I use the weather channel app for radar tracking and longer weather outlook over one hour. Its free.
Dark Sky app. for rain and storms over head. Very accurate for 1 hour will tell you when rain will start and stop. Also how far and the direction of nearest rain. It has good radar but not as user friendly to use as the weather channel app. This app cost a few bucks.
P.S. Are you going to the Edmund Fitzgerald Run?