Between 6-14 inches of snow could accumulate between midnight Friday and midnight Saturday as a storm system nears Colorado’s mountains.

Travel could be “very difficult” due to the mix of heavy snowfall and winds associated with the system, according to a winter weather advisory issued by the National Weather Service.

Winter weather advisories are in effect in portions of Summit, Grand, Eagle, Routt, Pitkin, Garfield, Park, Clear Creek and Lake counties, though snow totals vary by elevation and region.

The storm comes after a stormy week in the mountains that brought more than a half-foot to most areas. The snow is expected to push snowpack levels higher across the state, which is lagging behind the 30-year median despite some areas in the northern and central mountains that are above normal.

“The latest models continue to favor the northern and central mountains with 4-10 inches of accumulation and just a dusting to 2 inches should fall over the northern part of the southern mountains (Telluride, Silverton),” OpenSnow founder and lead meteorologist Joel Gratz wrote in his daily blog.

Due to the wind direction and temperatures, Gratz said mountains at lower elevations that are west of the Continental Divide often receive less snow than the forecast, like slopes near Vail, Beaver Creek, Aspen and Steamboat. He said areas near the Continental Divide — like Breckenridge, Copper Mountain, Arapahoe Basin, Keystone, Winter Park, Eldora and Loveland — receive more snow.

Snow is expected to taper off Sunday, leading to a dry and warm period.

Some weather models are showing a potential for snow to return next weekend in Colorado’s mountains, but details are limited at this time.