Bulletin d’avalanche

Jasper

Jan 10 – 11, 2015Parks Canada
Voir sur la carte
Archivé · expiré 12 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

Keep your head up folks. Rapid variations in temperature and solar effect is waking up a touchy storm slab.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Recent storm snow has settled into a soft slab which overlies a weak layer of facets and surface hoar. Temperature fluctuations and direct solar radiation may well lead to an increased likelihood of avalanches.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    This weak layer exists below a variable mid-pack at treeline and sub-alpine elevations. Large loads such as a cornice collapse or surface slides could still possibly trigger this deep persistent weakness.

Weather Forecast

Steady as she goes! No expected dramatic changes in the weather. Mainly overcast skies and light snow expected over the day Saturday.

Snowpack Summary

Overall, as we continue to explore areas outside the normally accessed skiing, field teams are finding a weak snowpack. The Dec 20 facet/surface hoar layer is out there. It is proving to be very sensitive to fluctuations in temp and solar radiation and is showing exceptional propagating properties for having only a weak soft storm slab over it.

Avalanche Summary

An avalanche cycle is being reported from field teams with multiple slides, up to sz 3 on south to westerly (solar) aspects over the last 2 days. A dramatic temperature inversion at around 2500ms (cold air low/warm above) is affecting the slopes and seems to have enough punch to initiate the natural activity.

Confidence

Timing or intensity of solar radiation is uncertain

Régions couvertes