Santa Ana Mountains/Foothills, Orange County and San Bernardino County Mountains are under a flash flood watch which was issued by the National Weather Service on Monday at 2:15 a.m. The watch is

Much of the Bay Area was temporarily under a flood advisory Monday as heavy rainfall drenched the area during the biggest storm in months, with minor flooding reported in San Francisco, flash flooding threatening a recently scorched spot in Napa County and traffic incidents snarling the afternoon commute.

Marin, Napa and Sonoma counties are included in a flood advisory issued by the National Weather Service on Monday at 3:25 p.m. The advisory is in effect until 6:30 p.m.

The National Weather Service said the burn scar east of Calistoga remains vulnerable to debris flows as rain continues across the North Bay.

Areas of thunderstorms with very heavy rainfall continue to affect portions of the Phoenix area and points south from Gila Bend towards Maricopa. Flash flooding will be a big hazard so please stay off flooded roadways! TURN AROUND, DON’T DROWN! #azwx pic.twitter.com/1CqKGk1WE3

Santa Clara and Santa Cruz counties are included in an updated flood advisory released by the National Weather Service on Monday at 6:34 p.m. The advisory is in effect until 9:30 p.m.

A cold and dynamic storm is forecast to soak much of California early this week as a strong low-pressure system drops south from the Pacific Northwest. It’s the first major Pacific storm of the season and expected to bring widespread rain,

Monday morning in Oregon and Northern California already saw a series of showers, while rain and high-elevation snow are forecast to expand as the storm moves southward along the Pacific coast. AccuWeather Meteorologist Chad Merrill explained,