.FOR CALIFORNIANS it seemed like familiarity. In 2014 a march of hurricanes, fuelled through atmospherical waterways, killed at least 21 people and led to virtually $5bn-worth of harm throughout the state. On February 4th this year the very same form of storm once again wreaked havoc. Hurricane-strength winds buffeted the main coast near Major Sur. In Los Angeles celebs were actually soaked as they got to the Grammy awards' ceremony. Manors in the Hollywood Hills were covered in mud. A minimum of 3 individuals have passed away. What are atmospherical rivers, and are they a threat beyond The golden state?