 is believed to be human-caused. Fox's Therese Crowley. This is a heat dome remains over the western U.S. with above-average temperatures forecast for the next six to ten days. The CDC says Colorado farm workers who got bird flu were working during extreme heat, which made wearing protective equipment difficult. At least eight workers, possibly a ninth, contracted avian flu this year from infected dairy cows in three states. The Dow is up 547 points. Lisa Brady, Fox News.