Bulletin d’avalanche

Kootenay Boundary

Mar 17 – 18, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–5
    Be alert for wind slabs behind ridges and terrain breaks. Cornices may be touchy too.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely - Certain
    Taille
    1–2
    New snow is likely to slide easily on a buried crust. It may have enough force to trip you up or carry you into a terrain trap.

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Tuesday

Weather Forecast

Sunday night: Light snow. Light W winds. Alpine temperature near -9.Monday: Light snow (5-10 cm). Light W winds, gusting to strong NW. Alpine temperature near -5.Tuesday: No snow. Light to moderate SW winds. Alpine temperature near -3.Wednesday: Snow (10-15 cm). Moderate  S winds. Alpine temperatures near -4.

Avalanche Summary

A few small sluffs were observed on Saturday as new snow began to show a poor bond to the crust below. I’d expect there was a lot more of this type of activity on Sunday.

Snowpack Summary

Around 30 cm of dry new snow arrived overnight Saturday/Sunday, which landed on a hard refrozen crust in most places (the exception possibly being very high elevation terrain). Strong NW winds are likely to have shifted this new snow into touchy wind slabs in the lee of terrain breaks. In non-wind affected steep terrain, sluffs may be running easily.Deeper in the snowpack, weak interfaces of surface hoar and/or crusts have become much less likely to be triggered now that they are capped by a supportive crust. However, until more information is gathered about the distribution and resilience of the crust, I’d keep these deeper weaknesses in the back of my mind, especially where they might be stressed by a very heavy load or triggered from a place where the crust above is not as strong (e.g. high elevation terrain or thin spots around rocks).

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