The UC Berkeley Central Sierra Snow Lab, a research institute based in Soda Springs, a census-designated place 89 miles northeast of Sacramento, tweeted Monday morning that the area had already seen 13.2 inches of snow in the last 24 hours and was expecting up to 30 more through Tuesday.
Rainfall amounts could reach 6 to 8 inches in parts of the Sierra Nevada and Southern California in the coming days. Snowfall amounts will be up to 4 feet above 7,000 feet and 8 feet above 9,000 feet.
"Considerable flooding impacts" are also expected below 5,000-foot elevation along the central California coast, San Joaquin Valley, Sacramento Valley and southern Sierra Nevada foothills into Tuesday, it said.
Areas most likely to see isolated flooding Monday include Eureka, Redding and Santa Rosa.
The weather service further warned that heavy rain and snowmelt could lead to renewed and more widespread flooding, particularly in low elevations.
"Some heavy snow can also be expected farther inland across the Intermountain West, especially central Idaho and western Wyoming," it said.
