Widespread Heatwave Affects Multiple US Regions with Dangerous Heat Index Values

A widespread heatwave is impacting several regions across the United States. An Extreme Heat Warning is in effect for the Apple and Lucerne Valleys in California until Sunday, with significantly increased risk of heat-related illnesses. A Heat Advisory is also in effect for eastern Oklahoma and west central Arkansas, with heat index values up to 107 degrees expected. The Philadelphia region is experiencing its sixth heat wave of the summer, with high temperatures in the low 90s and heat index values frequently reaching triple digits through the weekend. The New Jersey Shore also has a Heat Advisory in effect until Saturday, with heat index values up to 103 degrees.