What is actually a climatic stream?

.FOR CALIFORNIANS it felt like du00e9ju00e0 vu. In 2013 a procession of tornados, fed by climatic streams, gotten rid of at the very least 21 individuals and created nearly $5bn-worth of harm around the state. On February fourth this year the same kind of tornado again wreaked havoc.

Hurricane-strength winds buffeted the core shore near Big Sur. In Los Angeles stars were soaked as they reached the Grammy awards’ welcome mat. Estates in the Hollywood Hills were actually dealt with in dirt.

At least three folks have actually died. What are atmospheric rivers, and also are they a threat beyond The golden state?