Weather systems that affect the West Coast of the United States often have their origins in the northern Pacific Ocean. This is because the jet stream usually flows in a general west-to-east fashion.

Atmospheric rivers are a plume of moisture that extend across the Pacific to near Hawaii. When they hit land they can cause heavy rains and snow. Here’s a look at the phenomenon: Atmospheric rivers ...

A powerful atmospheric river will hit the Pacific Northwest starting Thursday, bringing heavy rain, gusty winds and mountain ...

PORTLAND, Ore. — Editor's note: the video above was published in November 2022 and describes a specific weather event that was underway in Portland at the time, but it includes a general-purpose ...

Atmospheric rivers are a plume of moisture that extend across the Pacific to near Hawaii. When they hit land they can cause heavy rains and snow. Here’s a look at the phenomenon: What is an ...

Atmospheric rivers are long and relatively narrow bands of water vapor that form over an ocean and flow through the sky, transporting much of the moisture from the tropics to northern latitudes.