Yucaipa police tweeted that the communities of "Oak Glen, Oak Glen Road, north & south, from Casa Blanca Road to the County Line, south from Wild Lilac Point down to WildWood Canyon Road, are subject to an evacuation ORDER."
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An evacuation shelter was being established at Redlands East Valley High School, 31000 E Colton Ave, Redlands
Residents in the community of Forest Falls were told to shelter in place until further notice.
Inland Empire communities inundated with mud after heavy rainfall
Heavy rains came to the Southern California region as a result of Tropical Storm Kay - formerly a hurricane - passing by offshore. The storm pushed heavy bands of moisture into the area and desert and mountain communities in particular saw the heaviest rainfall amounts.
A storm cell swept through parts of San Bernardino County Monday afternoon. Roads were washed out and some homes were damaged by mud.
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The area has burn scars from the El Dorado and Apple fires that have left the ground bare of brush that would normally slow the flow of water and mud down hillsides.
In the Potato Canyon area of San Bernardino County, torrential rains brought heavy downpours at the rate of an inch per hour. The rain overflowed and burst a creek, sending water and mud flowing into neighborhoods.
WATCH: Crews in Yucaipa area work to clear out debris after massive mud flows
Crews in Yucaipa area work to clear out debris after massive mud flows, flooding
Water flows also took out power lines and homes, as well as at least one restaurant. In the Perris area, people were seen standing on the roof of a car that was immobilized by a sudden mud flow.
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"This is the worst we've ever had, that I've seen up here in the 20 years I've been up here," said Ramon Rosas, of Yucaipa.
He added that the wall of his neighbor's house collapsed, sending mud piling into the home.
Bulldozers were dispatched to many neighborhoods in efforts to clear out the thick walls of mud that were blocking roads and homes.