Lawinenlagebericht

North Rockies

Mar 18 – 19, 2023Avalanche Canada
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Lawinengefahr

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

Lingering wind slabs may remain reactive to human triggers in isolated locations at upper elevations.

Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    1–2

    Lingering wind slabs may remain reactive to human triggers in isolated locations at upper elevations.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely
    Größe
    2.5–4

    A weak layer of facets exists near the base of the snowpack. The likelihood of human triggering is low given the layer's depth, but large triggers such as cornice failures or smaller avalanches in motion have the potential to produce very large avalanches with surprisingly wide propagation. Suspect terrain for human triggering includes steep, shallow, and rocky terrain where the snowpack transitions from thin to thick.

Confidence

Moderate

Avalanche Summary

A few size 1.5 loose dry avalanches triggered by solar radiation were reported on sunny aspects at treeline and above on Friday.

A couple cornice triggered wind slabs up to size 2.5 were reported on steep, northerly aspects in the alpine on Thursday.

Snowpack Summary

Expect to find a melt-freeze crust on the surface of all aspects at treeline and below and on sunny aspects in the alpine. Solar radiation will break down the crust on sunny slopes throughout the day.

Lingering wind slabs formed by snow and wind earlier in the week may remain reactive to human triggers in isolated locations in the alpine.

The middle of the snowpack is generally well-settled and strong.

A weak layer of large facets is found near the base of the snowpack. This layer is of most significant concern in shallow snowpack areas in the north and east of the region. The most likely areas to trigger this layer are shallow, rocky areas or where the snowpack transitions from thin to thick.

Weather Summary

Saturday Night

Clear skies / 10 km/h south ridgetop wind / Temperature at treeline around -8 C / Freezing level valley bottom

Sunday

Sunny / 20 km/h east ridgetop wind / Temperature at treeline around -1 C / Freezing level 1800 m

Monday

Sunny / 20 km/h east ridgetop wind / Temperature at treeline around -2 C / Freezing level 1700 m

Tuesday

Sunny / 10 km/h northeast ridgetop wind / Temperature at treeline around -3 C / Freezing level 1500 m

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.
  • Carefully evaluate steep lines for wind slabs.
  • Cornice failure may trigger large avalanches.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • A moist or wet snow surface, pinwheeling and natural avalanches are all indicators of a weakening snowpack.

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