Bulletin d’avalanche

Jasper

Feb 23 – 24, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

If we get more snow than is forecast, the danger rating will increase. Assess wind-loading patterns carefully.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Saturday's 20cm of snow has evolved into a variable windslab and appears to be bonding well. It sits on a variety of surfaces such as previously hard slab and sastrugi.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    With the potential of this new snow load and winds Friday evening, expect increase in activity until has had few days to stabilize. 

Weather Forecast

Friday evening may bring 10-20cm (10mm water equivalency), possibly more with local influences but precipitation amounts are uncertain. There is more confidence in severe SW alpine winds with brisk winds at treeline. Front expected to dissipate Saturday a.m.. Saturday to Monday will have  flurries and seasonal temperatures.

Snowpack Summary

Variable windslabs exist in the alpine and treeline locations. They are bonding well. Expect a short lived storm snow instablity to form with the current system. Weak facets dominate low elevations. Solid midpack bridges basal facets treeline and alpine.

Avalanche Summary

No Patrol Friday. Thursday's Marmot Basin Portal creek patrol revealed no new avalanches. No Patrol on Wednesday.

Confidence

Forecast snowfall amounts are uncertain on Saturday

Régions couvertes