weather January 27, 2021 6:11 am What to Know About Atmospheric Rivers and How They Impact Storms in California Atmospheric rivers are like rivers in the sky. They’re behind some of California’s wettest winters. NBC4 forecaster Anthony Yanez shows how they work. US & World Videos 3:09 First Alert Forecast: What's ahead for the weekend 3:39 First Alert Forecast: May Gray Lingers 3:04 First Alert Forecast: Temperatures stay in the 60s and 70s 3:36 First Alert Forecast: More May Gray 3:21 First Alert Forecast: Slowly clearing marine layer