Atmospheric river: 'Life-threatening' storm lashes California with rain, wind and snow - BBC News

Some residents were told to evacuate before "one of the most dramatic weather days in recent memory".

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Ben Rich explains how an atmospheric river forms

Nearly 500,000 California residents have lost power as forecasters warn of "one of the most dramatic weather days in recent memory".

Heavy rain and high winds are now lashing an area from Santa Barbara to Los Angeles, and could bring "life-threatening" flooding through Tuesday.

It is the result of an "atmospheric river" effect, which is caused by airborne currents of dense moisture.

https://www.bbc.co.uk/news/world-us-canada-68185319?at_medium=RSS&at_campaign=KARANGA

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