If outdoors, consider seeking shelter inside a building.

At 657 PM EDT, Doppler radar was tracking a strong thunderstorm 6 miles south of Rockford, or 8 miles northeast of Grand Rapids, moving east at 25 mph. HAZARD...Winds in excess of 40 mph and penny size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Grand Rapids... Ionia... Greenville... Portland... Stanton... Kentwood... Walker... East Grand Rapids... Belding... Rockford... Coopersville... Sparta... Lowell... Saranac... Ravenna... Carson City... Allendale... Ada... Grattan... Cedar Springs...