With an incoming snow storm set to dump between 9 and 18 inches of snow at higher elevations, the Colorado Department of Transportation warns drivers that two major highways may experience closures this weekend. 

CDOT says heavy snow and 50-to-70 mph winds may result in whiteout-like conditions west of the metro, increasing the likelihood of safety closures for Interstate 70 and U.S. 40 overnight through Sunday, according to a press release from the department.

The National Weather Service has issued a winter storm warning, in effect from 5 p.m., Saturday to 9 a.m., Monday for several mountainous zones.

“The closure of U.S. 40, if necessary, will enable crews to safely conduct winter maintenance operations on Berthoud Pass,” the department said.

The department urges drivers heading westward to prepare for slick conditions and make sure their tires pass Traction Law requirements — meaning drivers must have four-wheel driver or all-wheel drive vehicles with snow tires with at least 3/16” tread depth.

Colorado State Patrol strongly advised that people avoid traveling in the high country this weekend in a press release, claiming that Berthoud pass on U.S. Highway 40 and Eisenhower and Vail Passes on Interstate 70 will be the most affected areas.

“Stranded motorists present additional challenges and dangers to our CDOT crews, law enforcement and the motorists themselves,” CSP said. “Communication systems can be compromised during major weather events making it even more difficult to identify a stranded motorist and begin rescuing them.”

The incoming snow storm already dropped nearly two feet on eastern California mountains, with up to 24 inches expected for the Park and Elkhead mountains in northern Colorado.

Drivers planning on heading west can download the COtrip Planner app for updates on conditions and road closures.