The storm left trees and roads in several mid-Atlantic states coated in ice before warmer temperatures moved in.
The National Weather Service issued an ice storm warning​ for parts of the area and winter weather advisories for other areas in western Pennsylvania.
Did you hear thunder overnight? Here's how it happened, as explained by WTOL 11 Meteorologist John Burchfield.
Lightning strikes the U.S about 25 million times per year with most of the strikes occurring during the summer months.
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