Pineapple Express has drenched Northern California in the last few days—but what exactly is it? How common is it? Also, go 'Beyond the nugget' to learn about the polar vortex and the Santa Ana winds.

Interstate 680 southbound around Sunol, California, US Video Recording Date/Time: February 4, 2025 at about 17:00h An atmospheric river brought heavy rain and strong winds to the San Francisco Bay ...