A winter storm warning is in effect for much of the Colorado Rocky Mountains as most of the region is expected to see between 1 and 2 feet of snow over the weekend, according to the National Weather Service.

For Vail, Aspen and Snowmass, up to 10 to 20 inches of snow accumulation is expected from late Friday morning through 5 a.m. Sunday, when the storm warning expires. Travel could be very difficult as blowing snow could significantly reduce visibility, especially on mountain ridges.

In Summit County, Winter Park and Rocky Mountain National Park, snow is expected to start later Friday evening and last through early Sunday morning, the storm warning states. Travel Friday and Saturday could be difficult as wet, heavy snow could result in slick, snow-packed roads.

In a joint news release Friday, local authorities in Summit County as well as Colorado State Patrol warned that travelers should be prepared for the major winter cycle in the mountains.

Previous storms have closed roads, rerouting traffic from various destinations through Summit County. That has contributed to heavy congestion where motorists have been stuck for 8-12 hours on a trip that typically takes less than 2 hours, the release states. 

Emergency planners in Summit County advise drivers to check for weather and closures and be prepared for delays, including by having a full tank of gas. Road closures may delay drivers for lengthy periods on highways and leave few options for last-minute lodging, the release states.

Drivers need to ensure that their vehicle and passengers are ready for winter travel in the mountains with adequate tires, traction devices, snow shovels, tow ropes and emergency equipment.

When stuck in standstill traffic, drivers need to be aware of emergency vehicles approaching and must pull to the side immediately when they see lights in their rear-view mirrors, the release states. Both snowplows and emergency vehicles need plenty of room to operate, so do not follow them closely or attempt to pass them.

Residents and visitors should be prepared to alter travel plans and avoid unnecessary travel during the snowstorm when road conditions will be at their worst, according to the news release.

Summit Fire & EMS, Red, White & Blue Fire Protection District, the Summit County Sheriff’s Office, the towns of Breckenridge, Silverthorne, Dillon, Frisco and Blue River and the Summit County government contributed to the news release.