Updated 4:20 p.m. with road conditions update.

The westbound lanes of Interstate 70 were opened from Colby shortly after 4 p.m. Tuesday. The Kansas Department of Transportation advises motorists to use caution when traveling, however.

West of a line generally from Norton to Oakley to Scott City, KDOT reports roads are partially covered, with some highways farther west toward Goodland reported as completely covered.

A blizzard warning is in effect for Sherman and Cheyenne counties until 5 p.m. Mountain Standard Time Tuesday. The warning extends into southwest Nebraska and eastern Colorado.

Snowfall rates are expected to be in excess of an inch an hour for that area, with wind gusts this afternoon up to 50 mph, creating whiteout conditions.

Farther east — including Hays — a winter weather advisory is in effect until 9 p.m. Tuesday with total snow of 1 to 3 inches and gusts to 50 mph.

Trooper Tod Hileman, public information officer for the Kansas Highway Patrol, reported Tuesday morning slide-offs were occurring on I-70 in Russell County.

For the latest driving conditions, check kandrive.org.