The National Oceanic and Atmospheric Administration has already warned of a moderate risk for excessive rainfall, highlighting areas from around San Francisco to Sacramento with the highest risk of flooding on Monday.
The greatest threat zone will sink south and include much of Central California on Tuesday.
Atmospheric river batters California while another is headed to the west coast. (Fox Weather)
"Rainfall is expected to bring another considerable flooding threat to elevations below 5,000 feet to Northern and Central California. This includes the San Joaquin and Sacramento valleys, southern Sierra Nevada foothills and the coastal region from San Francisco to the north of San Diego. Forecast models show between one and three inches of rain for many communities, with a few spots, especially along the coast and the foothills possibly receiving more," according to Fox Weather.
The system is expected to last into early Wednesday.
In Monterey County, the Pajaro River levee breached amid the Pineapple Express storm at approximately midnight on Friday, located upstream from the community of Pajaro.
More than 9,000 California residents were also under evacuation orders, including in Kern County, and hundreds of residents in Soquel were reportedly stranded in their Santa Cruz County homes after the only road in and out was washed out by floodwaters.
CALIFORNIA BRACES FOR ANOTHER ATMOSPHERIC RIVER FOLLOWING ONCE-IN-A-GENERATION STORM
"Just a tad anxiety-inducing, watching from our living room window," Heidi Crouch wrote on Facebook Friday.
Doug Barden shared a Kern River video to Twitter that stated, "#kernriver currently at 35,000 cfs and rising. View from backyard on Sirretta. #kern #californiarain #flooding"
Fox News' Julia Musto and the Associated Press contributed to this report.