Bulletin d’avalanche

South Coast Inland

Jan 25 – 26, 2019Avalanche Canada
Voir sur la carte
Archivé · expiré 8 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

Warm air and sunny skies will influence the snowpack on Saturday. The amount of warming is uncertain; expect the most warming on south aspects and for the snowpack to possibly moisten on other aspects too. This may make the snow very touchy.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    Around 30 to 60 cm of snow sits above a weak layer of surface hoar and variable crusts. The warm air may make it more likely to initiate an avalanche on these layers. Treating this snow with caution is advised.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–1.5
    Warm air and sun will likely moisten the snow surface. If this occurs, expect natural loose wet avalanches and for them to be touchy to human traffic. This will likely be most pronounced on southerly aspects.

Confidence

Moderate - Freezing levels are uncertain

Weather Forecast

FRIDAY NIGHT: Clear skies, freezing level rising to 2700 m.SATURDAY: Clear skies, light northwest winds, alpine temperature between 2 C and 6 C, freezing level 3000 m with inversion conditions.SUNDAY: Clear skies, moderate northwest winds, alpine temperature near -1 C, freezing level dropping from 2000 m to 1000 m over the day.MONDAY: Clear skies, light north winds, alpine temperature -7 C, freezing level below valley bottom.

Avalanche Summary

The surface hoar buried 30 to 60 cm has been reactive to skier traffic in the past few days. Check out recent avalanche reports in the MIN, here and here.Looking towards the weekend, the likelihood of triggering the layers discussed in the Snowpack Summary may increase. Also expect loose wet avalanches if the air temperatures reach as warm as the weather forecast predicts.

Snowpack Summary

Warm air temperatures are entering the region and may moisten the snow surface at all elevations and on all aspects, but most pronounced on south aspects. Beneath this, around 30 to 60 cm of snow sits on a sun crust on southerly aspects, a temperature crust below around 1700 m on all aspects, and feathery surface hoar in areas sheltered by the wind at all elevation bands. The surface hoar may be most pronounced on west, north, and east aspects below 2100 m. This layer may be touchy to human traffic this weekend.Below this, the snowpack is generally well-settled. In certain parts of the region, you may still find a weak layer of surface hoar buried about 60 to 120 cm in sheltered areas around treeline. There haven’t been any recent avalanches on this layer but the likelihood of triggering it may increase this weekend with warm air temperatures.

Régions couvertes