What is actually a climatic waterway?

.FOR CALIFORNIANS it felt like remembrance. In 2014 a march of storms, fed through climatic streams, eliminated at least 21 people and also created nearly $5bn-worth of harm all over the condition. On February 4th this year the same sort of storm once again ravaged.

Hurricane-strength winds buffeted the central coastline near Significant Sur. In Los Angeles stars were actually soaked as they reached the Grammy awards’ red carpet. Manors in the Hollywood Hills were actually dealt with in mud.

A minimum of 3 people have perished. What are climatic rivers, and also are they a hazard beyond California?