As summer kicks off, much of the East Coast — including Pennsylvania — has already endured a punishing stretch of extreme temperatures, thanks to what meteorologists are calling a "heat dome." According to ABC 27 Meteorologist Dan Tomaso, the phenomenon is a classic — but intense — example of high-pressure systems trapping heat across large regions.

Support WITF: https://www.witf.org/support/give-now/

See omnystudio.com/listener for privacy information.