On 19 January 2024, Slovenia was hit by heavy snowfall, which was most pronounced in the mountains, where the amount of new snowfall further weakens the snow cover. There was up to 40 cm of new snow. Strong northerly winds carried the snow and built up slabs and drifts. The low temperatures will slow down the transformation of the snow. This makes conditions challenging and unpredictable, and as such may persist for a prolonged period.

Video: Heavy snowfall in the mountains has increased the risk of avalanches.

A critical amount of new snowfall can be as little as 10 to 20 cm of new snow cover. Snow usually takes a few days to transform, and rounding depends on the temperature. The lower the temperature, the slower the snow transformation, and sudden rapid thaws are also very dangerous. Even slopes with a steepness of only 15 degrees can be dangerous.

Slab avalanches caused by wind-blown snow accumulation also pose a danger. Under hard and dense snow slabs, there is usually a weaker layer of snow. A slab avalanche can occur naturally or be triggered by a skier or hiker. This was most recently the case in early January, when an avalanche in the eastern ravine of Tošca swept away three climbers. Two climbers were injured and part of their protective equipment was destroyed.

In 90% of cases, the avalanche is triggered by a hiker or backcountry skier. Rescue is very difficult and risky.

In avalanche-prone areas, snow cover stability tests should be carried out and the "avalanche trio" (beacon, shovel, probe) and protective equipment should be used. Anyone going to the mountains in winter should be well prepared, informed and equipped.

Unstable and dangerous conditions can persist for long periods of time.

Related content

Helpful Advice to all Hikers, Trekkers and Mountaineers