By Reginald Stanley. Posted October 18, 2022, 5:16 AM.

An upper low travelling east over Southern California late last week brought cool temperatures and scattered thunderstorms to the region, primarily on Saturday.

A deep marine layer had already been in place prior to the arrival of thunderstorms to the region on Saturday, as it had been for most nights of October so far. Thunderstorms impacted the mountains and deserts most of all, however this activity had expanded west of the mountains Saturday even as the upper low responsible was moving east towards Arizona. Thunder and lightning became widespread inland Saturday afternoon, particularly in San Diego, Riverside, San Bernardino and Orange counties. Precipitation totals varied, but generally fell between 0.1 and 0.5 inches where rain did fall. Lake Elsinore recorded the highest total in the WeatherCurrents network with a total of 0.52 inches, followed closely by Perris with 0.49 inches. In East Highland and Yucaipa, totals of 0.49 inches were reported each (courtesy of Peter Michas and Don Kramer, respectively). Moreno Valley was also in the higher end of rain totals with 0.47 inches.

Totals were drier in the more northerly locations in the WeatherCurrents network. Pinon Hills recorded only 0.06 inches, while WeatherCurrents' station in Simi Valley did not record any measurable precipitation at all. The southern reaches of the Temecula Valley and vicinity were also somewhat drier in comparison to other parts of the Inland Empire. In Temecula Valley's Wine Country, a total of 0.12 inches was reported (courtesy of Jim Sappington). WeatherCurrents' station in Anza had experienced an outage since Friday, while the rain gauge in Riverside (Orangecrest) is out of service.

Here are the rain totals for the WeatherCurrents network and associates: