Lawinenlagebericht

Jasper

Apr 19 – 20, 2023Avalanche Canada
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Archiviert · abgelaufen 3 years ago

Lawinengefahr

Fri
Sat
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
Keine Stufe
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Kernpunkte

Use caution in areas where snow depth changes rapidly. You are more likely to trigger one of the persistent weak layers in this type of terrain.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2

    The winds have become light but wind slabs from earlier this week could still produce avalanches if triggered.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1.5–3

    Several persistent weak layers in the midpack can be found as facets on polar aspects and sun crusts on solar aspects.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–4

    The bottom of the snowpack is inherently weak with well-developed Facets and Depth Hoar.

Confidence

Moderate

Avalanche Summary

On Tuesday several small wind slabs in the alpine were observed. Also one large avalanche stepping down to ground from a falling cornice occurred on Big Bend Peak.

Don't forget to post avalanche observations to the MIN.

Snowpack Summary

Around 13cm of new snow this week sits on crusts on solar aspects, a melt freeze crust below tree line and old wind slab in exposed alpine

Below tree line is in a daily melt-freeze cycle. At tree line the mid-pack consists of multiple layers of sun crusts or facets. Depth hoar and basal facets at the base.

Weather Summary

Thursday

A mix of sun and cloud.

Alpine temperature: High -3 °C.

Ridge wind light to 20 km/h.

Freezing level: 1900m

Friday

A mix of sun and cloud with isolated flurries.

Precipitation: Trace.

Alpine temperature: Low -7 °C, High -2 °C.

Ridge wind light to 15 km/h.

Freezing level: 1900m

Look for weather products and tutorials at Avalanche Canada

Terrain and Travel Advice

  • Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.

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