Bulletin d’avalanche

Kananaskis

Mar 10 – 11, 2015Alberta Parks
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Archivé · expiré 12 years ago

Danger d’avalanche

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

The snowpack is in transition to Spring conditions, but it is not there yet. Danger levels will rise on solar aspects with solar radiation and daytime heating. A poor freeze is expected Wednesday night. Ski quality remains poor in most areas.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Wind slabs have become more reactive in steep terrain over the last few day. Both human and naturally triggered slides have occurred.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Daytime heating and solar radiation is causing loose wet slides up to size 2.0 on steep solar aspects. Shallow snowpack areas and rocky terrain is more quick to heat up and destabilize.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    The basal weak layers ares still a concern in steep alpine terrain, especially in shallow snowpack areas. Large triggers, such as cornices, may also be enough to wake up this deep persistent weak layer.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

A mix of sun and cloud for Wednesday with strong winds from the west. Temperatures will be mild with freezing levels rising to 2200m. Very light precipitation is possible on Thursday under a mix of sun and cloud and mild temperatures.

Avalanche Summary

A size 2.5 slab avalanche occurred in the past 24 to 48 hours on a steep south-west aspect at 2700m on Snow Peak. The avalanche was a wind slab, but it is suspected to have been triggered by solar radiation in the shallow snowpack start zone. Several loose wet avalanches up to size 2.0 have also occurred on steep south, south-west and west aspects in the past 2 days.

Snowpack Summary

Widespread wind effect in the alpine and open areas at treeline. These areas exhibit hard wind slab, soft wind slab, sastrugi, breakable wind crust and everything in between. Solar aspects were moist to 2600m, but sheltered polar aspects stayed dry all dry. The November facets/depth hoar combo persists and has been responsible for a couple of recent natural and human triggered slides.

Régions couvertes