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.

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.

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, already evident on weather maps this weekend, will bring a variety of hazards to the West over the next few days, such as major flooding, avalanches, strong winds and travel ...

The first of two “Pineapple Express” storms arrived in Southern California early Wednesday after delivering a stronger-than-expected pounding to Northern California, breaking rainfall records ...

The wet weather fueled by an atmospheric river represents an about-face after a dry January helped ignite fires that devastated California.

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