Multiple winter storm warnings have been issued by the National Weather Service (NWS) as it forecasts that three states could get winds reaching 70 mph and up to 20 inches of snow from Sunday or Monday—lasting until Wednesday—which is likely to cause “ whiteout conditions .” Winter storm conditions are likely to hit counties in California , Nevada , and Alaska . The NWS has advised people who must travel to “ keep an extra flashlight , food, and water in your vehicle in case of an emergency,”