.FOR CALIFORNIANS it seemed like du00e9ju00e0 vu. In 2013 a march of tornados, fuelled through atmospherical streams, gotten rid of a minimum of 21 folks and triggered nearly $5bn-worth of damages across the state. On February fourth this year the same kind of hurricane once more ravaged. Hurricane-strength winds buffeted the central coastline near Big Sur. In Los Angeles famous people were actually soaked as they arrived at the Grammy honors' ceremony. Mansion houses in the Hollywood Hills were actually covered in dirt. At least three people have perished. What are climatic streams, and are they a risk beyond The golden state?