Life threatening and damaging Flash Flooding likely across much ofcentral/southern California through Monday.Heavy Snow for parts of the Sierra Nevada and the Great Basin.The ongoing Atmospheric River event will continue to produce heavy rain,strong winds, high surf, and heavy snow across much of central andsouthern California over the next few days. High rain rates over veryvulnerable/primed surfaces will lead to flash flooding tonight acrossportions of central and southern California, which...