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Escala europea de Perill d'Allaus

Danger level

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Snowpack stability

Likelihood of triggering

5

Very high

The snowpack is poorly bonded and largely unstable in general.

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

4

High

The snowpack is poorly bonded on most steep slopes*.

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.

3

Considerable

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

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

2

Moderate

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

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

1

Low

The snowpack is well bonded and stable in general.

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.

(*) The avalanche-prone location are described in greater detail in the avalanche bulletin (altitude, slope aspect, type of terrain):
• Moderately steep terain: slopes shallower than about 30 degrees.
• Steep slopes: slopes steeper than about 30 degrees.
• Very steep, extreme terrain: particulary adverse terrain related to slope angle (more than 40 degrees), terrain profile, proximity to ridge, smoothness of underlying ground surface.

(**) Additional loads:
• Low: individual skier / snowboarder, riding softly, not falling; snowshoer; group with good spacing (minimum 10 m) keeping distances.
• High: two or more skiers / snowboarders etc. without good spacing (or without intervals); snowmachine; explosives.

Natural: without human influence.