Bulletin d’avalanche

Lizard-Flathead

Mar 1, 2019Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Human triggered avalanches remain possible, especially in wind loaded areas and at lower elevations where buried surface hoar layers exist.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Previous variable wind directions means that wind slabs may be found on all aspects. Up to 20 cm of new snow will likely be forming fresh wind slabs, and may make older wind slabs more difficult to detect.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–2.5
    Two weak layers of surface hoar may be found 60-120 cm deep in the snowpack. They are most prominent between 1600-1900 m, and have been the culprit in recent large avalanches, particularly in openings such as cutblocks, gullies, and slide paths.

Confidence

Moderate -

Weather Forecast

THURSDAY NIGHT - Cloudy with scattered flurries, 5-10 cm / southwest winds 10-20 km/h / alpine low temperature near -13FRIDAY - Mainly cloudy with isolated flurries, 5 cm / east winds 10-20 km/h / alpine high temperature near -13SATURDAY - Mainly sunny / east winds 10-15 km/h / alpine high temperature near -21SUNDAY - Sunny / northeast winds, 10-20 km/h / alpine high temperature near -15

Avalanche Summary

A few natural wind slab avalanches size 1.5-2 on northwest aspects were reported on Wednesday.On Monday, size 1 natural and human triggered wind slab avalanches were reported on all aspects at treeline and in the alpine. On Saturday, numerous natural and explosives triggered storm slab avalanches to size 2-2.5 were reported on north and east aspects in the alpine and treeline. These avalanches were 50-100 cm deep.

Snowpack Summary

10-20 cm of new snow sits on previous wind slabs at upper elevations.  In sheltered areas and below treeline, the new snow sits on facets (sugary snow) surface hoar (feathery crystals) and a crust on south facing slopes.There are potentially three weak layers of surface hoar in the top 100 cm of the snowpack.  One is down 30-50 cm, another is down 40-80 cm and the last one is down 80-110 cm.  These layers are most prominent between 1600-1900 m.The lower portion of the snowpack is considered generally strong.

Régions couvertes