Denver may still be waiting for the first snow of the season, but Colorado’s mountains already have enough powder for skiers to cause avalanches, according to the Colorado Avalanche Information Center. Two skiers caused an avalanche at the Silverton Mountain ski resort on Sunday after the “first notable snowfall of the season,” agency officials wrote in a report. The skiers were skiing the north ridge near the “grassy run” when they saw cracking behind moving snow about halfway down.