Boletín de aludes

Jasper

Apr 15 – 16, 2018Parks Canada
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Archivado · caducó 8 years ago

Peligro de aludes

Tue
Wed
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
1 · Débil
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Lo esencial

Winter persists for the next 2 days. Avoid traveling or stopping under large slopes or corniced features as they may be sensitive to triggering.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2
    Overloaded and under tension, new and buried windslab in the Alpine and TL is sensitive to further loads, like more wind, more snow, more sun and, especially riders.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1.5–2.5
    Large cornices in all areas of the bulletin region. These failures are triggering persistent instabilities and the subsequent avalanches are proving large and destructive. Give these features a lot of room.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1.5–3
    A slab up to 1m thick overlies: weak faceted crystals, and sun crusts (on steep S and W aspects). This problem has been associated with large triggers like cornices and the subsequent avalanches are proving large and destructive.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Scattered flurries to continue for the next 48 hours. Accumulations and loading may vary significantly. Forecasted snow amounts for 25 cm for the Icefields and 20 for Maligne regions. At lower elevations (under 1800m) the snowpack is vanishing and what snow remains is not supportive with warming.  Winds remain light with mod gusts at ridge top.

Snowpack Summary

A further 4cm, with previous HST totals up to 20cm with varied localized amounts as unsettled weather continues. Mod SW winds have certainly overloaded wind slabs and cornices in open areas at TL and ALP. Persistent instabilities (down 40 to 100 cm) are sensitive to large triggers like cornices, especially on N asp slopes at TL and ALP elevations.

Avalanche Summary

Poor visibility in the region today, reported audible (heard, not seen) avalanches in the Icefields.A large (Size 2.5) persistent slab avalanche was reported Saturday, from a N asp in the alpine.Great information being shared daily on Avalanche Canada's MIN Reports for the Maligne, Whistler's Creek and Icefields regions.

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