.FOR CALIFORNIANS it felt like familiarity. In 2014 a parade of hurricanes, sustained by atmospherical rivers, killed at least 21 folks and also caused virtually $5bn-worth of damage throughout the condition. On February 4th this year the same sort of tornado again created chaos. Hurricane-strength winds buffeted the main coast near Significant Sur. In Los Angeles stars were actually soaked as they came to the Grammy honors' welcome mat. Mansion houses in the Hollywood Hills were dealt with in mud. A minimum of three people have died. What are actually climatic waterways, and are they a risk beyond The golden state?