.FOR CALIFORNIANS it thought that du00e9ju00e0 vu. In 2013 a march of storms, fed through atmospherical streams, killed a minimum of 21 individuals as well as led to almost $5bn-worth of damages across the condition. On February 4th this year the same type of hurricane once again created chaos. Hurricane-strength winds buffeted the core coastline near Major Sur. In Los Angeles celebrities were soaked as they got to the Grammy honors' red carpet. Mansions in the Hollywood Hillsides were actually dealt with in dirt. At the very least three people have died. What are atmospheric waterways, and also are they a threat beyond California?