Monsoonal moisture will return to Southern California on Friday and Saturday, and thunderstorms could hit the mountains, according to the National Weather Service.
The forecast gives about a 20 percent chance for measurable rain in the mountains of Riverside and San Bernardino counties both days. Unlike during the last bout of stormy weather, the valleys should stay mostly sunny, although gusty afternoon winds are expected.
Sunday through Wednesday, forecasters say a trough will set up over the coast that “effectively shuts down the monsoon (nonsoon).”
Temperatures in the valleys will range from 96 to 101 on Friday, the Weather Service says. After that, highs should stay consistently in the 90s over the weekend and through next week.
On Thursday afternoon, some storms mostly over Arizona also edged into the far western deserts of Riverside and San Bernardino counties, bringing up to 3 inches of rain and flash flooding in mostly remote areas, according to the Weather Service.
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