.FOR CALIFORNIANS it thought that familiarity. Last year a procession of hurricanes, fed by atmospherical rivers, eliminated a minimum of 21 individuals and induced virtually $5bn-worth of damages all over the state. On February fourth this year the same sort of storm once more wreaked havoc. Hurricane-strength winds buffeted the central coastline near Big Sur. In Los Angeles famous people were soaked as they arrived at the Grammy awards' red carpet. Mansion houses in the Hollywood Hills were actually dealt with in mud. At the very least three individuals have passed away. What are actually atmospherical waterways, and also are they a hazard past The golden state?