A broken line of thunderstorms developed this evening from northeastern Upper Michigan west-southwestward into the western U.P. The heaviest thunderstorm developed on the northeast end of the line where three-quarter inch hail was observed at Grand Marais. This storm prompted the National Weather Service in Marquette to issue a Severe Thunderstorm Warning for portions of Alger into Luce County. The warning has since expired.
Scattered showers and thunderstorms will likely persist into the night as a cool front slowly sinks into Upper Michigan from the northwest. This slow-moving front means that the chance of showers and thunderstorms will continue at least for southern and eastern Upper Michigan into Wednesday.
Behind the front, cooler, drier air will filter into the U.P. starting Wednesday. Genuine "U.P. Summer Weather" will then continue into the beginning of the weekend as high pressure builds in from the northwest and settles over the Great Lakes.