The Brief

LOS ANGELES - A rare and powerful October storm is bringing heavy rain, high winds, and a threat of mudslides and tornadoes to Southern California, prompting evacuations and a state of emergency for some residents.

The storm, described by the National Weather Service as a "rare and very potent storm system," is expected to be unpredictable, with the worst impacts arriving Tuesday afternoon.

Evacuation warnings in effect

What we know:

Residents in areas burned in the Palisades Fire in Pacific Palisades, the Eaton Fire in Altadena , the Hurst Fire in Sylmar, and the Sunset Fire in the Hollywood Hills are advised to prepare to evacuate quickly if ordered, according to the Los Angeles Fire Department.

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