What is an atmospheric waterway?

.FOR CALIFORNIANS it felt like recognition. In 2014 a parade of hurricanes, sustained through atmospherical rivers, killed at the very least 21 individuals and also induced virtually $5bn-worth of damage around the condition. On February 4th this year the very same kind of storm again wreaked havoc.

Hurricane-strength winds buffeted the core coast near Big Sur. In Los Angeles famous people were saturated as they arrived at the Grammy honors’ welcome mat. Mansions in the Hollywood Hillsides were covered in dirt.

At the very least three people have perished. What are atmospherical streams, and also are they a hazard past The golden state?