A unique weather situation is shaping up for late October. Here's what an atmospheric river means and why it matters.

Heavy rainfall will have the potential to produce flooding west of the Cascades in Washington and Oregon,” the CPC said.

Atmospheric rivers are defined as rivers of water vapor in the sky. They can bring heavy rain or snow storms upon landfall and usually last 3-7 days.

October atmospheric river could bring heavy rain and high-elevation snow to the Sierra, affecting travel along I-80 near Reno ...

One storm isn’t enough to change those fortunes, but Ralph says it will help. The storm dumped more than two inches of rain ...

This videodisc explores how Scripps Institution of Oceanography scientists are developing new instruments for studying interactions between oceans and atmosphere. They are trying to understand the why ...