Great Lakes Forecast
Issued by NWS
Issued by NWS
262 FZUS63 KMQT 122036 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 436 PM 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 northern 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. Deepening low pressure near 29.2 inches emerges out of the High Plains, moving northeast towards the Hudson Bay Sunday into Monday, extending a 29.6 inch trough over Lake Superior. LSZ162-130445- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 436 PM EDT Wed Jun 12 2024 /336 PM CDT Wed Jun 12 2024/ ...SEVERE THUNDERSTORM WATCH 405 IN EFFECT UNTIL 11 PM EDT /10 PM CDT/ THIS EVENING... .LATE THIS AFTERNOON...South winds 15 to 25 knots. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots veering west late. Showers and thunderstorms likely through midnight. Patchy fog after midnight. Some thunderstorms may be severe. Waves calm to 2 feet. .THURSDAY...West winds 15 to 25 knots. Patchy fog through early afternoon. A slight chance of showers and thunderstorms. Waves building to 1 to 3 feet. .THURSDAY NIGHT...West winds 10 to 20 knots becoming northwest 5 to 15 knots after midnight, then veering north late. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. A chance of showers through midnight, then showers likely after midnight. Waves building to 1 to 3 feet. .SUNDAY...East winds 10 to 20 knots veering west. A chance of showers and thunderstorms. Waves subsiding to calm to 2 feet. .MONDAY...East winds 10 to 20 knots backing northeast. A chance of showers. Waves calm to 2 feet. $$ LSZ263-130445- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 436 PM EDT Wed Jun 12 2024 .LATE THIS AFTERNOON...South winds 10 to 20 knots. A chance of showers and a slight chance of thunderstorms. Waves 1 to 3 feet. .TONIGHT...South winds 5 to 15 knots veering west late. Showers likely and a chance of thunderstorms through midnight, then a slight chance of showers and thunderstorms after midnight. Patchy fog after midnight. Some thunderstorms may be severe through midnight. Waves subsiding to calm to 2 feet. .THURSDAY...West winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then diminishing to 10 to 20 knots late. Patchy fog through early afternoon. A chance of showers and a slight chance of thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .THURSDAY NIGHT...West winds 5 to 15 knots veering north late. Waves subsiding to calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 10 to 20 knots. A chance of showers through midnight, then showers likely after midnight. Waves building to 1 to 3 feet. .SUNDAY...Southeast winds 10 to 20 knots becoming southwest 5 to 15 knots. A chance of showers. Waves subsiding to calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots backing south. A chance of showers. Waves calm to 2 feet. $$ LSZ264-130445- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 436 PM EDT Wed Jun 12 2024 .LATE THIS AFTERNOON...South winds 10 to 20 knots. A chance of showers and a slight chance of thunderstorms. Waves 1 to 3 feet. .TONIGHT...South winds 5 to 15 knots veering west late. A chance of showers and thunderstorms. Patchy fog after midnight. Some thunderstorms may be severe through midnight. Waves subsiding to calm to 2 feet. .THURSDAY...West winds 10 to 20 knots. Patchy dense fog through early afternoon. A slight chance of showers and thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .THURSDAY NIGHT...West winds 5 to 15 knots veering north late. 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...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 10 to 20 knots. A chance of showers. Waves building to 2 to 4 feet. .SUNDAY...Southeast winds 10 to 20 knots becoming southwest 5 to 15 knots. A chance of showers. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ265-130445- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 436 PM EDT Wed Jun 12 2024 .LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots veering southwest late. A chance of showers and thunderstorms. Waves calm to 2 feet. .THURSDAY...West winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then veering northwest late. A slight chance of thunderstorms through early afternoon. A slight chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .THURSDAY NIGHT...Northwest winds 10 to 20 knots backing west after midnight, then veering northwest late. Waves calm to 2 feet. .FRIDAY...North winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots increasing to 15 to 25 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 15 to 25 knots backing southeast after midnight. A chance of showers. Waves calm to 2 feet. .SUNDAY...Southeast winds 15 to 25 knots becoming south 10 to 20 knots. A chance of showers and thunderstorms. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .MONDAY...Southeast winds 10 to 20 knots veering south. A chance of showers. Waves calm to 2 feet. $$ LSZ266-130445- 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- 436 PM EDT Wed Jun 12 2024 .LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A chance of showers and a slight chance of thunderstorms. 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 calm to 2 feet. .THURSDAY...West winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon, then veering northwest late. A slight chance of showers and thunderstorms. Waves building to 2 to 4 feet. .THURSDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .FRIDAY...North winds 10 to 20 knots becoming northwest 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 15 to 25 knots backing southeast after midnight. 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. .MONDAY...South winds 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ267-130445- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 436 PM EDT Wed Jun 12 2024 .LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A chance of showers and a slight chance of thunderstorms. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves calm to 2 feet. .THURSDAY...Southwest winds 10 to 20 knots becoming west 15 to 25 knots in the afternoon. A chance of showers and thunderstorms. Waves building to 2 to 4 feet. .THURSDAY NIGHT...West winds 10 to 20 knots veering northwest after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 10 to 20 knots. A chance of showers after midnight. Waves building to 1 to 3 feet. .SUNDAY...Southeast winds 15 to 25 knots becoming south 10 to 20 knots. A chance of showers and thunderstorms. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .MONDAY...South winds 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ261-130445- MAFOR 1221/ Superior West...SEVERE THUNDERSTORM WATCH IN EFFECT...11410 11419 12510 14620. Waves 1 to 3 feet. Superior North Central 11420 11310 11416 11510 11610 11620 19624 11620 11730. A chance of thunderstorms tonight. Waves 1 to 3 feet. Superior South Central 11310 11419 11416 11410 11510 12620 11730. Waves 1 to 3 feet. Superior East 11310 12416 11410 12510 12620. A chance of thunderstorms tonight and Thursday morning. Waves 1 to 2 feet tonight. Waves 2 to 4 feet Thursday. $$ BW Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes