Much-needed rain has begun to fall over Southern California, bringing relief to the drought-stricken region but also the threat of toxic runoff.

Mudflows prompted the closures of at least some roads, including in Topanga Canyon and on parts of the Pacific Coast Highway.

Pacific Coast Highway in the city of Santa Monica has been reopened for residents and businesses. The Santa Monica Police Department has also lifted all city street closures. They ask residents to remain vigilant in areas that were previously under evacuation warnings.

The NWS Los Angeles/Oxnard CA issued an updated flood watch at 9:21 a.m. on Sunday valid from 10 a.m. until Monday 4 p.m. The watch is for Santa Clarita Valley, Malibu Coast, Western Santa Monica Mountains Recreational area,

A flood watch was issued by the NWS Los Angeles/Oxnard CA on Friday at 1 p.m. valid from Sunday 4 p.m. until Monday 4 p.m. The watch is for Santa Clarita Valley, Malibu Coast, Western Santa Monica Mountains Recreational area,

Forecasters in Southern California expect to issue a 'particularly dangerous situation' red flag warning for the coming week as the Santa Ana wind forecast worsens.

As winds across the Southern California area are calmer than their peak and firefighters are making progress, the threat to the fire-weary region remains with Santa Ana winds expected to continue in the coming days.

The Santa Ana winds are dry, powerful winds that blow down the mountains toward the Southern California coast. The region sees about 10 Santa Ana wind events a year on average, typically occurring from fall into January. When conditions are dry, as they are right now, these winds can become a severe fire hazard.

After multiple days of heavy rains provided Southern California with significant relief from a spate of catastrophic wildfires, experts are now warning of potential mudslides as debris flows run

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More than an inch (2.5 centimeters) of rain fell in many areas, loosening Los Angeles hillsides burned bare by the recent blaze near the Pacific Palisades neighborhood, where crews cleared inundated roadways including the famed Pacific Coast Highway.