The definition: An atmospheric river (AR) is a long plume of moisture that stretches from the tropics or subtropics into higher latitudes, often thousands of miles long. These thin ribbons of humid ...

After an atmospheric river doused the North Bay Tuesday, forecasters say more rain will return to the region Thursday and Friday. Residents can also expect temperatures to drop below freezing ...

A group of scientists from Southern California recently came to the Bay Area to send up a series of weather balloons to help ...

An atmospheric ... the West Coast of North America ahead of a strong Pacific cold front at least once or twice each fall, winter or spring. But ARs also happen over the Atlantic and South Pacific ...