A river in the sky funnels storms from the tropics, sometimes with devastating results.

It may sound tropical and harmless, but the “Pineapple Express” is anything but lighthearted. This atmospheric river channels huge amounts of moisture from near Hawaii all the way to the U.S. West Coast, where it can unleash days of relentless rain and heavy snow. According to the National Weather Service, these events can trigger flash floods, landslides, and widespread damage when conditions align. While the phenomenon is natural, a warming climate is expected to intensify its impacts, making the Pineapple Express a storm pipeline worth watching closely.








