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Avalanche danger forecast for
Monday 2/11/2019


 

AVALANCHE DANGER  

new accumulations on the N-E and S sides - still strong wind from the western quadrants and a bit of new snow


Monday 2/11/2019
  


> 2000

The avalanche danger is 4- strong from the Valgrisenche to the Gran S. Bernardo, 3-considerable in Valsavarenche, Rhêmes, Valpelline passing from Valtournenche to Ayas and Gressoney and 2-moderate elsewhere.

The avalanche problems are "wind  drifted snow" and "new snow".
We have different situations depending on the areas with an increase in the degree of danger from east to west due to the new snow accompanied by strong wind from the western sides.
Spontaneous avalanche
- Several small avalanches from very steep slopes and rocky bars;
- Medium-sized slab avalanches from leeward slopes. Locally, according to the morphology of the slopes, in the W sector, some of them will reach the valley floor in the habitual canals making a long way;
- Under the limit of the forest, the new snow settles on a damp snowy mantle, also in the cold slopes the internal structure of the snowpack is unfavorable - slab avalanches are likely to affect much of the thickness of the snowpack from the steep slopes.

Triggered avalanche
- new and recent accumulations, bigger and thicker in the N-NO of the Region, close to ridges and hills, near slope changes and in the basins above 2200 m. A hiker / skier can trigger of fairly compact and thick slabs, especially on the steep north, east and south slopes.

Critical areas are difficult to detect due to the bad weather and snowfall in progress.
weak persistent layers thick layers of cohesion-free crystals inside the snowpack. They are mainly located on the coldest slopes in the shade, in the altitude that starts from 1800 m up to 2600 m at the most. Rest the risk of a skier to solicit these weak layers and trigger slabs, even at a distance.

AVALANCHE DANGER TREND  Tuesday 12:    Wednesday 13:  

monday constant


GENERAL CONDITION
updated to 2/10/2019
  Many weak layers in the snowpack.

Snowcover
Good amounts of snow in the west and north-west of the region, elsewhere the snowcover is good only above 2200 m.
This afternoon we expect a snowfall above 900 m of altitude with moderate quantities in the sector more W of the territory, as you move from the W boundary the quantities decrease. The snowfall, even if less intense, continues also on Monday morning.

Snowpack
Wind slabs characterize the highest altitudes but also basins, valleys above 2200 m.
The cloud cover and the not too low temperatures have dampened the surface of the snowpack under the limit of the wood making it heavier.
From 1800 upwards and, where there is less snow, the strong gradient of the last month has formed a weak layer (faceted crystals, depth hoar, frost of embedded surface) on which many avalanches have slided in the last days.
Between. Currently remote trigger is less likely because the characteristics of the surface layers of the mantle have changed. With the snowfall expected, however, the conditions may worsen again.
The fairly high refreezing level of these last days has created a bit of melting crust on the steepest and sunniest slopes.

Avalanche activity

Today no warning of natural avalanche.

Skiing conditions
B
eautiful ski at low altitudes in N and in areas sheltered from the wind, elsewhere chalky snow, bearing wind crusts and not, crusts and melt crusts and refreeze in the South up to 2500 m.
The west of the region is well snow-covered; in the remaining territory you have to be careful because the fresh snow hides the previous lack of bottom under 1900-2300 m and in the humps: it is easy to touch rocks.
Useful rampant in the areas most exposed to winds that have brought to the surface the old very hard and smooth.

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° 75 issued on 2/10/2019 at 05:00 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