Bollettino valanghe

Northwest Inland

Feb 3 – 5, 2012Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 15 years ago

Pericolo valanghe

Sun
Mon
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Warm alpine temperatures may result in unexpected large avalanches, especially on south-facing terrain.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–5
    Below ridge crests, behind terrain features and in cross-loaded gullies.

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–6
    Cornices are expected to become unstable with anticipated warm alpine temperatures.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–4
    Facets down 40-60cm may take some time to gain strength. Watch steep slopes, convex rolls, and unsupported slopes.

Confidence

Fair - Freezing levels are uncertain

Weather Forecast

Saturday and Sunday: Dry or very light flurries, with alpine temperatures around -2C. Winds expected to be light southwesterly rising to moderate southeasterly. Monday: Clear with sunny spells. Temperatures below freezing at low elevations but alpine areas may see inversion conditions that will elevate temperatures to near zero.

Avalanche Summary

Small cornice releases that have so far not released slabs on slopes below were reported from Friday. A large nautral avalanche (size 3) was reported from the Hankin-Evelyn from last weekend on a NW aspect.

Snowpack Summary

I suspect pockets of wind slab behind ridges & ribs at alpine and treeline elevations. I also suspect storm slabs on steeper terrain, unsupported slopes, or convex rolls. Deeper in the snowpack is a layer of facets (sugary snow) which formed during the cold mid-January drought. The combination of newer, warmer, cohesive snow above a thin, weak, rotten snowpack is a bad combination.

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