More than 2,000 flights were canceled in and out of Denver alone over the weekend. Runways were closed for Sunday night, the Denver International Airport tweeted, as it marked nearly two inches of snow.

Many highways and local roads were closed, including a few with "no alternate route advised."

In Colorado, some areas already had almost 30 inches of snow by noon Sunday. A foot of snow had fallen in Denver, and more was on the way.

"Total snow accumulations of 12-24 inches for the Interstate 25 corridor and up to 3-4 feet in the northern foothills," the National Weather Service warned. "Wind gusts of 30-40 mph will cause some blowing and drifting snow."

The Colorado Department of Transportation reported a slew of highway closures, including swaths of Interstate 70 that runs east to west across the state. The Colorado Avalanche Information Center set the avalanche risk as high, warning of "very dangerous avalanche conditions."

"Slow to ramp up Saturday, storm makes itself known on Sunday," the state Transportation Department tweeted Sunday afternoon. "Return travel from the mountains into #Denver will be extremely challenging Sunday. Motorists please make plans to postpone travel until Monday." [...]

Nebraska's State Patrol tweeted asking people across the western part of the state to stay home to avoid strong winds and blizzard conditions. The Department of Transportation urged people across the state to avoid travel if at all possible, reported the Omaha World-Herald.

RAW: Time-lapse of snow building up on a table in Colorado

Blizzard Warnings are now in effect until midnight for the Front Range and foothills. Look for an additional 2-6" of snow and gusty winds near 45mph.

Credit: Eric Frazier, Fort Collins