Bulletin d’avalanche

Jasper

Mar 1 – 2, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

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

A weak and variable snowpack (from recent strong winds and cold temps) warrants a cautious approach.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Previous wind effect will be difficult to assess under new snow. Expect hardslabs in the alpine and at treeline. The cold has reduced the tension in these but caution is still warranted, especially as new snow arrives over the next few days.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3.5
    A slab up to 80cm thick overlies: weak faceted crystals (well developed in shallow areas), surface hoar (at, and just above treeline), and sun crusts ( on steep S and W aspects). Faceting has reduced slab strength below treeline and in shallow areas.

Weather Forecast

Arctic air creeps into the region on Thursday and confronts the warmer low resulting in snow fall through Friday.Thursday: Cloudy with flurries (up to 5 cm). Alpine Low - 13C High -4C. Ridge wind light SE. Freezing level: 1600 meters.Friday: Flurries (up to 6 cm). Alpine Low -13 C, High -6 C. Ridge wind light SE. Freezing level: 1400 metres.

Snowpack Summary

Wind slabs and extensive wind effect found in all open areas. The upper snowpack is a 50 to 80 cm thick slab that sits on three weak layers in the mid-pack. The entire snowpack is faceting after two weeks of cold, dry weather. Whumpfing and collapses are more prevalent in the northern half of the forecast area.

Avalanche Summary

Isolated large Na avalanches were observed on a road patrol Wednesday, one windslab from a cross loaded pocket on a W aspect, and one persistent slab on an E aspect. Otherwise there has been minimal activity since the extensive avalanche cycle on February 8-9. Slopes that did not avalanche during this cycle should still be carefully assessed.

Confidence

Timing of incoming weather systems is uncertain

Régions couvertes