Just when you think you’ve finally cooled off from the last heat wave, another one builds for the desert southwest. Excessive Heat Warnings and Heat Advisories are in place through Monday for southern California, Nevada and Arizona.
A stubborn ridge of high pressure that’s been locked in the Four Corners will gradually slide west into early next week. This is the same high that has been navigating heavy rainfall into the central US and helping induce monsoonal storms. However, as it slides its position, it will encounter drier air and limit convective potential.
Drier air heats up faster than warmer air. Just ask Thermal, CA in the Coachella Valley. They tied a record high Friday of 117 degrees!
The peak of this heat wave will likely top out on Monday. Cities in the San Joaquin Valley in California will hit the low triple digits for highs. Las Vegas will spend several days around 110. Palm Springs will approach 120, while Phoenix bakes around 110.
Temperatures will still be well above average on Tuesday, but will start on a downward trend. The meandering ridge of high pressure will start to weaken and work its way back east. The return of moisture and a trough edging into coastal California will help knock high temperatures back to normal by the middle of the week.
Heat is the number one weather related killer in the United States. To learn more about staying safe during heat waves, listen below to preparedness expert John Van Pelt.
For WeatherNation, Meteorologist Karissa Klos.