Hail was falling across Pennsylvania, with some as big as the size of golf balls.
Users on social media were posting images of the hail.
One user said that hail was smashing car windows in Wyomissing, Pa.
The hail storm is part of a larger system bringing severe weather across the East Coast, including tornadoes.
Jet lands with cracked windshield after hailstorm
PHILADELPHIA (AP) — A jetliner that flew through a hailstorm on its descent into Philadelphia landed with a cracked windshield.
US Airways says only one layer of the multilayered windshield was cracked and Flight 768 en route from Orlando, Florida, landed safely. No one was injured.
The airline says the windshield damage was possibly caused by the hail but an investigation is incomplete. The Airbus 320 is out of service while being inspected for other possible hail damage.
US Airways spokeswoman Andrea Huguely says the pilot declared an emergency as a precaution to assure “expeditious routing” into Philadelphia International Airport.
The National Weather Service says trained spotters reported up to tennis ball-size hail in an area of eastern Pennsylvania Thursday afternoon.
The hail broke windows in buildings, damaged siding and shattered car windshields.