Bulletin d’avalanche

Jasper

Feb 12 – 13, 2022
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Archivé · expiré 5 years ago

Danger d’avalanche

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

http://www.pc.gc.ca/apps/links/goto_e.asp?destination=http://avalanche.ca/spaw/2022-02-10-spaw

Current warming trend was less dramatic then originally forecasted. A cautious attitude is still recommended as our first significant warming event adds stress to a complicated and variable snowpack.

Avoid solar slopes during peak warming.

Problèmes avalancheux

  • Wind Slabs

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

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3

    Persistent slabs sit over different weak layers depending on elevation & aspect. Above 1950m a buried facet layer down 20-40cm is the primary concern. Below 1950m, a faceting crust down 40-70 is presenting a more stubborn version of a similar problem

  • Loose Wet

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

    Be aware of your exposure to overhead hazard and avoid solar slopes during the heat of the day.

Weather Forecast

Saturday: Sun and cloud. No Precipitation. Freezing level rising to 1900m. Wind West 10-30km/h

Sunday: Cloudy with sunny periods. Freezing level 1900m. West wind 10-25km/h.

Monday: Cloudy with sunny periods and Isolated flurries. Trace precipitation. Freezing level 1500m.

Snowpack Summary

Weak temperature crust on all aspects up to 1900m with a 1cm sun crust on solar aspects extending into alpine. Upper snowpack has settled but expect reactivity to increase during peak warming/ solar exposure. Exposed alpine stripped to rock at ridgetop & open features. Dec Facets down 20-70cm. Basal faceting & depth hoar widespread throughout area.

Avalanche Summary

Avalanche control using explosives produced size 2 wet loose results Thursday. A Natural size 3 persistent slab avalanche was noted from a SW aspect on Nigel peak; estimated date Feb 09- likely triggered by large cornice fall from above.

No new avalanche activity observed on the Icefields Parkway or Maligne Lake Road on Friday, Feb 11.

Confidence

Régions couvertes