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Avalanche danger forecast for
Wednesday 4/24/2019


 

AVALANCHE DANGER  

Moderate/strong winds and heavy snowfall in the south-east above about 1800-2000 m.

Wednesday 4/24/2019
  


> 2000 m

The avalanche danger level is 3-considerable, rising to 4-strong for triggering in the valleys of Gressoney, Ayas, Champorcher and in the Gran Paradiso valleys; 2-moderate increase to 3-considerable on the rest of the regional territory. The increase in the danger level is due to the recovery of snowfalls from the morning with moderate to strong winds from the SE. The amounts of fresh snow will be abundant in the south-east and progressively less going towards the west.


Main avalanche problems: fresh snow and wind-drift snow


Natural avalanches
- In the Lys, Ayas, Champorcher Valleys and in the heads of the Gran Paradiso valleys: medium and large avalanches are possible at all exposures and even single avalanches that could reach the valley bottom. The significant quantities of fresh snow expected and the strong winds from the south-east will overload the north-facing avalanche basins, which, at high altitudes, still have a lot of snow on persistent weak layers. Therefore, any avalanches can erode the underlying old snow, taking on important dimensions.
- Sluffs and small avalanches of fresh snow from rocky bars or very steep slopes in the rest of the territory.


Triggered avalanches
In the areas most affected by snowfall, the triggering of soft wind slabs is likely when a skier/hiker passes over steep slopes, near the ridges and hills above the treeline. The possibility of triggering deeper slabs on extreme N slopes at high altitudes is rarer.




AVALANCHE DANGER TREND  Thursday 25:    Friday 26:  

Decreasing on Thursday and incresing on Friday for new snowfalls.


GENERAL CONDITION
updated to 4/23/2019
 

Fresh snow at 2000 m (data at 15:00)
20-30 cm in the Valleys of Gressoney, Ayas, Champorcher; 20 cm in the Gran Paradiso Valleys. 5-10 cm on the border with France and Switzerland, about 5 cm in the central valley.


Snow cover
Few snow or no snow up to 2000 m, good going up.

Snowpack
The refreezing is absent even up to 2500 m and scarce above this altitude. The moderate/strong south-east winds rework the new snow forming mainly accumulations on the northern slopes. In the northern slopes there is a potentially dangerous structure: a cohesive surface layer over a weak layer formed by faceted crystals or goblets, buried about 30 cm from the surface, which could be triggered by the weight of the new snow and the snow accumulated by the wind.

Avalanche activity reported in the last 24H: no avalanche reported.

Skiing conditions
In general not so good. In the areas affected by snowfall, wet and very wet snow is found up to 2500 m, dry above. Elsewhere spring snow in the steep south slopes, even up to 3200 m. Powdery fresh snow in some slopes in full north above 2800 m. Crusts, more or less thick, on the other slopes, hard on the west slopes up to 2800 m.


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° 147 issued on 4/23/2019 at 00:00 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