What is actually an atmospherical stream?

.FOR CALIFORNIANS it felt like du00e9ju00e0 vu. In 2015 a march of storms, fuelled by climatic streams, eliminated a minimum of 21 people as well as triggered nearly $5bn-worth of damages around the state. On February 4th this year the same kind of tornado again ravaged.

Hurricane-strength winds buffeted the central coast near Huge Sur. In Los Angeles personalities were actually saturated as they got to the Grammy honors’ welcome mat. Mansions in the Hollywood Hillsides were actually covered in dirt.

At the very least three folks have actually died. What are actually atmospherical waterways, and are they a danger beyond California?