Sign up for the Morning Brief email newsletter to get weekday updates from The Weather Channel and our meteorologists. An atmospheric river is a weather feature that ...

The storm is due to an "atmospheric river" effect, a phenomenon in which water evaporates into the air and is carried along by the wind, forming long currents that flow in the sky like rivers flow ...

It is the result of an "atmospheric river" effect, which is caused by airborne currents of dense moisture. About 37 million residents, or 94% of the population, are under flood alerts. As the ...