What is a climatic waterway?

.FOR CALIFORNIANS it seemed like du00e9ju00e0 vu. Last year a march of tornados, sustained by climatic streams, gotten rid of a minimum of 21 people and also led to almost $5bn-worth of harm all over the state. On February 4th this year the same form of hurricane once more ravaged.

Hurricane-strength winds buffeted the central shoreline near Huge Sur. In Los Angeles famous people were actually saturated as they arrived at the Grammy honors’ ceremony. Estates in the Hollywood Hillsides were dealt with in dirt.

At the very least 3 folks have died. What are actually climatic rivers, and also are they a risk past California?