Bulletin d’avalanche

Jasper

Feb 15 – 16, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Ice climbers should pay close attention to the effect of warming temperatures on the snowpack.  Plan to be off climbs with solar exposed slopes above early in the day.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Thin pockets of windslab can be expected below Northeasterly ridge lines.  These windslabs may be triggered on steeper slopes.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1–3
    The hard windslabs that dominate the alpine snowpack have bridged weakness below.  These slabs have not been reactive. It may be possible to trigger an avalanche on steep unsupported terrain from thin areas and the edges of these slabs.

Weather Forecast

The mild valley bottom temperatures on Friday will not reach the alpine.  Moderate Westerly winds at treeline and below will reach severe in the alpine.  Skies will be partly cloudy and no new snow is expected.  On Saturday, models are calling for snow flurries that may produce localized amounts approaching 10-15 cm (don't hold your breath!)

Snowpack Summary

Hard windslab is bridging the weak basal facets above treeline.  Limited whumpfing has been observed at treeline in the Parker Ridge area.  Very little new snow in the past few days.  Moderate SW winds continues to build pockets of thin windslab on lee aspects at treeline and above. The snowpack is weak and faceted below treeline.

Avalanche Summary

On Wednesday, several loose snow avalanches were observed along SE facing alpine ridge lines.

Confidence

Forecast snowfall amounts are uncertain on Saturday

Régions couvertes