What is actually a climatic river?

.FOR CALIFORNIANS it thought that du00e9ju00e0 vu. In 2013 a march of tornados, fuelled by climatic waterways, killed at least 21 individuals and also triggered nearly $5bn-worth of damage across the state. On February 4th this year the exact same kind of tornado once again wreaked havoc.

Hurricane-strength winds buffeted the core coast near Huge Sur. In Los Angeles celebs were saturated as they reached the Grammy honors’ welcome mat. Manors in the Hollywood Hills were dealt with in dirt.

A minimum of 3 individuals have actually perished. What are actually atmospherical rivers, and are they a threat beyond California?