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Avalanche danger forecast for
Monday 2/18/2019



AVALANCHE DANGER  

Avalanche activity possible mainly during the hottest hours of the day

Monday 2/18/2019
  


2000-2800 m

The avalanche danger is 2-moderate in the north and in the west of the Region and in Gran Paradiso valleys, 1-low elsewhere.

The avalanche problems are: "persistent weak layers” and "wet snow".

Persistent weak layers
Still possible isolated slab avalanches, of medium size, caused by a low overload by a hiker/skier, where the accumulation lays on persistent weak layers: mostly just above the treeline, on the less sunny aspects, in correspondence of slope changes and ridges and bumps.

Wet snow
The diurnal heating in act, through the humidification and the weighting of the superficial layers of the snowpack, can lead to the release of small and medium avalanches of wet loose snow, mostly from the very steep sunny slopes, mainly from the base of rocky bars, between 2000 and 2800 m, above all in the central and afternoon hours of the day.

Still pay attention and always keep safe distances when it is necessary to cross an evident windslabs, mainly close to bumps, ridges and slope changes, at all aspects. It is important to well plan the timing in order to avoid the hottest hours.


AVALANCHE DANGER TREND  Tuesday 19:    Wednesday 20:  

Gradually decreasing thanks to the slight drop in temperatures and to the clear nights favoring a good night refreezing.


GENERAL CONDITION
updated to 2/17/2019
 

Snowpack
In the old snowpack there are always weak layers (facets and striated crystals, deep and surface hoar) interspersed with old melt-and-freeze and wind crusts: they are a latent instability between 2000 and 2800 m, at all the aspects.
However the rise in temperatures in progress, accompanied by a good night temperature refreezing, leads to a gradual improvement in the snowpack stability, going to slowly deactivate the persistent weak layers, at least at the southern aspects.
The surface humidification at the moment concerns the sunniest aspects and partially those in the shady locations at lower altitudes.

Avalanche activity last 48 hours
On Friday two triggering medium sized slabs (40 cm thick) has been surveyed at 2100-2200 m, NE aspect, close to slope/ridge changes.
Small avalanches of loose wet snow from the sunny steep slopes, in correspondence of rock bands below 2800 m. Some glide-snow avalanches from the steep grassy slopes.

Snowcover 
Discrete amounts of snow in the west and north of the region, even if well below the average for the season; elsewhere the snowcover is enough only above 2200 m.
In general, ridges, passes and several bumps are eroded to the ground or to the old hard snow.

Skiing conditions
In the west and north of the Region skiing conditions still discrete to good, especially in the areas more sheltered and shady: still powder snow or lightly hardened by the wind.
On the steep sunny slopes we have almost spring conditions, with superficial wet snow and melt-and-freeze crusts already up to 2600-2800 m, sometimes already unbreakable.
Towards the south-east of the Region the snow is strongly compacted by the wind and it is possible to touch stones, on the bumps and below 1900-2300 m.
Generally in correspondence of ridges and passes, hard snow, old or very compacted by the wind: necessary the rampant.

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° 82 issued on 2/17/2019 at 15:00 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