Bollettino valanghe

South Columbia

Apr 13 – 14, 2013Avalanche Canada
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Archiviato · scaduto 13 years ago

Pericolo valanghe

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

In sintesi

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–6
    A layer of surface hoar is buried about a metre down, mainly on high northerly aspects. A surface avalanche stepping down, cornice fall, or the weight of a person from a thin-spot trigger point could trigger it.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–4
    Snowfall on Friday night and variable winds have created new storm slabs, especially near ridge top and on slopes in the lee of the wind.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Sunday: Very light snowfall / Light northeast winds / Freezing level at 1400mMonday: Mix of sun and clouds / Light east winds / Freezing level at 1400mTuesday: Mix of sun and cloud / Calm winds / Freezing level at 1600m

Avalanche Summary

Observations are becoming more limited; however a size 2 natural wind slab avalanche was observed on a lee alpine feature on Friday. A size 2 slab was also ski cut on a steep southeast facing convex roll. Surface hoar was the suspected interface.I would expect ongoing storm instabilities in the wake of new snow and wind on Friday night.

Snowpack Summary

Moderate to locally heavy snowfall on Friday night has created touchy new storm/wind slabs, especially near ridge top. This will add to existing storm slab and wind slab problems at alpine and treeline elevations. A surface hoar interface is buried within the upper metre or so of the snowpack, mainly on high-elevation northerly aspects. It may be slowly gaining some strength, but these slopes should still be treated with suspicion. On other slopes, recent storm snow overlies a crust, with a variable bond. At low elevations, moderate accumulations overlie previously rain-soaked snow which is now refrozen and strong.Recent wind and snow has added to the size and fragility of large cornices.

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