Bulletin d’avalanche

Jasper

Mar 17 – 18, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Avalanche danger will increase if sun comes out. The trend will be cold nights followed by daytime heating.

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    There remains 20-50 cm of unconsolidated storm snow on and above local ice climbs.  This snow is susceptible to solar, wind and human triggering forming loose snow avalanches of significant mass.  Enough to knock climbers or skiers off their route. 

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    10-20 cm of snow arrived last night with steady strong N winds. 80-100cm cm has fallen since Wednesday. This was the first real wind and many slopes appear to have a soft slab at exposed treeline and alpine locations. Reverse loading occurred.  

Weather Forecast

Monday will be flurries with potentially 10-15cm Sunday night to Monday night, seasonal temperatures, and possibly 75km/hr West winds at 3000m. Tuesday will be sunny, rising freezing levels from the sun and calm winds. Wednesday will bring a weak pulse of snow and the freezing level will rise to 1500m.

Snowpack Summary

Soft slabs have formed on exposed treeline locations and above from Saturday nights strong North winds. Expect reverse loading patterns. 90+cm of snow has fallen since Wednesday and this was our first real wind. At treeline, soft slabs rest on a thin suncrust buried 80 cm deep in exposed south facing terrain.  Snow below treeline is unconsolidated.

Avalanche Summary

Maligne and Icefields patrolled today with 100% visibility. A few size 3 storm slab avalanches have run on large planar alpine slopes. They appear to be initiating in lower start zones around 2500m. Numerous loose solar sluffs to size 2 noted mainly on SW-NW aspects with a few on East aspects. Natural activity was increasing with solar punch. 

Confidence

Timing or intensity of solar radiation is uncertain on Tuesday

Régions couvertes