.FOR CALIFORNIANS it felt like recognition. Last year a march of hurricanes, sustained by atmospheric waterways, killed a minimum of 21 people and triggered almost $5bn-worth of damages throughout the condition. On February fourth this year the exact same form of tornado once more wreaked havoc. Hurricane-strength winds buffeted the central coastline near Large Sur. In Los Angeles celebrities were saturated as they arrived at the Grammy awards' welcome mat. Residences in the Hollywood Hills were actually covered in dirt. At the very least three people have perished. What are climatic streams, and also are they a danger past California?