Lawinenlagebericht

Waterton Lakes

Feb 10 – 13, 2015Parks Canada
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Archiviert · abgelaufen 12 years ago

Lawinengefahr

Tue
Wed
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Kernpunkte

New slabs formed at upper elevations are substantial and will take some time to settle over the previous crusts. Weak surface crusts breaking down with daytime heating make for difficult travel below treeline.

Lawinenprobleme

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    At upper elevations the new snow combined with mild temperatures and strong SW winds has created 50cm soft slabs. Rain crusts overly these new slabs to 2200m. Be cautious with steep or unsupported terrain until these slabs can settle and cool.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2
    Below 2000m the snowpack has been hit mainly by rain. Surface crusts are just beginning to form and are all that there is to hold the lid on what remains of the soaked snowpack.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–3
    Now 40 to 120cm deep these slabs continue to stand out as a real concern in the TL and ALP areas that do not have strong surface crusts. Be particularly mindful in thin snowpack areas where this layer is more likely to be triggered.

Weather Forecast

A weak ridge will form over the region by midday on Tuesday to bring some drier air and hopefully allow some cooling through Wednesday with only trace amounts of precip forecast. Thursday marks the beginning of an increasing trend in the freezing level through to the weekend. Winds will remain light to moderate out of the SW for the period.

Snowpack Summary

50cm of snow fell with strong SW winds on the Jan 31 crusts above 2000m with the last storm. Rain has created surface crusts below 2200m and the entire snowpack remains moist with warm temps allowing only poor recovery. The Dec 13 layer down about 1m average is still a concern in high shaded terrain where there are no strong crusts above it.

Avalanche Summary

There was a great deal of avalanche activity over the weekend. With the rapid loading and winds, storms slabs to sz 2.5 failed above the Jan 31 crusts treeline and above some as a result of cornice failures. Below treeline surface crusts broke down with the rain allowing loose wet activity and a few wet slabs failing on the Dec 13 crust layer,

Confidence

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