Several clusters of severe thunderstorms rolled through Upper Michigan late this afternoon and evening causing power outages, down trees and at least one report of a damaged outbuilding.
The National Weather Service (NWS) stated that early this evening that a roof was blown off a shed and numerous power poles were reported down at Lâ??Anse. To the east, thunderstorm wind gusts knocked down trees that blocked Luce County road 407 west of Muskallonge State Park. To the south, penny to nickel-sized hail was reported southwest of Manistique. Then later in the evening, a new line of thunderstorms plowed into the Copper Country. Wind gusts were estimated at over 60 mph at Kearsarge in Houghton County with trees and power lines reported down throughout the Keweenaw.
The thunderstorms developed in the hot, humid air mass that has lingered over Upper Michigan since the beginning of the week. A frontal system stalled in the vicinity and as disturbances moved west to east along the front, clusters of thunderstorms formed and moved quickly eastward.
More thunderstorms are likely through the night. Then the main cold front will sweep through Upper Michigan Friday. This will end the thunderstorm threat and bring a significant cool down for the weekend.