Snow will continue to fall into the evening in the Denver metro region, with the addition of high winds early Sunday evening, the National Weather Service warns.
Initial forecasts had put the storm's total at 10 inches, but by 5:30 p.m. as much as 8.5 inches had already fallen in Denver, according to Jim Kalina, a National Weather Service meteorologist in Boulder.
The foothills west of Denver had received as much as 21 inches by late Sunday afternoon, according to the National Weather Service.
The storm, which is expected to end Sunday night and bring with it bitter cold, has caused icy conditions on roads and highways — leading to some accidents — and forced delays and cancellations at Denver International
A blizzard warning remains in effect for the eastern metro area until 11 p.m. Wind gusts up to 40 mph could reduce visibility significantly, forecasters have warned.
The weather could begin to warm up slowly with a forecast high of 34 Wednesday, 37 on Thursday and 41 Friday, 47 on Saturday and 55 on Sunday, according to the outlook.
Denver's 70 snowplows are on the streets, clearing major arteries, said Ann Williams, spokeswoman for Denver's Department of Public Works.
For only the third time since two blizzards in December 2006 caused dangerous driving conditions that lasted for weeks on residential streets, the city is deploying some 120 four-by-four pickup trucks equipped with plows to sweep through 14,000 residential streets in the city, Williams said.
Crews are hoping to plow all those blocks in the next 48 hours, but it may take three days, Williams said. Plows won't scrape down to pavement, but will shave off layers of snow to avoid the deep ruts the that formed in 2006.
The residential plows are only deployed between Nov. 15 and March 15 under conditions that include prolonged freezing temperatures.
"We're seeing a lot of icy roads," Williams said. "The pavement is very cold and the snow is bonding to the pavement so we have a lot of slick conditions. We are trying to
The Federal Aviation Administration is reporting delays of up to two-and-one-half hours for arrivals and departures at DIA.
The airlines have reported approximately 200 departure and arrival cancellations, said DIA spokeswoman Laura Coale.
DIA averages 1,700 departure and arrival flights a day — on a average Sunday there are between 1,500 and 1,600 arriving and departing flights.
Airlines leaving the airport will be deicing throughout the day, so most flights can expect some delay, Coale said.
Denver Police tweeted Sunday afternoon that the city was no longer on accident alert, meaning people involved in accidents should call police for assistence in the event of an incident.
A driver of a vehicle that collided with a Colorado Department of Transportation snowplow on Highway 40 near Empire was taken to a hospital with serious injuries, according to the Colorado State Patrol.
The CDOT driver wasn't injured, said CDOT spokeswoman Mindy Crane.
DIA snow removal crews were also mobilized. Pena Boulevard has been chemically treated and is mostly wet with isolated areas of patchy thin slush. Runways are clear and open.
DIA has more than 250 pieces of snow removal equipment and about 500 snow removal personnel.
Tom McGhee: 303-954-1671, email@example.com or twitter.com/dpmcghee. Reporter Joey Bunch conbributed to this story.