Atmospheric rivers usually deliver up to 50% of California's annual precipitation.
A powerful cyclone fed by a so-called atmospheric river off the U.S. West Coast pictured by a weather satellite.
A new atmospheric river is expected to arrive Friday night, bringing more deluge to the coast and heavy snowfall to mountain regions. This stormy January comes after above average rainfall in December, which saw over 11.6 inches of rain in San Francisco, according to theMost of the moisture causing the deluges is being channeled from Hawai'i by so-called atmospheric rivers, channels that form inand funnel water vapor from humid tropical regions to drier areas farther away from the equator.
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