Bulletin d’avalanche

Kananaskis

Jan 10 – 11, 2013Alberta Parks
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Archivé · expiré 14 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

There was a decline in Natural avalanche activity on Thursday but conditions are still touchy.  Now is NOT the time for big objective, it IS the time for conservative choices.  Be aware, many accidents happen immediately after a natural avi cycle!

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–3
    Steep terrain continues to produced loose dry avalanches up to size 1.5. These dry avalanches may produce larger storm slab avalanches on underlying slopes so be sure to minimize your exposure to overhead hazard.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    3–5
    Slabs up to 50cm thick are being encountered in all open terrain at treeline and above. Many slides failed on a surface hoar or facet interface down on average 50cm.  Watch for reverse loading with Fridays NW winds.

Confidence

Good

Weather Forecast

The main pulse of the storm is now past us and an arctic high to the north will begin to bring clear skies and cooler temps into the forecast region.  Winds will becoming more NW'erly over the next 24hrs but they are forecast to stay in the moderate to light range.  Lots of snow is available for transport so be sure to keep an eye on the winds and there is a definite potential for some reverse loading over the next few days.

Avalanche Summary

Numerous slab avalanches up to size 2 were observed in steep open terrain below 2150m.  These slides were only 30-40cm deep and likely failing on the 0106SH interface.  In the alpine, numerous slabs avalanche on steep south facing slopes were observed up to size 2.5.  These avalanches were failing within the storm snow and running to the top of their normal runouts.  Numerous loose dry sluffs up to sz 1.5 were also observed.

Snowpack Summary

An additional 24cm of snow fell overnight bringing our totals over the past week to 50cm of snow at lower elevations and closer to 70cm at higher elevations. Widespread storm slabs can now be found in alpine terrain.  These slabs vary from 30-50cm thick.  These slabs are overlying the 0106 Surface hoar/Facet interface.  The surface hoar is most prevalent below 2100m and more spotty in nature above this elevation.  At higher elevations, winds have developed stiff windslabs that are failing on this interface in the easy range in test results.  There was no evidence of any avalanches stepping down to any deeper instabilities.

Régions couvertes