‘Atmospheric Rivers’ Bring Snow, Rain, Flood Threat to California

The first of two atmospheric rivers, a long stretch of moisture that builds up from the tropics, brought rain to Southern California, snow to the Sierra Nevada region and the threat of flooding in Yosemite National Park and other parts of the state.The express train of wet and snowy conditions slammed the state Thursday morning, and another system is expected this weekend and possibly into next week.