AVY Base

AVY Base

Avalanche bulletins

France, Norway, Switzerland, Austria, Sweden

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Updated 13.07.2026 18:42

European Avalanche Danger Scale

Official scale used by European avalanche warning services.

  • EAWS avalanche danger level 5

    5Very high

    Snowpack stability

    The snowpack is poorly bonded and largely unstable in general.

    Likelihood of triggering

    Numerous very large and often extremely large natural avalanches can be expected, even in moderately steep terrain.

  • EAWS avalanche danger level 4

    4High

    Snowpack stability

    The snowpack is poorly bonded on most steep slopes.

    Likelihood of triggering

    Triggering is likely, even from low additional loads, on many steep slopes. In some cases, numerous large and often very large natural avalanches can be expected.

  • EAWS avalanche danger level 3

    3Considerable

    Snowpack stability

    The snowpack is moderately to poorly bonded on many steep slopes.

    Likelihood of triggering

    Triggering is possible, even from low additional loads, particularly on the indicated steep slopes. In certain situations some large, and in isolated cases very large natural avalanches are possible.

  • EAWS avalanche danger level 2

    2Moderate

    Snowpack stability

    The snowpack is only moderately well bonded on some steep slopes; otherwise well bonded in general.

    Likelihood of triggering

    Triggering is possible, primarily from high additional loads, particularly on the indicated steep slopes. Very large natural avalanches are unlikely.

  • EAWS avalanche danger level 1

    1Low

    Snowpack stability

    The snowpack is well bonded and stable in general.

    Likelihood of triggering

    Triggering is generally possible only from high additional loads in isolated areas of very steep, extreme terrain. Only small and medium natural avalanches are possible.

Avalanche problems

Typical problem types defined by EAWS.

  • New snow

    New snow

    The avalanche problem is related to current or most recent snowfall. The amount of additional loading by new snow onto the existing snowpack is the crucial factor of the new snow problem. How critical the loading is, depends on various factors such as air temperature, wind or characteristics of the old snow surface.

  • Wind slab

    Wind slab

    Wind slabs are formed when loose snow in near-surface layers (new snow or old snow) is transported and deposited by wind.

  • Persistent weak layers

    Persistent weak layers

    The avalanche problem is related to the presence of one or more persistent weak layers in the old snowpack. These weak layers typically include faceted crystals, depth hoar or surface hoar crystals.

  • Wet snow

    Wet snow

    The avalanche problem is related to a weakening of the snowpack due to the presence of liquid water. Water infiltrates the snowpack due to melt or rain.

  • Gliding snow

    Gliding snow

    The entire snowpack is gliding on the ground, typically on smooth ground such as grassy slopes or smooth rock zones. High activity of glide-snow avalanches is typically related to a thick snowpack with no or only few weak layers. Glide-snow avalanches can occur both with a cold dry snowpack and with a warm moist or wet snowpack. The release of a glide-snow avalanche is difficult to predict, although in many cases glide cracks open prior to release.

  • Cornices

    Cornices

    A wave-like formation of soft or hard wind drifted snow, often overhanging.