Showers, Thunderstorms Forecast For Riverside County

RIVERSIDE COUNTY, CA — Parts of Riverside County could see strong showers, thunder and lightning as monsoonal moisture moves over the region by midweek, according to the National Weather Service.

The thunderstorms are expected to isolate over the county's mountains and desert regions Wednesday and Thursday, bringing the possibility of mudslides in burn scar areas. Affected areas include the Riverside County mountains, the San Bernardino County mountains, Banning and the Coachella Valley, according to the National Weather Service.

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Lightning could increase the wildfire risk, according to the weather service.

The days were expected to be noticeably warmer Monday and Tuesday, especially in the valleys as the marine layer thins.

High temperatures in Banning are expected to hover in the 90s, peaking Tuesday at 101 degrees. Palm Desert is expected to stay above 100 degrees all week, peaking at 108 degrees Tuesday. Temperatures will be slightly cooler in Southwest Riverside County where Murrieta is expected to remain in the mid to high 90s all week, Lake Elsinore could ht 100 on Tuesday, and Temecula will hover in the low 90s for the week, according to Accuweather.

Drier air and building high-pressure Monday into Tuesday may limit any shower development, but a monsoon flow should return by Wednesday as high pressure weakens, renewing thunderstorm activity over mountain and desert areas.

Longer-range outlooks show hotter conditions toward the end of the month as an upper high becomes established over the southwest, forecasters said.

City News Service and Patch Staffer Paige Austin contributed to this report.