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AVALANCHE RISK BULLETIN
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AVALANCHE DANGER SCALE
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| Danger level | Simbol | Stability of the snow layer | Probability of avalanche triggering |
| 5 - Very high risk |  | The instability of the snow layer is generalized. | Even on the very slightly steep slopes numerous avalanches of large, often even very large dimensions can spontaneously be produced. |
| 4 - High risk |  | The snow layer is very little stabilized on most slopes*. | Avalanche triggering is likely even by a slight overload** on many slopes that are sufficiently inclined. In some situations, many spontaneous avalanches of medium and often large dimmensions are possible. |
| 3 - Considerable risk |  | On numerous inclined slopes*, the snow layer is medium or little stabilized. | Avalanche triggering is possible even with a light overload**, especially on the slopes described in the bulletin. In some situations spontaneous avalanches of medium and sometimes large dimmensions are possible. |
| 2 - Moderate risk |  | On some slopes sufficiently inclined*, the snow layer is medium stabilized; the rest is stable. | Avalanche triggering is possible especially at heavy overloads** and on some steep slopes described in the bulletin. Spontaneous avalanches of large dimmensions are not expected. |
| 1 - Low risk |  | The snow layer is generally stabilized on most slopes. | Avalanche triggering is possible only isolated on very steep slopes and in case of a heavy overloads**. Spontaneously only small snow flows or small avalanches may occur. |
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* Areas exposed to avalanche risk are described in the bulletin (altitude, slope orientation, land type):
• moderate steep slopes: with an angle under 30°
• inclined steep slopes: with an angle over 30°
• very inclined and dangerous slopes: generally with an angle over 40°, depending on the terrain configuration, the roughness of the soil; areas near mountain ridges.
** Overload:
• light: isolated skier / snowboarder descending smoothly without falling; tourist - without skis, on foot; a group that keeps the minimum distance of 10 m between the tourists
• heavy: two or more skiers / snowboarders who do not keep the safety distance between them; Snow groomers, snowmobiles; explosives
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THE MAIN MECHANISMS WHICH LEAD TO THE DEVELOPMENT OF AVALANCES
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Wind slab snow |
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Unstable layer of snow |
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Sliding the whole layer |
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Wet snow |
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Fresh snow |
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The boxes marked with gray represent the exposure of the slopes at risk |
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The information contained in this bulletin is the intellectual property of the NATIONAL METEOROLOGY ADMINISTRATION.
The total or partial reproduction of the bulletin is only allowed with the consent of the NATIONAL METEOROLOGY ADMINISTRATION
Contact: Regional Forecasting Service Sibiu, tel: 0269-235145, fax: 0269-235148, email: nivologiesibiu@gmail.com
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