(CNN) Parts of the western US are on alert as an unusual summer-like heatwave grips the region. Records that had been in place for over 100 years fell on Tuesday in Napa, California, with highs topping just shy of 100 degrees. Record highs 90 and 89 degrees were observed on Monday and Tuesday, respectively. "Excessive heat warnings are in place for much of the Southwest into the valleys in California where highs will soar well past 100 degrees," CNN meteorologist Dave Hennen said. Over 20 million people are under either an excessive heat warning or advisory across the west.

Source: CNN May 27, 2020 22:44 UTC