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: ...

Copyright 2025 The Associated Press. All Rights Reserved. Workers shield themselves from the rain at the Griffith Park Observatory Thursday, Feb. 13, 2025, in Los ...

FILE - Residents evacuate past damaged vehicles after storms caused a mudslide, Monday, Feb. 5, 2024, in the Beverly Crest area of Los Angeles. (AP Photo/Marcio Jose Sanchez, File) ...

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.

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 ...