Lawinenlagebericht

Kananaskis

Mar 17 – 18, 2023Avalanche Canada
Auf der Karte ansehen
Archiviert · abgelaufen 4 years ago

Lawinengefahr

Sun
Mon
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig

Kernpunkte

Pay attention as you climb into Treeline and Alpine areas for the presence of windslabs in the upper snowpack. The sun is packing a punch these days so keep overhead terrain and aspect in your mind as you travel. As it warms up stability will decrease on these aspects.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2.5

    Watch for windslabs in immediate lees along ridgelines and in gullied terrain.

  • Cornices

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–3

    Avoid travelling near or below cornices as these will become weak with daytime heating.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–3.5

    The alpine is still variable in total amounts of snow but the basal layers haven't changed. The entire lower half is either facets, or depth hoar. Thin weak areas should be treated as suspect and avoided.

Confidence

Moderate

Avalanche Summary

Forecaster were out of the field by 1400 and had observed no new avalanche activity by this time. It would seem the more widespread natural avalanche cycle is beginning to taper.

Snowpack Summary

Recent storm snow has settled into a pleasant 20cm of settled snow. So far the winds haven't made an appearance which means we've been spared a widespread wind slab problem. There are some wind slabs still lurking in the alpine, but they generally seem to be high and in steep alpine terrain. But there is a catch (when isn't there?), the March 12th crust (solar) or facet (polar) layer is a slippery one and it doesn't need much of a cohesive surface layer to pose a problem. Unsupported alpine and treeline terrain is still concerning. The mid to lower pack remains variable, in every sense of the word. The depth changes dramatically on elevation, and the supportiveness of it seems to change at the drop of a hat. Thin spots and rocky areas are still a likely place to trigger the deeper problem layers.

Weather Summary

The high pressure ridge overhead is forecast to continue into Saturday. Temperatures will start at -18 and rise to -3 by early afternoon with a freezing level forecast to be around 2000m. The solar input was noticeable today, expect the same strong inputs on Saturday. As for the wind, only light breezes are expected for the next few days. Beautiful touring at the moment out there!

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Cornices become weak with daytime heating or solar exposure.

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