What appears to be a towering "dust devil" in Perris, just east of I-215 and Ramona Expressway, on Aug. 30, 2013.
Flash flood and a severe thunderstorm warnings were issued in parts of the Inland Empire on Friday as strong storm cells continued west over the region.
The latest round of wild weather brought strong storms and subsequent flooding and mud flow to Riverside County, and residents reported seeing what appeared to be a towering dust devil forming over Perris.
"I've never seen the rain pour down this hard before," said Riverside resident Bernadette Ayala.
Significant damage was reported in Riverside. The storm knocked down nearly every tree at Lincoln Park, and one century-old tree fell down on a nearly 100-year-old house.
Streets and parking lots in Perris were submerged under feet of water.
Temperatures climbed beyond 100 degrees in many areas of SoCal and humidity was double the norm Friday, according to NBC4 forecaster Fritz Coleman.
Several regions of Southern California are under extreme weather warnings and watches, according to the National Weather Service.
Flash flood warnings are in affect for the following areas:
A flash flood watch is in affect for San Bernardino County until 11 p.m. Saturday
A flood watch is in affect for the Antelope Valley, Los Angeles County Mountains excluding the Santa Monica Range, and Ventura County Mountains until 11 p.m. Friday.
Come Sunday, a southwesterly wind should push the uncomfortable moisture out of the region just in time for Labor Day.
More Southern California Stories: