What is actually an atmospherical stream?

.FOR CALIFORNIANS it felt like familiarity. In 2014 a march of tornados, fed through climatic streams, eliminated at the very least 21 people and also induced virtually $5bn-worth of damages around the state. On February 4th this year the very same sort of hurricane again created chaos.

Hurricane-strength winds buffeted the central shore near Significant Sur. In Los Angeles personalities were actually soaked as they got to the Grammy honors’ red carpet. Mansions in the Hollywood Hillsides were covered in dirt.

A minimum of 3 people have actually perished. What are actually atmospherical waterways, and are they a threat past The golden state?