Boletín de aludes

Jasper

Avalanche Canada
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Peligro de aludes

Sun
Mon
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Desactualizado: este boletín caducó 5 months ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Intense sun and daytime warming will increase the hazard through the day. A poor overnight refreeze at treeline and below may require careful assessment even if starting trips early.

Problemas de aludes

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2.5

    With warm temperatures into the alpine and high solar radiation cornices may fail naturally.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1.5–3

    A persistent weak layer of facets is down 80–120 cm and may still be triggerable by humans in shallow areas, and by large loads like collapsing cornices or wet loose avalanches.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2

    Little overnight refreeze up to treeline elevations may increase wet loose avalanche activity.

Confidence

Moderate

  • We are uncertain due to variable freezing levels.
  • We are uncertain about how the timing or intensity of solar radiation will affect the snowpack.

Avalanche Summary

On Thursday field teams observed small wet loose avalanches at treeline and below treeline on solar aspects, as well as recent size one cornice failures that did not trigger slabs in the slopes below.

A size 3 persistent slab was observed on Sunwapta peak, occurring in the alpine and treeline on a West aspect.

Snowpack Summary

Moist surface snow into treeline elevations may see little refreeze Friday night. Up to 10cm of new snow has been redistributed by previous SW winds, and overlies a sun crust on solar aspects. A thicker melt-freeze crust is found down 20–40 cm at tree line and below. The Jan 24 persistent weak layer is 80–120 cm deep, and mainly a lingering concern in the alpine.

Weather Summary

Saturday

Cloudy with sunny periods and isolated showers.

Precipitation: Trace.

Alpine temperature: High 4 °C.

Ridge wind light to 15 km/h.

Freezing level: 2600 metres.

Sunday

Mainly cloudy with isolated flurries.

Precipitation: Trace.

Alpine temperature: Low -4 °C, High 1 °C.

Ridge wind light to 15 km/h.

Freezing level: 2200 metres.

Monday

Mainly cloudy with isolated flurries.

Precipitation: Trace.

Alpine temperature: Low -4 °C, High -1 °C.

Ridge wind southwest: 15 km/h gusting to 45 km/h.

Freezing level: 2100 metres.

Terrain and Travel Advice

  • Start your day early and be out of avalanche terrain during the heat of the day.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.
  • Travel early on sun-exposed slopes before cornices weaken with daytime warming.

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