A record-challenging heat dome is about to bake the West with the summer’s hottest temperatures so far

An unusually strong heat dome will scorch much of the western United States this weekend, bringing the hottest temperatures so far this year to tens of millions from California to Canada.

​ An unusually strong heat dome will scorch much of the western United States this weekend, bringing the hottest temperatures so far this year to tens of millions from California to Canada. Read More Breaking News, Latest News and Videos | CNN