Bulletin d’avalanche

Jasper

Jan 11 – 12, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Highway 93 will be closed from Parkers ridge to Saskatchewan crossing from 11am to 4pm for explosive control work. Moderate confidence of opening as depends on results. Polar Circus and Weeping Wall closed to climbers Friday.

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    30 cm of storm low density snow sits over unconsolidated facets mainly at lower elevations. Avalanches of this nature pick up enough mass to be a concern. 

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    30-50 cm thick soft wind slabs have formed on lee slopes with 30 cm of storm snow and moderate gusty variable alpine winds.

Weather Forecast

Friday: Sun and cold, no new snow. Saturday: Sun and cold, no new snow.Sunday: mixed clouds, no new snow.

Snowpack Summary

Up to 30 cm of low density storm snow fell on Wednesday.  Below tree line, it sits on a thin facetted snowpack. In sheltered tree line areas this new snow is sitting on a supportive mid-pack.  In wind exposed tree line and alpine areas, a 30-50 cm deep soft wind slab has formed on a variety of aspects and buried a surface hoar layer from Jan 6.  

Avalanche Summary

Thursday's explosive control on low elevation targets released several size 2 slabs and loose snow avalanches. Natural activity was limited. It appears wind still needs to firm up the snow into a slab. A few size 2 naturals were noted releasing out of steep rocky terrain. Some running a fair distance. They started in the storm snow.

Confidence

The weather pattern is stable

Régions couvertes