A heat dome is affecting the western United States, bringing dangerously high temperatures to the region. Millions of people are under heat alerts, with the majority residing in California, Nevada, and Arizona. The heat alerts extend northward to the Canadian border, indicating a widespread impact.

Temperatures are expected to be extremely high, with some areas potentially reaching record-breaking levels. Further details on the heat dome and its effects are available from KVIA ABC-7's source, which provides the latest updates on the situation.