 ABC's Chuck Sievertson. Extreme heat is increasing concern about wildfires over the 4th of July, and the risk of fire sparked by fireworks. With triple-digit heat forecasts in parts of California in the days ahead, Fire Marshal Chris Bachman reminding residents in Contra Costa. Leave the shows to the pros. It's very unfortunate every year that we see injuries from the residents that are experimenting with these illegal fireworks.