Atmospheric rivers are long and relatively narrow bands of water vapor that form over an ocean. Some get the nickname ...

A pineapple express is a type of strong atmospheric river that carries moisture toward the western U.S., bringing the risk of ...

The atmospheric river's effects are expected to last at least through Tuesday, one meteorologist told Newsweek.

BBC Weather's Elizabeth Rizzini looks at the meteorological phenomenon hitting North America's west coast. When it comes to ...

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

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.

You may have heard meteorologists using the phrases "atmospheric river" and "Pineapple Express" when talking about wet weather in California, but what do they really mean?

This story was updated to correct spelling in headline. An atmospheric phenomenon called a Pineapple Express is expected to bring heavy rains and snowfall to California and the Northwest this week.