UPDATE 2-21-13 2:30PM PST
CNN is reporting 60 million people in Winter Storm Q's path this weekend.
A massive winter storm spanning 20 states could dump as much as a foot and a half of snow in some places Thursday and bring life to a standstill in parts of the central United States.
About 60 million people -- 20% of the U.S. population -- are under winter weather warnings, watches and advisories in the 750,000 square miles affected.
UPDATE: 2-21-13 2PM PST
As of Thursday afternoon, more than 600 flights had been canceled, according to FlightStats, thanks to what’s called Winter Storm Q. Parts of Kansas already has more than a foot of snow and whiteout conditions.
The storm is expected to move east into New England, so be prepared for possible flight delays in that region this weekend.
An 18-year-old man was killed Wednesday when the car he was traveling crashed in Oklahoma, where roads are a slushy mix of snow and ice. Reports say that with between seven and 12 inches of snow and blizzard conditions, this could be the worst storm in Oklahoma in two years.
According to a report by the AP, Cody Alexander, 18, was killed when the pickup truck he was driving skidded and crashed into oncoming traffic on one state highway, Oklahoma Highway Patrol officers said.
Meanwhile, in northern Arkansas, a school bus crashed and nearly flipped over on one snowy country road, injuring three students and the bus driver, AP reported.
The National Oceanic and Atmospheric Administration (NOAA) said on its website that a major winter storm will continue across much of the central US on Thursday.
Snow, heavy at times, will fall over much of the central Plains, with accumulations of more than a foot expected in some locations.
Meanwhile, sleet and freezing rain are likely across parts of the Mississippi and Ohio Valleys. Farther to the south, the system will bring the threat of severe weather to the Gulf Coast.
Track the storm here.
Winter storm warnings were issued from Colorado through Illinois, with as much as a foot of snow expected in several areas.
The National Weather Service meteorologist in Kansas said Thursday morning that the storm was moving slower than expected but that it was “starting to get back together.”
"It's very active," meteorologist Kelly Sugden said, noting the snowfall was mixed with lightning and sleet showers. This makes driving very dangerous.
Sugden said Wednesday's highest snowfall total for the state was 6 1/2 inches recorded in the tiny central town of Rozel. He said they were expecting heavy snow but not blizzard conditions. Still, he warned that the Interstate 70 corridor could see as much as 13 inches of snow with drifts adding to the danger for drivers.
The Associated Press is reporting some air line delays and cancelations
Updates will follow as the storm progresses