LOS ANGELES (CBS) A weather warning has been issued by the  National Weather Service (NWS) for Los Angeles and Oxnard for this Friday and Saturday.

According to the NWS, a powerful winter storm will affect southwestern California Friday through Saturday night causing flash flooding and possible debris flows for recent burn areas.

The strong frontal system associated with this storm will sweep through the region Friday and Friday night bringing with it periods of heavy rain with embedded thunderstorms. The main front is most likely to affect Santa Barbara and Ventura counties Friday afternoon and evening and Los Angeles county late Friday afternoon through to just after midnight.

Behind the front, cold, moist and unstable air associated with the center of the upper low will bring numerous showers and isolated thunderstorms to the region through Saturday,  with the greatest threat happening during the afternoon and evening hours.

Areas affected include: Los Angeles County mountains excluding the Santa Monica Range, Antellope Valley, Los Angeles County, San Fernando Valley, San Gabriel Valley including Acton, Mount Wilson, Sandberg, Lancaster, Palmdale, Woodland Hills, Northridge, Burbank, Universal City, Pasadena and Pomona

Rainfall could exceed one inch per hour at times, exceeding thresholds determined to be safe.  Rainfall is expected to average 1 to 3 inches in coastal and valley areas and 3 to 6 inches in the foothills and mountains.

Residents in or below the recently burned areas are urged to take the steps necessary to protect their property. Persons in the watch area should remain alert and follow the directions of emergency preparedness officials.

(©2011 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. Wire services contributed to this report.)

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