DENVER (AP) — Forecasters say a big storm in the Rocky Mountain region could drop up to six inches of snow along the Front Range, home to 4.1 million of Colorado's 5 million residents.

The storm has already caused difficult driving conditions in western Colorado that prompted officials to close Colorado 65 over the 11,333-foot Grand Mesa near Grand Junction.

The storm could cause travel delays on major highways such as Interstate 40 in Arizona, Interstate 15 in Utah, Interstate 70 in Utah and Colorado and Interstate 25 in Colorado. Airport delays are also expected in Denver.

The National Weather Service says two-day snow totals of 3-8 inches are likely in southern Utah and northern Arizona. Mountains and ski areas in the three states will get more snow.

In Kansas, there is a threat of blizzard conditions for most western counties.