The wet weather fueled by an atmospheric river comes after a dry January helped ignite fires that devastated California. Here's what to know.

Call it an atmospheric river, a Pineapple Express or just weather, but some parts of California and the U.S. Northwest are being slammed by up to foot of rain before the storm runs out of moisture ...

The Pineapple Express is a stream of moisture in the atmosphere that delivers humid air from the tropical Pacific to the West ...

What's an Atmospheric River? A Pineapple Express? AP Explains the Weather Phenomenon Atmospheric rivers are a plume of moisture that extend across the Pacific to near Hawaii. When they hit land ...