Earlier this month, California was drenched by atmospheric rivers. But what are they?
A river is a place where water accumulates and moves in the same direction. On land, rainfall gathers in gullies and gulches, joins with runoff from the surroundings, and forms tributaries and mighty rivers that flow to the sea. Water in the atmosphere behaves similarly, and forms rivers in the sky.
Compared to a river on land, atmospheric rivers change quickly."They're moving all of the time; they exist and then die out," Dominguez said."They're very dynamic in space and in time." [Rainbow Rivers: See Gorgeous Maps of the World's Waterways] Atmospheric rivers are responsible for most of the heavy rainfall in the western United States, and that's where much of the research on them has been conducted. There, atmospheric rivers can cause flooding, damage to property and deaths.
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