Snow will overspread a vast area from the Sierras to the central and southern Rockies today as a storm system moves inland through California.
Heavy mountain snow will pile up in the Sierras, while cold air advancing into California will send snow levels plummeting. Rare snowflakes could even be seen in areas below 500 feet.
Up to 2 feet of snow will fall in the mountains of California, Arizona, Utah, Colorado and New Mexico.
By tonight, the heaviest snow will target the Four Corners region. A combination of howling winds and snow could create blizzard conditions in spots.
The powerful winds, with gusts past 40 mph at times, will roar over the area tonight into Tuesday. Reduced visibility and drifting from blowing snow will create treacherous and even impossible driving conditions.
Snow and wind will then pound a swath from Denver to Chicago on Tuesday with a similar outcome.
Widespread delays and cancellations could plague airline passengers, especially since the harsh weather will affect several major travel hubs in the nation's midsection. Ripple-effect delays could even lead to delays at other airports across the country.