Heavy precipitation is falling mostly in mountain areas. A flood watch in also in effect for the coast of central California, including the San Francisco Bay Area and Sacramento Valley.

A much wetter stretch is ahead from California to Washington as multiple systems crash into the Pacific Coast. Here’s how much rain and snow is on the way and when.

A weather system fueled by a "Pineapple Express" originating near Hawaii will unleash torrential rain across Northern California and southern Oregon throughout the week. Up to 20 inches of rain could lead to mudslides and mountain snow could total 6 feet.