The parade of atmospheric rivers that have doused California for three weeks finally faded on Monday, enabling some evacuees to return home and the state to concentrate on repairing the damage to washed out roads, breached levees and downed power lines. The nine consecutive rainstorms that pounded California in succession since Dec. 26 killed at least 20 people while tens of thousands remained under evacuation orders as of Monday, Governor Gavin Newsom said in an executive order that reinforced the state’s response to storm damage.