What is an atmospherical stream?

.FOR CALIFORNIANS it seemed like remembrance. In 2013 a march of tornados, fuelled through atmospheric rivers, gotten rid of at least 21 folks and led to nearly $5bn-worth of damage all over the condition. On February fourth this year the very same type of storm once again ravaged.

Hurricane-strength winds buffeted the core shore near Large Sur. In Los Angeles stars were actually saturated as they came to the Grammy honors’ red carpet. Estates in the Hollywood Hillsides were dealt with in dirt.

At least 3 folks have actually passed away. What are atmospheric streams, and are they a risk beyond California?