Bollettino valanghe

South Rockies

Feb 21 – 22, 2015Avalanche Canada
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Archiviato · scaduto 12 years ago

Pericolo valanghe

Mon
Tue
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole

In sintesi

Watch for fresh isolated pockets of windslab on reverse loaded features.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–2
    Thin, fresh pockets of  windslab may be found in reverse loaded lee features.
  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–5
    Large avalanches are unlikely in most places but may be possible in the high alpine where a large trigger in a thin rocky spot could cause an avalanche on a buried persistent week layer.

Confidence

Good - The weather pattern is stable

Weather Forecast

Were looking at a couple of nice days. Freezing levels will climb during the day but are forecast to return to valley bottom overnight. Sunday will see high of -5C in the Alpine with light westerly winds. Monday will have a high of 0C and light northwesterly winds with increasing clouds in the afternoon. Tuesday will be much the same. No new precipitation is expected through the forecast period.

Avalanche Summary

No new avalanches have been reported recently

Snowpack Summary

Up to 10 cm of new snow may now cover a thick, solid crust that extents up to 2100m and firm wind pressed surface higher than that. The recent winds have been light to moderate from the northeast and I suspect that you may find isolated fresh windslabs forming in reverse loaded lee features on southern aspects. Below 2100m the crust is effectively capping the snowpack and protecting a couple of buried persistent week layers. Two layers of surface hoar can be found between around 50 and 80cm down. Recent snow pack test indicate that these layers are unlikely to fail but could propagate widely if they do. I suspect that at upper elevations where these layers are not protected by the surface crust it could still be possible to trigger an avalanche from a thin or rocky spot. The mid-December crust is becoming harder to find but where it does exist (mainly at treeline elevations) it is over a meter down.

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