.FOR CALIFORNIANS it believed that du00e9ju00e0 vu. In 2013 a ceremony of storms, sustained by atmospherical waterways, eliminated at least 21 individuals and also led to virtually $5bn-worth of damages across the condition. On February fourth this year the same form of hurricane once more wreaked havoc. Hurricane-strength winds buffeted the main shoreline near Major Sur. In Los Angeles stars were soaked as they arrived at the Grammy awards' welcome mat. Mansion houses in the Hollywood Hillsides were covered in mud. A minimum of three people have perished. What are actually climatic rivers, and are they a risk beyond California?