Storm Slabs
N
NE
E
SE
S
SW
W
NW
- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Possible - Likely
- Taille
- 1–3
Recent new snow has built up over a touchy layer of buried surface hoar crystals.
Bulletin d’avalanche
Voir sur la cartePurcells
Dec 21 – 22, 2014Avalanche Canada
Archivé · expiré 12 years ago
Danger d’avalanche
Tue
Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Points saillants
Have a safe and fun holiday.
Problèmes avalancheux
Deep Persistent Slabs
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Unlikely - Possible
- Taille
- 2–5
In some parts of the region, large avalanches have been failing on a deeply buried weak layer.
Confidence
Fair - Intensity of incoming weather systems is uncertain
Weather Forecast
On Monday, expect flurries or light snow with light to moderate NW winds. Freezing levels are expected to gradually drop to near valley floor by Tuesday. A second storm system is due to arrive some time on Tuesday, bringing snow (around 5-10cm).
Avalanche Summary
On Saturday, explosives triggered size 2-2.5 slabs at the northern end of the Purcells. These are suspected to have failed on the lower layer of surface hoar, and in isolated spots stepped down to the early November crust. Smaller slabs were also failing on the most recently buried layer of surface hoar. A size 2.5 naturally-triggered slab was observed at 2600m on an east aspect on Friday.
Snowpack Summary
Recent storm snow sits above two layers of surface hoar in the upper snowpack. The more recent of these sits on a crust below about 2100m, and on settled snow at higher elevations. A hard rain crust with facets from early November is buried over 1 m down and is still reactive to light loads in some locations.