Widespread Shower and Thunderstorm Activity Across Southern California Tuesday through Saturday, Week of September 1st, 2025; Details

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Southern California Weather Force has issued a Special Weather Statement as once again be in the firing zone for showers and thunderstorms, some severe, as a strong monsoon flow enters the area during the first week of September so read on for details …

A complex atmosphere will be developing across the Southwestern United States starting on Monday.  A ridge of high pressure will form over Utah.  When this happens, the clockwise flow around it brings monsoon moisture and upper dynamics out of Mexico and into Southern California.  on Tuesday, expecting moisture to enter during the early morning hours across the region, as far west as Ventura and Kern County this time.  This is when you have your best chance that far west to receive any type of shower or thunderstorm activity.

As Wednesday through Friday hits, we will have numerous thunderstorms in Arizona.  This will develop a complex pattern in which there is no actual ridge of high pressure anymore, but more of multiple mini-low pressure centers across the area.  This scenario would bring an explosive thunderstorm event for the low and high desert zones, all of the mountains, the valleys, and even as far as the coasts of Los Angeles, Orange San Diego County, and of course this includes the Inland Empire zones.  A multi-day thunderstorm event is expected, which will be the strongest monsoon moisture flow impact this season thus far.

Once again, I do expect the Elsinore Convergence Zones to light up during this period, which means Elsinore, Perris (middle of the zones) Hemet, Banning, Beaumont, and Yucaipa.

This is all due to what will be a hurricane that develops south of here, moving closer than Juliette did.  As I stated in the previous update, September will feature these events.

Southern California Weather Force will be on standby during the morning hours each day to issue any thunderstorm or severe thunderstorm watches for the app/email system between 9-10am and noon for social media.

Raiden Storm
Master General Meteorologist


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