Bulletin d’avalanche

Waterton Lakes

Mar 8 – 12, 2014Parks Canada
Voir sur la carte
Archivé · expiré 13 years ago

Danger d’avalanche

Mon
Tue
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
4 · Fort
Ouvrir la carte complète

Points saillants

An avalanche cycle is occurring. Heating in the form of sun on Saturday and Rain on Sunday may cause additional large and destructive avalanches. Travel is not recommended.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    The weak February facet layer is now buried up to 170cm deep. Large loads such as cornices have triggered this layer where it is deep and it has failed with sluffing and heating where it is shallow. Long propagations are possible with this layer.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Recent storms with warm temps and West winds have created slabs and built cornices. Wet slabs are failing BTL and solar aspects, cornices and windslabs are failing at TL and above.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–2
    Solar heating will likely result in these events occurring to ridge tops Saturday. Warm temps as well as the rain expected Sunday will cause these events at low elevations. Be aware that these small events may act as the trigger for deeper slabs

Weather Forecast

Warm temperatures are the main concern for the next few days. Some solar heating should be expected Saturday with freezing levels near 1800m. A warm wet system will reach the area in the evening. Up to 30mm of Precip is expected with freezing levels around 2000m. These heat inputs will affect surface snow and weaken both slabs and cornices.

Snowpack Summary

Warm conditions persist and maintain moist snow below 1800m. Suncrusts have formed on solar aspects. Storms slabs up to 50 cm thick have formed with W winds and warm temps. 70 to 170cm now buries the weak February facet layer and large avalanches have resulted when this layer is triggered demonstrating the ability of these slabs to propagate.

Avalanche Summary

Wind and warm temps caused a cornice failure that triggered a deep slab in the Alpine that ran to valley bottom. Moist snow at low elevations failed as slabs both on storm interfaces and the persistent layer with avalanches running near the bottom of their run outs. Loose wet events have occurred with warm temps BTL and on solar aspects.

Confidence

Intensity of incoming weather systems is uncertain

Régions couvertes