Bulletin d’avalanche

Jasper

Mar 30 – 31, 2021
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Archivé · expiré 6 years ago

Danger d’avalanche

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

Points saillants

Unsettled and changing conditions forecasted up to, and through the holiday weekend.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5

    Recently formed wind slabs can be found in all features near ridge crests, and cross-loaded gullies. Reverse loading seen recently from uncharacteristic North winds, mostly in the Icefields but evident throughout the bulletin region. 

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3

    When in the Whistlers/Portal and Maligne regions identify and assess the bond at this mid-pack layer. This interface shows strength in field tests but, there is concern for wide, spacial variability over large, and/or connected features.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2

    This new snow instability will cycle and heal over time but, for the near future be extra cautious in steep and restrictive terrain. Sluff management and diligent group handling necessary for these confined features.

Weather Forecast

Partly cloudy with few scattered flurries for Tuesday night and Wednesday. As we approach Easter weekend, a new cycle, ramping up Thursday afternoon will bring snow back into the region and push freezing levels down from their Wednesday peak. Generally unsettled, convective conditions forecasted.

Snowpack Summary

Widespread variability at the surface with up 20cm settled HN in the Icefields Area. New snow overlies previous surfaces such as hard windslab and variable crusts at TL/ALP elevations. The snow pack shows strength and good bonding in field tests but feels weak overall in the shallow regions like Whistlers/Portal creek and Maligne zones.

Avalanche Summary

Natural activity has tapered off. Loose dry and evidence of significant wind slab activity during, and immediately following the storm cycle on Sunday showed numerous releases, mostly West through SW aspects but, especially in steep alpine and high treeline features.

Confidence

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

Régions couvertes