Heat dome triggers record-breaking temperatures across US West Coast

A man walks on the sidewalk in front of a temperature monitor that reads 104 F in Joshua Tree, California.

Millions of people will likely experience record high temperatures in the coming days and weeks as a heat wave takes hold of the U.S. West Coast.

An estimated 36 million people — roughly 10% of the U.S. population — will be affected in California, Arizona, Oregon, Washington and Nevada, Reuters reported on Sunday (July 7).