Snow and avalanche bulletin n° 43
issued on 3/4/2015 at 00:00 p.m.
 

valid 72 hours out of controlled and open ski runs
Next update on 03/06/2015

GENERAL CONDITION  
  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 h 07:00
2000 m 2500 m 2000 m 2000 m Shady Sunny
A - Central Valle d’Aosta 60-130 110-130 0 -3 3/3/2015
moderate from W
3/2/2015
valley floor 1800-2000
B - Gressoney, Ayas, Champorcher Valleys 50-160 140-230 0 -3 3/3/2015
moderate from W
3/2/2015
valley floor 800-1000
C - Rhêmes, Valsavarenche, Cogne Valleys 60-100 80-130 0 -3 3/3/2015
moderate from W
3/2/2015
valley floor 800-1000
D - Alpine ridge 40-140 60-230 0-5 -3 3/3/2015
moderate/strong from W-N
3/4/2015
valley floor valley floor
Over the past two days there has been a strong avalanche activity on the alpine ridge and in the valleys of the Gran Paradiso. The peak of avalanche activity, which followed the last snowfall reflects the criticities in the surface and in basal layers of the snowpack. Plus in these days, we have new wind accumulations at all aspects, sensitive to light overload. Although the slopes have been partially downloaded, you must be careful, especially at high altitudes, above 2300-2500 m where you have the most critical conditions and a lot of snow, as if you trigger the basal layers, which can happen in transit zones between much and little snow, you might cause medium/big size avalanches. In fact, over the 2300- 2500 m, there are also old slabs partially covered by the recent snow, which can be triggered by a high overload.
Under 2200 m it's less dangerous and small slabs gliding on melt-freeze or rain crusts may occur.
The snow quality in general is not great: crusts rain or melt and freeze up to about 2400 m on the southern slopes, up to 2200 on the N slopes. Above this level you have wind hard crusts and loose snow on the slopes sheltered from the wind.
Overall it's hard to understand the stability of a slope and, therefore, is certainly prudent to keep the safety distances and evaluate carefully the transit on large open slopes, because a possible avalanche could have serious consequences. The danger level is 3-considerable from the Val di Rhêmes to Valtournenche and 2-moderate in the rest of the region.
Weather forecast Show map
FORECAST   New windslabs from N-NW winds above 2000-2200 m!
Thursday 3/5/2015
In the next days we'll have sunny skies, a drop in temperatures and strong N winds. Below 2200 m we'll have a gradual consolidation of the snowpack due to sunny skies and falling temperatures, while approximately above 2200 m new accumulations especially on the southern slopes near ridges, hills, canyons, elevation changes but also on open slopes, where the weak overload will be enough to trigger them. Possible some big ground avalanche. Read also the critical features described in the current situation.
Despite the natural avalanche activity will be limited, ice-climbers are recommended to evaluate carefully the slopes as gullies are snow loaded by the wind. The danger level is 3-considerable from the Val di Rhêmes to the head of the Valley of Gressoney and 2-moderate elsewhere.
Friday 3/6/2015
Saturday 3/7/2015
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