Sunday night, the Santa Cruz County sheriff-coroner issued an evacuation warning urging residents of low-elevation communities to prepare to flee with little notice by packing necessary belongings."This is a very big storm, very widespread impacts across much of the state that we're hoping the Californians will keep an eye on through the next couple of days," National Weather Service regional meteorologist Eric Schoening said at a state news conference Sunday evening.The National Weather Service said Sunday in a bulletin that the back-to-back storms could produce mudslides, flash flooding and debris flows.At least six people have died in the severe weather since New Year’s weekend, including a toddler killed by a fallen redwood tree that crushed a mobile home in Northern California.Climate change has already made extreme precipitation in California twice as likely, with extreme weather predicted to generate 200% to 400% of surface runoff — rainwater that cannot be absorbed by soil — by the end of the century, according to research by the UCLA environment and sustainability department."