Bollettino valanghe

Jasper

Jan 6 – 7, 2014Parks Canada
Vedi sulla mappa
Archiviato · scaduto 13 years ago

Pericolo valanghe

Mon
Tue
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Careful snowpack evaluation and conservative decision-making is essential right now as the  lingering deep instability will be with us for the foreseeable future.  Significant temperature change is expected in the next 24 hours.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–3
    Recent storm snow and strong winds in the alpine are forming new windslabs at upper elevations.

  • Loose Dry

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    There is lots of new snow plastered to steep rock and ice terrain. With the expected warming trend (and solar effect) over the next week, expect this terrain to shed this snow.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    2–4
    Storm snow and wind have overloaded the weak basal layers in several places and caused numerous large natural avalanches in the alpine. Cornice fall, smaller slides, and skiers in shallow areas all have the ability to trigger deeper instabilities.

Weather Forecast

Temperatures warming to reach a maximum of -5C in the Columbia Icefield area by midweek accompanied by light Southwesterly winds.  Potential for significant snowfall by the end of the week, starting on Wednesday and increasing in intensity towards the weekend. 

Snowpack Summary

Up to 30cm of low density storm snow is settling and overlies existing wind slabs which in places has a very weak faceted basal layer. Below tree line the snow pack has very little support except in isolated open areas where wind slabs may exist. New windslabs have formed at upper elevations but lots of snow is still available for transport.

Avalanche Summary

Road patrols in the South end of the forecast area observed numerous size 3 slabs that failed on the basal facets and widespread smaller avalanches to size 2 on all aspects in the alpine involving windslabs and loose dry avalanches.  With recent storm snow plastered to steep terrain, natural loose dry activity is expected with warming temps.

Confidence

Regioni coperte