![]() ![]() snowpack stability, and therefore the additional load required to trigger an avalanche, decreases.The avalanche danger does not increase in linear fashion from one level to another, but disproportionately. Danger levels – a simplified picture of reality These subdivisions indicate whether the danger is estimated to be towards the bottom end (-), more or less in the middle (=) or towards the top end (+) of the forecast level. When there is a moderate or higher danger of dry-snow avalanches (starting from level 2), the SLF subdivides the points on the European avalanche danger scale. The full description of the scale also includes other columns that have not been internationally agreed relating to typical characteristics, recommendations and consequences.Įuropean Danger Scale with recommendations and additions (.pdf) Subdivisions ![]() This scale, introduced by the European Avalanche Warning Services on winter 1993/94, defines the danger level based on the snowpack stability and the avalanche triggering probability. Travel extremely steep slopes one person at a time and be alert to the danger of falling.įorecast for around 20 % of the winter season.įull description of the European avalanche danger scale Avalanches can only be triggered in isolated cases, in particular on extremely steep slopes. Pay attention to unfavourable snowpack structure (persistent weak layers, old snow problem).įorecast for around 50 % of the winter season. Travel very steep slopes one person at a time. Routes should be selected carefully, especially on slopes with the aspect and elevation indicated in the avalanche bulletin. Relatively large natural avalanches are not to be expected. Avalanches can be triggered in particular on very steep slopes with the aspect and elevation indicated in the avalanche bulletin. Warning signs can occur in isolated cases. Unexperienced persons are advised to remain on open ski runs and trails.įorecast for around 30 % of the winter season. Avoid very steep slopes with the aspect and elevation indicated in the avalanche bulletin. Select best possible route and take action to reduce risks. The most critical situation for backcountry recreationists. Natural avalanches and remote triggering can occur. Avalanches can easily be triggered, particularly on steep slopes with the aspect and elevation indicated in the avalanche bulletin. Whumpf sounds and shooting cracks are typical. Unexperienced persons should remain on open ski runs and trails.įorecast only on a few days throughout the winter. Whumpf sounds and shooting cracks occur frequently. Avalanches can easily be triggered on many steep slopes. Natural and often very large avalanches are likely. You are advised not to engage in winter sports beyond open ski runs and trails. ![]() These can reach roads and settlements in the valley. Numerous very large and extremely large natural avalanches can be expected. Recommendations for backcountry recreationists Furthermore, the snowfall event must affect at least one whole massif local snow flurries caused for example by individual thunderstorm cells do not count towards this. Whether a bulletin is actually published also depends on the wind, the temperature and the spread and characteristics of the existing snowpack. These values are only intended as a guideline. The criteria for the publication of a summer avalanche bulletin are met if the forecast depth of fresh-fallen snow per precipitation occurrence (normally 1 – 3 days) reaches one of the following values: The translations (into French, Italian and English) will be available by 6:30 pm at the latest.They may cover a period of several days, running until 5 pm on the final day. As in this period the volume of on-site data available is less than in mid-winter, these are plain-text bulletins with no hazard maps and also generally no danger levels. From early summer until autumn, avalanche bulletins are published in case of heavy snowfall, and in late autumn at other times as well if the snow cover warrants it. ![]()
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