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Avalanche danger forecast for
Thursday 2/23/2017


AVALANCHE DANGER   Be careful steep, large and homogeneous slopes, not skied before, in the shadow aspects
Thursday 2/23/2017
The avalanche danger is 2-moderate on most of the region, 1-low in the central and eastern valley floor. The greatest danger is given by persistent weak layers and, minimally, by the wind-drifted snow.
Triggering avalanche release:
1 - persistent weak layers: more skiers may surcharge the inner weak layers and triggering slabs, even thick (low probability of release, but, in case, with considerable consequences). The danger points are few, but hardly recognizable even by the expert. The suspects slopes, to be carefully evaluated, are the steep slopes, wide and homogeneous, colder aspects (NW, N and E) between 2400 and 2900 m, little skied earlier during winter.
2 - wind-drifted snow: above 2600-2900 m there are soft or hard wind loads, small sized (up to 20-30 cm of thickness), built up by the moderate/strong winds from NW, more susceptible to overload in the central hours. They are mainly found at the E, SE, S aspects and are easy to see and avoid.

Natural avalanche release: possible some snow avalanches and slabs, even full-depth, on the steep slopes below 2700-2900 m, mainly at the sunniest aspects, during the hottest hours, near rocky bars or on very steep grassy slopes..
Avalanche danger trend: steady.
KEY Critical slopes altitude and aspects Rising avalanche danger during the day
Hazard scale
5
VERY HIGH
4
HIGH
3
CONSIDERABLE
2
MODERATE
1
LOW

GENERAL CONDITION
updated to 2/22/2017
 
Snow and ski conditions. The temperature rise of the last two days has moistened and settled the snow up to 2200-2500 m. The snow cover is coming down, especially in the mid-mountain and the sunny slopes where it was already poor before.
Above 2800-2900 m the snow is very worked by the wind which is currently moderate to strong from the northwest; There are alternately hard and discontinuous crusts, bumps eroded and exposed stones.
Between 2400 and 2800 m on the less sunny slopes there are 20-40 cm of loose snow that locally is beginning to form a thin-freeze crust. On the steep southern slopes is hard crust that, during the hottest hours, it humidifies and allows skiing on a great firn. Remains in this altitudinal range a good skiing conditions even if you can find sometimes to the eastern and western aspects crusts hard to ski.
Under the 2300-2400 m spread and thick crusts; intermediate layers are humidifying, while good night refreezing surface layers which are soft during the hottest hours of the day. Classic itineraries have many old ski tracks, hardened and that disturb the skiing.
At high altitude, on the shady slopes, the inner layers of the snowpack are still weak, formed by faceted crystals or depth hoar. The thickness from 10 to 50 cm and are located under 20-40 cm from the surface. Increasing temperatures improves the bonds between single crystals and so also the stability of the snowpack.
Weather forecast
Snow and avalanche bulletin n° 91 issued on 2/22/2017 at 00:00 p.m.
Snow and avalanche Bulletin: +39 0165 776300
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