Los Angeles County is under a flash flood warning which was released by the National Weather Service on Wednesday at 5:35 a.m. The warning is in effect until noon.

Waves of atmospheric moisture could cause urban flooding and mudslides across California this week, according to the National Weather Service.

A flash flood warning was issued by the National Weather Service in Los Angeles-Oxnard at 4:02 a.m. on Wednesday, Dec. 24.

Los Angeles and Ventura counties were placed under an updated flood advisory by the National Weather Service on Wednesday at 2:45 a.m. The advisory is in effect until 4 p.m.

On Wednesday at 4:02 a.m. a flash flood warning was issued by the NWS Los Angeles/Oxnard CA in effect until 9 a.m. for Santa Barbara and Ventura counties.

Freeway north of LA is under an updated flood watch which was issued by the National Weather Service on Sunday at 12:26 p.m. The watch is valid from Tuesday 4 p.m. until Wednesday Dec. 24, at 10

A major storm is gearing up to deliver months’ worth of rain and powerful winds to Southern California — the most potent in a slew of atmospheric river-fueled storms aiming for the region this week.

A powerful atmospheric river storm will bring life-threatening flooding, 80 mph winds, and up to 12 inches of rain to Southern California through Christmas week, according to the National Weather Service.

Potentially catastrophic rain is heading toward Los Angeles -- a region already scarred by recent extreme weather and climate events, making it more vulnerable.