Bulletin d’avalanche

Jasper

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

Danger d’avalanche

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

Inverted temperatures will mean that it will feel cold in the valley, while upper elevation start zones may be undergoing a rapid temperature increase.  Ice climbers should avoid climbs below solar facing slopes.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Last week's 30cm storm has produced new wind slabs on a variety of aspects. These slabs are resting on a surface hoar layer (Jan6) that is fairly widespread yet remains stubborn to triggers. Rapid warming will make these slabs easier to trigger.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    Where wind has not affected the slope, 30cm of cold unconsolidated snow is sluffing out of steep terrain.  Solar input and warming temps are expected to increase the frequency of these natural avalanches.

Weather Forecast

The big story over the next few days is the spike in temperatures, especially up in the alpine.  As a new warm and moist airmass slides in, this will introduce a rapid temperature change to a cold snowpack. Strong NW winds in the alpine and the possibility of rain below treeline. Possibility of intense solar radiation and inverted temperatures.

Snowpack Summary

Snowpack remains thin and facetted at lower elevations.  Last week's storm snow has buried a surface hoar layer (Jan6) down approx 30cm.  New windslabs at upper elevations that were previously stubborn to trigger may quickly become touchier as they undergo a rapid temperature change and increased loading with strong winds.

Avalanche Summary

Tuesday's warm temps will introduce rapid temperature change to a cold snowpack and may lead to a natural cycle and/or touchy slab conditions, as well as increased loose snow avalanches from steep solar aspects.

Confidence

Timing or intensity of solar radiation is uncertain

Régions couvertes