.FOR CALIFORNIANS it seemed like du00e9ju00e0 vu. In 2013 a march of storms, fuelled through atmospheric waterways, gotten rid of a minimum of 21 folks and triggered virtually $5bn-worth of damage all over the condition. On February 4th this year the same form of hurricane again created chaos. Hurricane-strength winds buffeted the main coastline near Big Sur. In Los Angeles personalities were saturated as they reached the Grammy awards' red carpet. Mansion houses in the Hollywood Hills were covered in dirt. At least 3 people have perished. What are actually atmospheric waterways, and also are they a threat beyond California?