Bollettino valanghe

Kootenay Boundary

Dec 29 – 30, 2014Avalanche Canada
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Archiviato · scaduto 12 years ago

Pericolo valanghe

Wed
Thu
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato

In sintesi

Check out the Tricky Holiday Conditions blog post for more details on the current avalanche scenario.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–3
    Strong northerly winds have shifted loose surface snow into stiff wind slabs. Due to the reverse loading pattern, wind slabs may be found in unsuspecting locations.
  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–4
    A persistent weak layer, buried up to 90cm below the surface, was responsible for a few close calls over the past week. The key to safe backcountry travel is in conservative terrain selection.

Confidence

Good

Weather Forecast

The dry ridge of high pressure will persist bringing mainly clear skies for the entire forecast period. Ridgetop temperatures should hover around -20 for each day, while ridge top winds will be mainly moderate from the northwest.

Avalanche Summary

We continue to get reports of skier-triggered, and remotely triggered slab avalanches. Avalanche activity has mostly been in the size 2 range, failing on the mid-December layers. With the current reverse loading pattern, I would expect a new round of wind slab activity on southeast through southwest facing terrain.

Snowpack Summary

Up to 35cm of low density snow fell over the last few days. This new snow, which overlies recently formed surface hoar, has likely been shifted by strong northerly winds into stiff and reactive wind slabs on south-facing terrain. Up to 90 cm below the surface, you'll likely find a touchy weak layer of surface hoar sitting on a thick rain crust. This buried snowpack structure was formed in mid-December and remains the primary layer of concern for the region. This widespread persistent weak layer continues to produce whumpfing and sudden snowpack tests, and will likely remain sensitive to human triggering for the foreseeable future. Although high elevation slopes may not have the rain crust, they are still reported to have touchy buried surface hoar. At the base of the snowpack, a crust/facet combo appears to have gone dormant for the time being.

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