Lawinenlagebericht

Banff Yoho Kootenay

Mar 21 – 22, 2015Parks Canada
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Archiviert · abgelaufen 12 years ago

Lawinengefahr

Mon
Tue
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Kernpunkte

Watch locally for sun effect on the new snow in the alpine as this will increase the avalanche danger. We probably will not see a decent freeze in large portions of the region to start Sunday. SH

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2
    10 cm of recent storm snow has formed wind slabs up to 35cm in the lee areas at treeline and above. These will be sensitive to human triggering on features such as ridge crests and cross loaded gullies. Cornices are also becoming a concern.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2
    Rain below 2000m Saturday means the snowpack will likely be isothermal below treeline and some treeline areas.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–3
    The lower half of the snowpack is weak due to the presence of basal facets and depth hoar. This layer has been dormant lately but may become more sensitive with the forecasted new snow load, especially in thin areas.

Weather Forecast

A small pulse of snow which could produce another 5-10cm and rain below 1800m is moving through the forecast region Saturday night.  Freezing levels to 1700m Sunday with a mix of sun and cloud and light to moderate westerly winds. 

Snowpack Summary

10 - 15cm of snow over the last 48 hours in the alpine with moderate SW winds and temps near 0`C. Wind slabs present in isolated lee and open areas in the alpine. The recent snow sits on a variety of stiffer surfaces. The base of the snowpack is made up of facets and depth hoar and remains weak. Below tree line snow is isothermal in the afternoons

Avalanche Summary

Local ski areas were able to ski cut small wind slabs (sz.1) in immediate lee areas on Saturday. 

Confidence

Freezing levels are uncertain on Sunday

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