Friday’s first round of the Keystone State Shootout on Zimmer's United Late Model Series at Thunder Mountain Speedway in Knox Dale, Pa., was rained out and rescheduled for May 18. The ULMS weekend now launches Saturday at Port Royal (Pa.) Speedway with Sunday’s event scheduled for Tri-City Raceway Park in Franklin, Pa.

The weekend’s other weather-related schedule changes:

• Wet grounds and cold temperatures also postponed Sunday's ULMS event at Tri-City; a makeup date was planned but wasn't immediately announced.

• Wet grounds halted Friday’s Mississippi State Championship Challenge Series event at Greenville (Miss.) Speedway; MSCCS competitors chase a $2,500 winner’s purse Saturday at Greenville.