Bulletin d’avalanche

Kootenay Boundary

Nov 24 – 25, 2013Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

This bulletin was created using very limited field data. Significant variation in snowpack structure is likely to exist across the region. If you are out in the mountains, please send your observations to [email protected]

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–5
    Limited reports suggest it has become more difficult to trigger a persistent slab. However, if an avalanche is triggered, it has the potential to be large and destructive.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Loose wet activity will become more likely in the afternoon under sunny skies. Watch for increased reactivity on steep, sun-exposed slopes.

Confidence

Poor - Due to the number of field observations

Weather Forecast

An upper ridge of high pressure dominates until Tuesday resulting in dry conditions, light alpine winds, and mostly sunny conditions. A temperature inversion exists over most of the Kootenay-Boundary region with a layer of warm air sitting at mountain-top elevation. On Wednesday a weak upper trough will replace the high pressure system causing increased cloud cover and  the possibility of light snowfall.

Avalanche Summary

We have received limited reports of pin-wheeling and small loose snow avalanches releasing on steep, sunny aspects during afternoon warming.

Snowpack Summary

80-110cm of snow is typical at treeline although observations are limited and this amount may vary across the region. Roughly 60 to 70cm of well settled storm snow is now sitting on the October crust located just above the ground. Little is known about the reactivity of this crust; however, limited reports suggest that the crust interface is well bondedThe current temperature inversion is causing the snow surface to melt in the alpine. Sun exposed slopes are undergoing daily melt-freeze cycles. A surface crust is also being reported below 1700m. Large SH is forming on all aspects but is melting on south aspects during the daytime warming. If you are traveling in the mountains, now is a good time to make note of these surface conditions which may become persistent weak layers once buried by new snow.

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