Bulletin d’avalanche

Northwest Inland

Apr 6 – 7, 2017Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Most slabs avalanches in the past week have been triggered by cornices. Be cautious in wind affected terrain.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Strong winds and light amounts of snow have likely left wind slabs in the lee of exposed terrain.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2
    Cornices have been growing and may fall off naturally with daytime warming.

Confidence

Moderate - Due to the number and quality of field observations

Weather Forecast

FRIDAY: Cloudy with isolated flurries, strong southeast wind, freezing level up to 1500 m after an overnight freeze.SATURDAY: 5-10 cm of new snow, light southeast wind, freezing level around 1400 m.SUNDAY: Mostly cloudy, moderate south wind, freezing level around 1300 m.

Avalanche Summary

Several thin wind slabs were reported in northerly terrain in the Howsons on Wednesday. A few cornice triggered slabs have been reported throughout the region over the past week (up to size 2.5).

Snowpack Summary

Strong winds with light amounts of snow formed fresh wind slabs in exposed terrain on Wednesday. Elevations below about 1300 m are experiencing a daily melt-freeze cycle. Hard crusts form overnight and become moist during the heat of the day. Hard crusts may be found at higher elevations, particularly on slopes that were sun-exposed. The February crust and facet layer is 70-90 cm deep in the Houston Telkwas sled area and a deep persistent faceted weak layer is still lingering near the bottom of the snowpack in all areas.

Régions couvertes