NOAA: Atmospheric River Event for California Sunday-Monday NOAA is now calling this weekend’s storm coming to California an Atmospheric River Event.ย Precipitation totals will be highest in the Sierra Nevada mountains during this event. A Winter Storm Watch is in effect for the Sierra Nevada mountains that is calling for up to 16-inches of snowfall on Sunday and Monday. “An atmospheric river is currently impacting the Pacific […] Weather WeatherBrains | October 31, 2015 0 Comments