Bulletin d’avalanche

Kananaskis

Feb 16 – 17, 2016Alberta Parks
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Archivé · expiré 11 years ago

Danger d’avalanche

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

North winds have reversed the typical loading pattern and have made windslabs in unusual places. On top of this, cornice growth has changed the overhead exposure risk. Take a good look around before setting off.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    2–4
    Any open area at treeline and alpine elevations has the distinct wavy appearance that suggests widespread windloading. Expect slabs to exist well below ridgelines and avoid any large features.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–5
    Despite somewhat encouraging test results, we still don't trust this layer. Especially as the load increases (locally through windloading). This layer may cause large, unexpected avalanches. Large triggers should also be considered.

Confidence

High

Weather Forecast

We'll see a brief break in the winds tomorrow. They will average 20km/hr, but occasionally gust to 45. They are also expected to swing around to the SW overnight. The temp will be -1 in the alpine, with near zero temps expected valley bottom. The cloud cover will help limit the solar input.

Avalanche Summary

The south end of the Goat Range had 1 sz2.5 slab that released in the last 12 hours. 2500m, NE asp, initiated out of thin cliff bands and scrubbed to ground low in the start zone. Re-loading from the wind has essentially erased all evidence of yesterday's cycle.

Snowpack Summary

Wind is the story with our snowpack. Even below treeline has seen some wind affect in the last 24-36hrs. In many areas the crust has been blown clean and is back on the surface. In sheltered areas, expect the Feb 11th crust to be down 10-15cm. Treeline is either wind scoured or new, reverse loaded windslabs. There are still sheltered areas just below treeline with good snow, but the north winds have made them few and far between. In sheltered areas the feb 11th crust is down 20-30cm with new windslabs sitting on top. The alpine elevations have seen sustained north/northwest winds that have created widespread windslabs.

Régions couvertes