A dangerous sequence of storms from the Pacific Ocean is sweeping through Northern California and the Sierra Nevada Mountains –– prompting heavy flooding and road closures across parts of the region during the busy holiday travel season. … Shasta County and other parts of Northern California remain under a flood warning until midday Monday, while much of Central California is under a flood watch until Friday. … Northern California will see its heaviest rainfall Monday and Tuesday – when up to 5 inches are expected across the Northern Sierra and 3 inches along the coastal regions, the NWS said Sunday. … Heavy snow is also forecast over the Sierras, where an additional 2 to 4 feet is expected – a stark contrast from the snow drought the Sierras are currently experiencing.

Other storm and flood news:

• Los Angeles Times: Southern California’s Christmas weather forecast keeps getting worse. What you need to know
• SFGate: Persistent ‘pineapple express’ to bring heavy rain, flooding to Bay Area
• Record Searchlight (Redding, Calif.): Redding hit by atmospheric rivers. What to know about them
• KCRA (Sacramento, Calif.): Atmospheric river forecast update: Heavy rain, gusty winds and feet of snow could disrupt plans during Christmas week
• The Tribune (San Luis Obispo, Calif.): Northern California under flood watch for Christmas week of atmospheric river storms
• Stanford University: Blog: Physics of atmospheric rivers, explained​
• Weather West: Blog: A wet and stormy week ahead in California, with substantial SoCal flood risk and initially warm Sierra rain transitioning to very heavy snow