A wild thunderstorm roared through the Philadelphia region Monday evening, leaving thousands without power and prompting a brief tornado warning in Burlington County.

A 14-year-old boy was struck by lightning in Glenolden, Delaware County, according to a preliminary report by emergency services. The boy was reportedly conscious and taken to Crozer-Chester Medical Center.

A ground stop was put into place at Philadelphia International Airport as the storm passed. It was lifted around 8:30 p.m.

The sky was lit up with intimidating displays of lightning and sporadic flooding was reported.

The National Weather Service issued a flash-flood warning until 12:15 a.m. for Philadelphia and areas stretching into central New Jersey.

Peco reported that more than 10,000 customers in Philadelphia had lost power. Substantially fewer outages were reported in the city's Pennsylvania suburbs.

About 12,000 PSE&G customers were without power in South Jersey.