Rain is expected to overspread eastern upper and far northern lower Michigan later tonight into Sunday. Some of this rain may be heavy at times, especially during any thunderstorms. Shower and thunderstorm activity should taper into Monday. More showers and storms return later Monday night and lasting through Tuesday night, with heavy rainfall once again possible. * WHAT...Flooding caused by rain and snowmelt will be possible. * WHERE...Portions of Eastern Upper and Northern Lower Michigan, in