A flash flood watch has been issued for much of Los Angeles and Ventura counties ahead of two rainstorms that will increase the potential of debris flow in burn scar areas.

Areas charred by last month's wildfires in Southern California now face a new threat from a powerful, but fast-moving Pacific storm. Here's what you need to know about this threat.

A storm starting overnight Tuesday in California is expected to bring a high risk of debris flows later this week to the burn areas from the Los Angeles County fires. Between 2 and 3 inches of rain is expected to fall in the Palisades Fire area and between 3.

A new atmospheric river will bring a new rainstorm to the Los Angeles area in the middle of the week, forecasters say.