A Snow Squall Warning was effect until 10:30 a.m. Tuesday for I-225, I-70, I-25, I-270 near Aurora, I-76 near Lochbuie, I-25 and US-287 near Longmont, and US-85 near Fort Lupton. The greatest travel impacts from this storm system will be in the mountains west of Denver. The National Weather Service has issued a Winter Storm Warning and Avalanche Warning for portions of the mountains, especially areas above 9,000 feet. Snow and blowing snow are likely with 6 to 12 inches of accumulation. Heavy snow is expected in the San Juan Mountains of southwest Colorado with total snow accumulations of 1 to 2 feet and winds gusting as high as 65 mph.