text:  Extreme heat is increasing concern about wildfires over the 4th of July and the risk of fires sparked by fireworks. With triple-digit heat forecast in parts of California in the days ahead, Deputy Fire Chief Chris Bachman reminding folks there in Contra Costa Friday that fireworks are illegal in that county. We're anticipating 105 degree temperatures in Antioch on Wednesday, and this is setting the stage for a very dangerous holiday weekend.