Snow and avalanche bulletin n° 11 issued on 12/24/2014 at 00:00 p.m. 

valid 72 hours out of controlled and open ski runs
Next update on 12/26/2014

GENERAL CONDITION   Still wind from W. Hard slabs mainly along the border ridge
  Snow height [ cm ] Ta
[°C]
Last
snowdrift event
Last snowfall Continuous snowcover above
[m a.s.l.]
Ground level New
h 07:00 h 07:00 h 48 h 07:00
2000 m 2500 m 2000 m 2000 m Shady Sunny
A - Central Valle d’Aosta 20-70 50-75 0 +3 12/24/2014
moderate/strong from W
12/17/2014
2000-2200 2300-2500
B - Gressoney, Ayas, Champorcher Valleys 10-75 70-150 0 +2 12/24/2014
moderate/strong from W
12/17/2014
2000-2200 2100-2400
C - Rhêmes, Valsavarenche, Cogne Valleys 10-45 60-100 0 +3 12/24/2014
moderate/strong from W
12/17/2014
2000-2200 2100-2400
D - Alpine ridge 0-45 40-110 0 +2 12/24/2014
moderate/strong from W
12/17/2014
2000-2200 2100-2400
The most critical issue is currently located above 2700 m, mainly along the alpine ridge bordering with France and Switzerland (from La Thuile towards the top of the Lys Valley) at all aspects, where there are two types of hard slabs, detachable also at the passage of a single skier: the smaller ones even at a distance, while the large ones are characterized by high speed of propagation and can involve large slopes in case of a release. They are mostly present in the concavities and close to passes, areas the most traveled by skiers. The persistence since several days of mild temperatures (positive up to 3000 m during the day) and the lack of cloud cover at night, have also favored the formation of melt-and-freeze, which act as sliding surface for the overlying layers formed by the wind action.
Close to passes and slope changes the wind - which blew strong westerly - has further compacted the snow, while in the gullies and basins residual wind accumulations are present. Only above 2500 m it is possible to find loose snow in areas sheltered from the an alternation of hard and thin crusts.
The avalanche hazard is 3-considerable along the border ridge from La Thuile towards the top of the Lys Valley, 2-moderate on the rest of the Region.
Weather forecast Show map
FORECAST   Drop in temperature. Possible weak snowfall on Saturday
Thursday 12/25/2014
The expected drop in temperatures since the evening of Wednesday and the winds forecast for Christmas and St. Stephen will not substantially change the conditions of the snow cover, keeping the problems already identified in the current situation.
Thursday and Friday the avalanche danger level will remain 3-considerable along the border ridge from La Thuile to the top of the Lys Valley, 2-moderate on the rest of the Region.
Saturday a perturbation will bring light precipitation accompanied by winds. However, although the amounts of fresh snow will not be high, if more than 10-15 cm, they may cover the areas with criticities already identified in the current situation, making them less visible. The avalanche hazard will be 3-considerable on the whole Region, depending on the intensity of the snowfall.
Friday 12/26/2014
Saturday 12/27/2014
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
Answering service: snow and avalanche Bulletin +39 0165 776300 - Weather Bulletin +39 0165 272333
For an accurate interpretation of the Bulletin, a specific guide is available at www.aineva.it/guida.html