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Heavy rains in Southern California cause flash flooding and mud slides

On Wednesday, torrential rains caused flash flooding and mud slides across Southern California. Authorities warned drivers to stay off the roads while urging those in flood zones either to evacuate or to shelter in place.

Christopher Prater, spokesperson for the San Bernardino County Fire Department, said that emergency crews were busy answering rescue calls in the mountain resort of Wrightwood east of Los Angeles. They also pulled drivers from submerged cars.

According to Prater, no casualties had been reported by Wednesday night.

The fire department posted aerial video footage online showing rivers of mud flowing through flooded cabin neighborhoods.

The latest atmospheric storm in the region, a huge airborne current of "dense" moisture that was swept from the Pacific and into the greater Los Angeles area, caused downpours of up to?inch (2.54cm) of rain per hour.

According to the U.S. National Weather Service, the storm that began on Christmas Eve was expected to continue into Friday. This would create unsafe driving conditions in a period of travel which is normally busy during holidays.

The weather service warned that "widespread flash flooding" was expected to occur in Southern California on Christmas Day.

The flash flood warning was displayed across Los Angeles County up until 6 pm PST. It warned motorists to avoid the area if they were not fleeing it, or if there was an evacuation order.

Los Angeles officials have urged residents in the area where wildfires last year ravaged?Pacific Palisades to obey evacuation orders for 130 homes deemed especially vulnerable to debris flows and mudslides.

San Bernardino County Sheriff's Department had issued an evacuation order for Wrightwood in the morning, but the advisory was upgraded to a shelter in place order as the flood conditions worsened. Flooding forced the closure of two sections of the Angeles Crest Highway (a major traffic route in San Gabriel Mountains).

The heavy rain on Wednesday was accompanied with strong winds, which officials claimed were responsible for the downing of trees and powerlines. The storm was predicted to bring heavy snowfall in the Sierra Mountains' upper elevations.

NWS meteorologist Ariel Cohen said that 4 to 8 inches had fallen on some foothill areas as of 9 a.m. Los Angeles City News Service and PST reported many rockslides. Forecasts predicted that more than one foot (30.48cm) of rain would fall over certain lower-terrain mountain regions by the end of this week.

A rare tornado warning was issued for a small area of the east-central Los Angeles County, due to thunderstorm activity in Alhambra.

Forecasters say that the rain in the area has subsided as of Wednesday night. However, a second storm system is expected to arrive on Thursday.

(source: Reuters)