Snow guns are lined up along the slopes of Colorado ski resorts, but Mother Nature pulled the trigger first this year. A sloppy, September storm slathered some of the state’s ski slopes with more than an inch of snow early Tuesday. At Winter Park Resort — which has plans to open as soon as conditions allow — the snow stake camera showed just shy of 4 inches of accumulation Tuesday afternoon. Subscribe at PostIndependent.com/newsletterPrime snow-making conditions begin at a “wet-bulb temperature” of 26 degrees, which takes humidity into account as well the temperature, Silverman said. Steamboat Resort saw a dusting of snow Tuesday, Sept. 23.