A storm that was pounding California's Sierra Nevada with snow Tuesday took aim at the Colorado Rockies and could roll east and slam the Appalachians on Thanksgiving Day, bringing unsettled travel weather to millions of Americans hitting the skies and roads for the holiday weekend.

Heavy mountain snow will decrease Wednesday afternoon and end in the evening, but not before another two to six inches of snow stacks up, NWS forecasters said.

Eight states gave winter weather warnings, with heavy snow, strong winds, and unsafe travel conditions forecast until Thanksgiving. Follow Newsweek's live blog.