How do climbers detect crevasses and avoid avalanches?

In mountaineering, managing the risks of crevasses and avalanches is essential for safety.

Detecting Crevasses

Crevasses are fissures in a glacier caused by stress from ice movement. While they are often visible, they can be particularly dangerous when concealed by a snow bridge—a layer of windblown snow that masks the opening. Climbers must remain vigilant in areas where glaciers are known to fracture, such as near valley walls or in steep icefalls, and often use rope teams and probing techniques to navigate these zones safely.12

Avoiding Avalanches

Avalanches are typically triggered when unstable snow on a slope breaks loose. To avoid them, climbers should:3
* Assess Terrain: Avoid slopes between 30 and 50 degrees, where slab avalanches are most common.3
* Monitor Conditions: Be wary of heavy snowfall, strong winds, and rapid temperature changes, which can destabilize the snowpack.3
* Identify Anchors: Seek out areas with dense tree cover or large rock outcroppings, which help anchor the snow in place.3
* Utilize Forecasting: Consult professional avalanche forecasts that analyze historical data, weather models, and current snowpack conditions.3