Bulletin d’avalanche

Jasper

Feb 19 – 20, 2013Parks Canada
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Archivé · expiré 14 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

The recent storm snow is still settling in yet evolving into a windslab. Pockets of instability may exist where the snow fell on a smooth surface and is resistant to bonding. Identify and evaluate these features of concern when traveling. 

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Saturday's 20cm of snow is developing into a surface windslab on SE slopes. As the winds shift Southerly, slabs will build on NE-NW aspects. The new slabs are sitting on previously hard slab and sastrugi surfaces.

Weather Forecast

Tuesday to Thursday will be seasonal temperatures, clouds with flurries of 1-3cm accumulation, Northwest switching to Southwest winds, and cold nights. No significant change expected. 

Snowpack Summary

Saturday's 20cm of snow has settled down to 10-15cm. It is developing into a surface windslab on SE slopes with NW winds. As the winds shift Southerly, slabs will build on NE-NW aspects over the next few days. These new slabs are sitting on previous hard slab and sastrugi surfaces which bridges the weak basal facets near the ground.

Avalanche Summary

Sunday in the Icefields, only two small storm snow slab avalanches were noted from steep NE facing rocky treeline slopes. No other avalanches were observed along the Icefields Parkway and visibility was good. Several size 2 avalanches were noted on Sunday in the Whistler creek alpine. No new naturals were noted Monday and visibility was good.

Confidence

Due to the number and quality of field observations

Régions couvertes