Bulletin d’avalanche

Sea To Sky

Feb 26 – 27, 2012Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–5
    Recent wind shift (from southwest to north) has exacerbated the windslab problem.
  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Storm slabs linger as an avalanche problem in areas where they overlie buried crusts, facetted snow, and/or sheltered areas with buried surface hoar.

Confidence

Good

Weather Forecast

Monday: A mostly sunny day, with moderate northerly winds and temperatures reaching -5. Tuesday & Wednesday: Expect clouds to build, with light snow developing late Tuesday and tapering into Wednesday afternoon. Winds should turn southerly but remain light with temperatures reaching -5 in the afternoons.

Avalanche Summary

We have reports of explosive and natural avalanches up to size 2.5, with the largest avalanches releasing on exposed north facing terrain. Rider triggered avalanches linger in the 1.0-1.5 size range.

Snowpack Summary

Another 15cm of new snow brings the total settled storm snow to around 60cm. This storm was initially accompanied by moderate to locally strong south and west winds, yielding intense slab production on North through East facing terrain at treeline and in the alpine. Windslab releases on north facing terrain have been as deep as 100cm. At the tail end of the storm, winds turned northerly, loading exposed south facing terrain. The new snow overlies a variety of wind modified surfaces, crusts at lower elevations and small islands of surface hoar in sheltered areas. Easy shears persist in the new storm snow (decomposing fragments down 25cm) while the deeper interface (down 60cm) is beginning to show signs of improved bonding. Below this, the mid and lower snowpack is well bonded and strong.

Régions couvertes