Bulletin d’avalanche

Kananaskis

Nov 19 – 20, 2020Avalanche Canada
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Archivé · expiré 6 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

15-25cm of snow over the past few days is adding load to the November crust down 30-50cm. This and new windslabs due to moderate variable winds are giving us a complex early season snowpack.  

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2

    Watch for windslabs in alpine areas in the upper snowpack. Gullies and ridgelines are common areas to find these issues. 

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2.5

    A weak facet layer overlying the November crust is producing moderate results down 30-60cm. This will be a problem for some time. Moderate sudden planar results are benig observed on this layer indicating that it is within the range of human triggerring.

Confidence

Moderate -

Weather Forecast

Steady light snowfalls will continue over the next few days but accumulations will be minimal. Temperatures will be more seasonal around -10C over the next few days with winds continuing in the moderate range mainly out of the SW.

Avalanche Summary

No new slab avalanche activity but a few loose dry avalanche out of steep terrain up to sz 1.5 were observed. 

Snowpack Summary

20-25cm of snow has fallen over the past 48hrs with variable winds at the upper elevations. WIndslabs in the upper snowpack are evident in alpine areas and there is also a layer of weak facets overlying the November rain crust that is producing moderate sudden planar failures down 30-40cm. Thin areas persist where triggerring the facets overlying the november crust may be easier and also the chance of clipping a rock or tree at lower elevations are very real as its still pretty thin. The crust is being found up to 2550m and is carrying a skeirs weight well. 

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • Approach lee and cross-loaded slopes with caution.
  • Closely monitor how the new snow is bonding to the crust.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Régions couvertes