Late night weather update:

With blizzard-like conditions in the Sierra, KTVU provides the latest weather update on the white-out conditions and the forecast in the Bay Area.

Mountain storm: Great water supply and skiing with a big dose of danger

California's mountains provide water, natural habitat, recreation, and tourism. That said, the mountains can provide real winter danger. As of Friday afternoon, I-80 westbound traffic is being turned at the Nevada State Line, and eastbound traffic on the same interstate is being turned around at Drum Forebay due to spin-outs, high winds, and low visibility.