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Avalanche danger forecast for
Friday 1/11/2019


 

AVALANCHE DANGER   New small windloads along the NW alpine divide
Friday 1/11/2019
  
 


> 2500 m

The danger is 2-moderate on the north-west borders of the region, 1-low elsewhere.
The main avalanche problem, even if limited, is the wind-drifted snow.

Artificial triggered avalanches
On Wednesday the weak perturbation from north passed through our region has been accompanied by strong northern winds whose effect has been mainly to blow the snow away: the new formed windloads are small, thick 20-40 cm, not widespread, well visible and located in areas strictly bordering with France and Switzerland (in particular in the areas of La Thuile and Gran San Bernardo), above 2500 m at different aspects. The bond between new and old snow seems to be good, however, on the very steep slopes, the passage of a skier could release a slab generally small sized, especially if it lay on an old smooth and hard surfaces enough wide.
On the rest of the territory there are old hard and thick accumulations: the main danger is to slip above them because they are extremely smooth.

Natural avalanches:
above 2500 m, especially in the north and west sectors of the region, loose snow sluffs from the extreme slopes and small slab avalanches from the very steep leeward slopes are possible.


AVALANCHE DANGER TREND  Saturday 12:    Sunday 13:  

Steady.


GENERAL CONDITION
updated to 1/10/2019
  In the NW areas strictly bordering with France and Switzerland,
20-30 cm of new snow above 2000 m, but in a very localized and irregular pattern

Fresh snow
On Wednesday morning, the perturbation from north passed through our Region has generally brought a few cm of snow above 1500 m, the only significant peaks were in the areas of La Thuile, Val Veny and Gran San Bernardo, where in the zones strictly bordering with France and Switzerland 20-30 cm of new snow were recorded above 2500 m, but in a very localized and irregular pattern. The weak snowfall was accompanied by strong northern winds.

Snowpack
Surface wind or melt and freeze crusts or, rarely, facets on the colder slopes and in sheltered plateau.
In the older part of the snowpack, where present, the weak layers are made by facets. It is unlikely to break them because they are often buried deep inside the snowpack and in any case the overlying crusts are very hard and thick. Locally the wind erosion may have brought facets closer to the surface.

Snow cover
Snow is absent in the bottomávalley and poor in the middle mountain.
Good snowcover above 2200-2400 m, but the snowpack has been heavily worked by the wind, with eroded areas where they are most exposed to the wind.

Natural avalanches in the last 24 hours
In theánorth-western border area of the region, one smallánatural slab have been reported on very steep slopes, above 3000 m at the southern aspects.

Skiing conditions: bad to good, frequently variable in few meters.
It is possible to wear the skis above 1800-2300 m, better to choose skitours with roads that lead at higher altitude.
Above 2000-2400 m, where it has snowed on Wednesday, we ski on dry and cold powder snow, or on very hardáwind crusts, while at lower altitudes there are refrozen crusts, hard and irregular.
There are many sastrugi, mainly at high altitude.

Useful crampons or rampant for the hardest areas.

Weather forecast

EUROPEAN AVALANCHE DANGER SCALE Rising avalanche danger during the day
 
5
VERY HIGH
 
4
HIGH
 
3
CONSIDERABLE
 
2
MODERATE
 
1
LOW

TYPICAL AVALANCHE PROBLEMS   CRITICAL LOCATIONS
NEW SNOW
WIND-DRIFTED SNOW
PERSISTENT WEAK
LAYERS
WET SNOW
GLIDING SNOW
IN BLACK: THE MORE CRITICAL ASPECTS AND ELEVATIONS
Snow and avalanche bulletin n░ 44 issued on 1/10/2019 at 45:00 p.m.
Valid outside the ski runs controlled and managed by the ski resorts.
For an accurate interpretation of the Bulletin, a specific guide is available at