Avalanche danger forecast for Sunday 12/25/2016 Sunday 12/25/2016

Regione Autonoma Valle d'Aosta
Assessorato opere pubbliche, difesa del suolo e edilizia
residenziale pubblica
Dipartimento difesa del suolo e risorse idriche
Assetto idrogeologico dei bacini montani
Ufficio neve e valanghe
Région Autonome Vallée d'Aoste
Assessorat des ouvrages publics, de la protection des sols et du
logement public
Département de la protection des sols et des ressources hydriques
Aménagement hydrogéologique des bassins versants
Bureau neige et avalanches
Avalanche danger forecast for Sunday 12/25/2016
AVALANCHE DANGER
Windslabs at high altitude by NW winds
The avalanche danger level is 3-considerable in the valleys of Gressoney, Ayas and Champorcher, 2-moderate elsewhere.
Above 2000-2300 m the loose snow is light and easily transportable by the NW wind. In particular, in the areas bordering with
France and Switzerland and locally with Piedmont new wind accumulations could be triggered by the passage of a single skier; therefore they
must be locally evaluated, aboveall close to ridges and passes, on slope changes, near bumps and on the open slopes.
Natural avalanche activity : limited, single sluffs and small avalanches of recent loose snow, especially on steep sunny anc rocky slopes,
in the areas most affected by the last snowfall.
Avalanche danger trend for the next days: stationary, locally increasing the artificial triggering on the basis of the NW wind activity.
Sunday 12/25/2016
KEY
Critical slopes altitude and aspects
5
VERY HIGH
Hazard scale
4
HIGH
Rising avalanche danger during the day
3 CONSIDERABLE2 MODERATE 1
LOW
Snow and avalanche bulletin n° 31 issued on 12/24/2016 at 04.00 p.m.
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
Regione Autonoma Valle d'Aosta
Assessorato opere pubbliche, difesa del suolo e edilizia
residenziale pubblica
Dipartimento difesa del suolo e risorse idriche
Assetto idrogeologico dei bacini montani
Ufficio neve e valanghe
Région Autonome Vallée d'Aoste
Assessorat des ouvrages publics, de la protection des sols et du
logement public
Département de la protection des sols et des ressources hydriques
Aménagement hydrogéologique des bassins versants
Bureau neige et avalanches
GENERAL CONDITION
updated to 12/23/2016
Snow and weather
The snow cover is good all over the Valle d'Aosta territory, in particular above 1800-2000 m. It is possible to put on the ski from 1200-1400 m
(with the exception of the central axis of the Valley, at southern aspects, where the snow cover limit is higher). The snowfall of 19-20
December added powder snow on the good basal layer created by the November's snowfall. In the areas most affected by the last
precipitation (Gran Paradiso and south-eastern areas) it is common to break through the snow of about 30 cm with skis and up to 60-70 cm on
foot.
Small accumulations are present due to the SE wind on Tuesday, that has created slight snow waves and, locally, surface slabs, usually
triggerable with high overload.
The bond between the new snow and the old one is generally good. Just after the snowfall, surface loose snow avalanches and small surface
slabs have been observed on the steepest slopes and at the base of the rock bars, between 2500 and 2800 m, in particular on the northern
aspects.
Snow and avalanche bulletin n° 31 issued on 12/24/2016 at 04.00 p.m.
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