Lawinenlagebericht

South Rockies

Feb 13 – 14, 2015Avalanche Canada
Auf der Karte ansehen
Archiviert · abgelaufen 12 years ago

Lawinengefahr

Sun
Mon
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
Vollständige Karte öffnen

Kernpunkte

A Special Public Avalanche Warning is in effect for this region. The only worthwhile riding is likely on the least trustworthy slopes. Be circumspect on large steep alpine slopes.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–4
    Hard wind slabs may be stubborn to trigger, but they have a tenancy to propagate across entire slopes or pull into low angled terrain on ridge crests, catching people by surprise.

  • Cornices

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–3
    Cornices will likely become unstable with fluctuating temperatures. Not only are they a hazard in themselves, but they are also large triggers for deep slab avalanches on the slope below.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    3–5
    Persistent weaknesses recently woke up with the warm temperatures and should be treated with suspicion until after things freeze up again. Although likely to need a large trigger, the potential consequences are dire.

Weather Forecast

Saturday: Cloudy with possible light snow. The freezing level lowers to around 1500 m. Winds are generally light from the W-NW. Sunday: Mainly cloudy with light snow. The freezing level is around 1200-1500 m. Monday: A mix of sun and cloud, and mainly dry. Freezing levels in valley bottoms with light variable winds.

Avalanche Summary

Reports from Thursday include two cornice-triggered that stepped down to a deep persistent slab on a hanging face. A couple of explosive-triggered storm and and wind slabs up to Size 2 were also reported, but ski-cutting produced no results.

Confidence

Good

Snowpack Summary

Recent reports suggest 10-50 cm thick hard wind slabs lurk below ridge crests and behind terrain features at treeline and alpine elevations; however, these seem to be generally well-bonded. In more sheltered areas, variable amounts of previous storm snow is sitting on a crust that formed at the end of January. Recent warm temperatures have softened the upper snowpack, reawakening deep persistent weaknesses in isolated areas. As temperatures continue to fluctuate and stress the snowpack, expect an increased likelihood of triggering large destructive avalanches in isolated areas (e.g. thin spots) with heavy triggers (e.g. cornice falls, stuck sleds spinning tracks, or groups of people).

Abgedeckte Regionen