Violent storms pelted the area with rain and golf ball-sized hail Thursday night, leaving more than 100,000 ComEd customers without power.

The "supercell" storm hit shortly after 9 p.m. The south suburbs had about 56,000 ComEd customers without electricity. About 16,000 customers did not have power in Chicago and near west suburbs.

The severe storm collapsed part of the roof at the conference center at Illinios Beach State Park and felled trees and snapped utility poles, knocking out power in Waukegan, Beach Park, Zion and Winthrop Harbor and as far north as Racine.