Record-setting heat wave headed to central, Midwest and eastern U.S.

The first day of summer brings a dangerous heat wave across the U.S.

A heat dome is forming, leading to heat advisories in many central and eastern states, with temperatures expected to exceed 90°F, reaching triple digits in some areas. Health experts advise limiting outdoor activities and staying hydrated, as cities implement cooling centers and other resources to help residents cope with the extreme heat.