Atmospheric river conditions could bring multiple feet of snow to the northern Sierra Nevada. Other areas face a risk of flooding as the ground becomes increasingly saturated.
The KCRA 3 weather team is issuing Impact Days through Tuesday because back-to-back storm systems will bring waves of rain and snow that can affect outdoor activities and travel.
An Atmospheric River in Northern California has brought plenty of overcast to the entire Central Coast. The weak ridge of high pressure from the south will increase daytime highs.