Sunday storms in northeastern US to usher in cooler air, frost potential

Drenching showers and thunderstorms will mark the arrival of another push of cooler air into the Northeast on Sunday, and forecasters cannot rule out the potential for temperatures to dip to frosty levels across the northern tier early this week.The corridor of unsettled weather first drenched the Midwest at the beginning of the weekend. By early Sunday morning, showers and thunderstorms were dampening the central Great Lakes and Ohio Valley.By Sunday afternoon, the zone of drenching showers and