Airport workers handed out blankets, diapers, baby formula, toothbrushes and toothpaste to passengers who camped out on floors and in chairs.
Crews were using more than 20 pieces of equipment, including snowplows, brooms and sand trucks, to clear and keep the runways open on Tuesday.
The northern Rocky Mountains and Sierra Nevada should expect to "get hammered with blizzard conditions", and 1-3ft of snow in the coming days, causing "severe travel disruptions", the National Weather Service reported.
Air travel from Atlanta to NY could also be impacted by storms, and travel delays are expected in the Northeast.
The storm dumped almost 3 feet (1 meter) of snow in parts of northern Colorado and closed long stretches of highways there and in Wyoming.
We are still watching for some ice across the state Friday.
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Hundreds of cars spun out in blizzard conditions where Interstate 5 traverses high mountain passes between OR and California and some travelers were stranded for 17 hours OR more and slept in their vehicles.
More than 144,000 homes and businesses were without power late Thursday morning nationwide, mainly in California, Michigan, Wisconsin, Pennsylvania and ME, according to utility tracking site PowerOutage.us.
Scores of vehicles got stuck on Interstate 5 after a "bomb cyclone" - a supercharged winter storm caused by a rapid drop in atmospheric pressure - dumped up to four feet of snow in mountainous areas of the Pacific Northwest.
"This storm threatens to bring rain and mountain snow to much of California, including places like San Francisco and Sacramento, places that were largely spared by the past week's rain", said Accuweather senior meteorologist Brian Thompson.
Organisers have said they will make a decision today morning.
The stretch of Interstate 5 known as the Grapevine was shut down Thursday morning as a strong storm and snowy conditions wreaked havoc in the region and forced holiday travelers to seek alternate routes.
"It's blowing pretty good outside but because we're right on the coast, everything was built to ensure the safety of people", Smith said.
Even as the storms bought rain, snow and high winds to the Upper Midwest and far Western states, they spared the highly populated East Coast and central Midwest, which were also expected to fare well as travellers go back home on Sunday. The approaching storm accelerated the annual winter closure of the highway leading to the North Rim of the Grand Canyon by five days. Koenig reported from Dallas.