Friday 4 September Last update : 09/03/2015 at 17:01

Snow conditions

Avalanche Danger Scale

The European Avalanche Danger Scale contains five risk levels defined by a stability assessment and its consequences in terms of avalanche triggering probability.

None of the risk indices are negligible.


The flags are in place at the start and the finish of the main ski lifts and bulletins are available at the different points of information.

 

Avalanche Danger Scale Snowpack stability Flag
1/5
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 sluffs and small-sized natural avalanches are possible.
 
drapeau jaune
2/5
Moderate
The snowpack is only moderately well bonded on some steep slopes*, otherwise well bonded in general. Triggering is possible primarily from high additional loads**, particularly on the indicated steep slopes*. Large-sized natural avalanches are unlikely. drapeau jaune
3/5
Considerable
The snowpack is moderately to poorly bonded on many steep slopes*. Triggering is possible, even from low additional loads** particularly on the indicated steep slopes*. In some cases medium-sized, in isolated cases large-sized natural avalanches are possible.
 
drapeau à damier
4/5
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 medium-sized and often large-sized natural avalanches can be expected.
 
drapeau à damier
5/5
Very High
The snowpack is poorly bonded and largely unstable in general. Numerous large-sized and often very large-sized natural avalanches can be expected, even in moderately steep terrain. drapeau noir


* The avalanche-prone locations are described in greater detail in the avalanche bulletin (altitude, slope aspect, type of terrain)
moderately steep terrain: slopes shallower than 30 degrees
steep slope: slopes stepper than 30 degrees
very steep, extreme terrain: adverse 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 10m) keeping distances
high: two or more skiers / snowboarders etc. without good spacing (or without intervals); snowmachine; explosives; single hiker/climber

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