Poniedziałek, 06 lutego 2012

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Avalanche Danger Scale According EAWS
- European Avalanche Warning Services
Danger level Icon Snowpack stability Avalanche triggering probability Consequences for persons outside secured zones / recommendations
5.
Very high
gs4_5 The snowpack is poorly bonded and largely unstable in general. Numerous large-sized, in some cases very large-sized natural avalanches can be expected, even in moderately steep terrain. Highly unfavourable conditions. Avoid open terrain.
4.
High
gs4_5 The snowpack is poorly bonded on most steep slopes.1. Triggering is likely even from low additional loads2 on many steep slopes. In some cases, numerous medium-sized and often large-sized natural avalanches can be expected. Unfavourable conditions.Extensive experience in the assessment of avalanche danger is required. Remain in moderately steep terrain / heed avalanche run out zones.
3.
Considerable
gs4_5 The snowpack is moderately to poorly bonded on many steep slopes.1. Triggering is possible, even from low additional loads2 particularly on the indicated steep slopes. In some cases medium-sized, in isolated cases large-sized natural avalanches are possible. Partially unfavourable conditions.Experience in the assessment of avalanche danger is required. Steep slopes of indicated aspects and altitude zones should be avoided if possible.
2.
Moderate
gs4_5 The snowpack is only moderately well bonded on some steep slopes1, otherwise well bonded in general Triggering is possible primarily from high additional loads2, particularly on the indicated steep slopes. Large-sized natural avalanches are unlikely. Mostly favourable conditions. Careful route selection, especially on steep slopes of indicated aspects and altitude zones.
1.
Low
gs4_5 The snowpack is well bonded and stable in general. Triggering is generally possible only from high additional loads2in isolated areas of very steep, extreme terrain. Only sluffs and small-sized natural avalanches are possible. Generally safe conditions.

  • 1 The avalanche prone terrain is generally explained in greater detail in Avalanche Bulletin (e.g. altitude zone, aspect, type of terrain)
  • 2 Additional load:
    - high (e.g. group of skiers without spacing, snowmobile/groomer, avalanche blasting)
    - low (e.g. single skier, snowboarder, snowshoe hiker)
  • moderately steep terrain: slopes flatter than about 30 degrees
    steep slopes: slopes with an angle of more than about 30 degrees
    extreme slopes: those which are particularly unfavourable as regards slope angle (usually steeper than about 40°), terrain profile, proximity to ridge, roughness of underlying ground
  • natural: without human assistance
  • Aspect: the compass direction in which a downward slope faces
  • exposed: especially exposed to danger

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