.FOR CALIFORNIANS it seemed like du00e9ju00e0 vu. In 2015 a procession of tornados, fed through climatic rivers, eliminated a minimum of 21 folks and also led to almost $5bn-worth of damage all over the condition. On February fourth this year the same type of tornado again wreaked havoc. Hurricane-strength winds buffeted the main coastline near Big Sur. In Los Angeles famous people were actually saturated as they arrived at the Grammy awards' ceremony. Mansion houses in the Hollywood Hills were actually dealt with in mud. At least 3 folks have actually died. What are actually atmospherical rivers, and are they a threat beyond California?