National Weather Service meteorologists expect a strong Pacific storm that started to move into Southwest Colorado on Friday will leave up to 8 inches of snow in the lowlands and 1 to 2 feet in higher elevations by tonight.
A winter weather advisory is in effect from 6 a.m. today to midnight Sunday.
The chance for snow is 90 percent today and tonight, dropping to 80 percent Sunday and 70 percent Sunday night. The chance for snow Monday is 40 percent.
Clearing should begin Monday evening.
Beginning today, high temperatures are expected to hover around freezing or just slightly above while lows will be in the neighborhood of 5 to minus 3. The chill is expected to extend through the week.
National Weather Service forecasts can be monitored online at www.weather.gov/gjt. Road and weather conditions also are available by dialing 511 or visiting www.cotrip.org.
Colorado Department of Transportation crews are preparing for around-the-clock work on Wolf Creek, Coal Bank, Molas, Red Mountain and Lizard Head passes, agency spokeswoman Nancy Shanks said Friday.
Alternating freezing and thawing has loosened roadside rock formations, Shanks said.
She cautioned motorists to be alert.
Avalanche danger is relatively low because of mitigation work on slide paths done during the last storm, Shanks said.
She said total snowfall is expected to reach up to 2 feet on the passes.