Boom! A loud rumble barreled across the Philadelphia region this morning.
Tweets with the word "shook" skyrocketed moments after a loud thunder clap was heard about 10:20 a.m. Was it an earthquake? No, the loud boom heard was thunder.
NBC10 chief meteorologist Glenn "Hurricane" Schwartz says it was caused by lightning that amplified due to the cold air.
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Rain moved into the area at the end of the morning commute. The thunderstorm is passing by the area and should be gone by 1 p.m. It made itself known knocking out power in parts of Delaware County and Roxborough.