On Saturday, December 6, three skiers near Butler Gulch, Colorado, were caught and partially buried by an avalanche triggered by another party upslope. The avalanche, which started small, was remotely triggered by a skier travelling across a slope connected to the steeper terrain above, according to the Colorado Avalanche Information Center. As the initial slide began to move, it stepped down, leading to an avalanche that spanned the entire slope, with a crown about 200-300 feet wide, and broke down to the bed surface below. The avalanche slid for about 1,500 feet, including over two flat areas of terrain, carrying the three skiers ascending below and partially burying them.
The first group quickly confirmed the skiers below were uninjured before both parties skied out together under their own power. Despite the good outcome, the incident highlights the complexities the snowpack can hold, even in the early season. Colorado in particular is known for its dynamic and often significant avalanche danger. Considered a continental snowpack, Colorado frequently holds one of the more intimidating avalanche problems buried beneath its layers of pristine snow—persistent slab avalanches. These persistent slab problems are much more likely to be remotely triggered, like the avalanche from Butler Gulch, and can fracture deep below the surface, as they tend to stay present as storm after storm deposits more snow on top, waiting for the right trigger to release.
On the day in question, the Colorado Avalanche Information Center had issued an avalanche warning for many slopes in the area due to a powerful storm moving through the Rockies. The forecast for the day identified persistent slab problems on North through East facing slopes, as well as wind slab problems on leeward terrain features. The avalanche occurred on a North facing slope, an aspect that the forecast discussion identified as likely having weak, faceted layers of snow near the ground.
With recent storms bringing the ski season into full swing, more and more people will be recreating in the backcountry on a regular basis. Observations like this report submitted to the Colorado Avalanche Information Center work in conjunction with daily avalanche forecasts to give users a better understanding of the current snowpack and the hidden dangers that may lurk below. As more snow lines up for the Rockies and more avalanche watches get issued across areas of Colorado, there is no better time than now to attune yourself to the daily forecast to help manage risk and make informed decisions in the backcountry.
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