A record-breaking heat dome is bringing dangerously high temperatures to the Eastern U.S., with cities like New York and Philadelphia experiencing triple-digit heat for the first time in over a decade. The early-season heat wave is particularly concerning as people haven't acclimated to the extreme conditions. The high-pressure system is trapping hot air from the Southwest, creating a 'near historic' event. Millions are affected, with heat-related illnesses a significant concern. Climate change is exacerbating the situation, making such heat waves three times more likely.

Prepared by Olivia Bennett and reviewed by editorial team.