.FOR CALIFORNIANS it seemed like recognition. In 2015 a march of tornados, fuelled through atmospherical streams, killed a minimum of 21 individuals and triggered nearly $5bn-worth of damages all over the state. On February 4th this year the very same form of tornado again created chaos. Hurricane-strength winds buffeted the main shoreline near Big Sur. In Los Angeles celebrities were soaked as they got to the Grammy awards' ceremony. Mansion houses in the Hollywood Hillsides were dealt with in dirt. At the very least 3 people have actually perished. What are actually atmospheric streams, and also are they a threat past California?