EDT Wed Jun 12 2024 .REST OF TODAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then backing south late. A chance of showers. A chance of thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots veering southwest late. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves building to 1 to 3 feet. .THURSDAY...West winds 15 to 25 knots. A slight chance of thunderstorms through early afternoon. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .THURSDAY NIGHT...West winds 5 to 15 knots veering north after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...North winds 5 to 15 knots veering south by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves building to 2 to 4 feet. .SUNDAY...South winds 10 to 20 knots becoming southwest 5 to 15 knots. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ265-122200- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 952 AM EDT Wed Jun 12 2024 .REST OF TODAY...Southwest winds 5 to 15 knots becoming south 10 to 20 knots in the afternoon. A chance of showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight, then becoming southwest 15 to 25 knots late. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves calm to 2 feet. .THURSDAY...West winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon, then veering northwest late. A slight chance of showers and thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .THURSDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .FRIDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to 25 knots. A chance of showers. Waves building to 1 to 3 feet. .SUNDAY...South winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ266-122200- 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- 952 AM EDT Wed Jun 12 2024 .REST OF TODAY...Southwest winds 5 to 15 knots backing south in the afternoon, then becoming southeast 10 to 20 knots late. A chance of showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 15 to 25 knots becoming southwest 10 to 20 knots late. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .THURSDAY...Southwest winds 15 to 25 knots becoming west 20 to 30 knots in the afternoon, then veering northwest late. A slight chance of showers and thunderstorms. Waves building to 3 to 5 feet occasionally to 7 feet. .THURSDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding to 1 to 3 feet. .FRIDAY...North winds 10 to 20 knots becoming northwest 5 to 15 knots by mid afternoon. Waves subsiding to calm to 2 feet. .FRIDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to 25 knots. A chance of showers. Waves building to 2 to 4 feet. .SUNDAY...South winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ267-122200- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 952 AM EDT Wed Jun 12 2024 .REST OF TODAY...Southwest winds 5 to 15 knots backing south in the afternoon, then becoming southeast 10 to 20 knots late. A chance of showers and thunderstorms by mid afternoon. Waves calm to 2 feet. .TONIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves building to 1 to 3 feet. .THURSDAY...Southwest winds 10 to 20 knots becoming west 15 to 25 knots in the afternoon. A chance of showers and thunderstorms. Waves building to 3 to 6 feet occasionally to 8 feet. .THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. A slight chance of showers through midnight. Waves subsiding to 1 to 3 feet. .FRIDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .FRIDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots. A chance of showers. Waves building to 2 to 4 feet. .SUNDAY...South winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ261-122200- MAFOR 1215/ Superior West 11500 12410 11429 11426 11520 11530 11630. Waves 1 to 3 feet this afternoon and tonight. Waves 2 to 4 feet Thursday morning. Superior North Central 12520 11420 12426 12520 11630. A chance of thunderstorms. Waves 1 to 3 feet this afternoon and tonight. Waves 2 to 4 feet Thursday morning. Superior South Central 13410 12426 12520 11630. A chance of thunderstorms. Waves 2 feet or less this afternoon and tonight. Waves 1 to 3 feet Thursday morning. Superior East 11410 12310 12426 11420 12520. A chance of thunderstorms. Waves 1 to 2 feet this afternoon. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 3 feet Thursday morning. $$ Thompson Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes