What are the atmospheric rivers contributing to severe California flooding? - BBC News

Like water flows through rivers on land, water vapour flows through atmospheric rivers in the sky.
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Watch: California hit with record-breaking rain and flooding
Atmospheric rivers may sound like a description in a travel blog, but these phenomena can cause serious damage.
They occur when water evaporates into the air and is carried along by the wind, forming long currents that flow in the sky like rivers flow on land.
They can cause severe rains and mountain snow.
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