Bulletin d’avalanche

Purcells

Mar 30, 2019Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Cooler cloudy weather is approaching, but the danger will still be moderate during the heat of the day.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5
    Lingering slabs from Tuesday's storm may remain reactive to human triggers on Friday. This problem is likely to become increasingly confined to steeper, wind loaded slopes at ridgecrest.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    A springtime regime of daily warm temperatures and sunshine will tend to destabilize surface snow each day, especially on steep, sunny slopes. Larger avalanches become possible during peak warming.

Confidence

-

Weather Forecast

FRIDAY NIGHT: Partly cloudy. Light southwest wind. Alpine temperatures drop to -5 C.SATURDAY: A mix of sun and cloud with cloud increasing over the day. Light west wind. Alpine high temperatures around 0 C with freezing level to 2000 m.SUNDAY: Mainly cloudy with isolated flurries in the afternoon and 5-10 cm of snow overnight. Light southwest wind. Alpine high temperatures around -2 C with freezing level to 1800 m.MONDAY: Light flurries continue throughout the day. Light northeast wind. Alpine high temperatures around -2 C with freezing level to 1800 m.

Avalanche Summary

Minimal avalanche activity has been reported in the Purcells over the past couple days. One small naturally-triggered wind slab was observed on a northeast alpine slope on Thursday. Looking forward, expect continuing warm, sunny weather to ramp up loose wet avalanche problems with each day's warming cycle.

Snowpack Summary

Variable new snow amounts of about 5 to 25 cm from a storm earlier in the week buried a crust in most areas above 1500 m. Below this elevation it buried variably moist or crusty surfaces. Precipitation fell as rain below about 1100 m. The snowpack below about 1500 m has been disappearing rapidly under the influence of warm temperatures, strong sunshine, and rain. The chance of loose wet avalanches increases each day as these factors break down surface crusts and bring snow to its melting point.The mid snowpack is generally consolidated and strong, but exceptions may exist on north aspects above 2000 m, where a layer of faceted grains may still be preserved beneath 40 to 60 cm of hard wind-affected snow.The base of the snowpack is composed of weak faceted snow which may coexist with a melt-freeze crust. Only one very large persistent slab was reported to have failed at this layer during last week's warming event.

Régions couvertes