Lawinenlagebericht

North Rockies

Mar 22 – 23, 2023Avalanche Canada
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Lawinengefahr

Fri
Sat
Hochgebirge
2 · Mässig
Waldgrenze
1 · Gering
Unterhalb
1 · Gering
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Kernpunkte

The weather pattern changes after after a another sunny day on Thursday.

Minimize your exposure to steep, rocky terrain facing the sun during the warmest part of the day.

Lawinenprobleme

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–1.5

    Strong solar radiation will increase the likelihood of wet loose avalanches on sunny aspects in the alpine.

  • 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.

Avalanche Summary

Numerous size 1-1.5 wet loose avalanches triggered by solar radiation were reported on sunny aspects at upper elevations on Monday and Tuesday.

Confidence

High

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

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

Wednesday Night

Mostly clear / 30 km/h southwest ridgetop wind / Temperature at treeline around -7 C / Freezing level at valley bottom

Thursday

Mix of sun and cloud / 20 km/h south ridgetop wind / Temperature at treeline around -3 C / Freezing level 1700m

Friday

Cloudy with isolated flurries; 0-3 cm / 10 km/h east ridgetop wind / Temperature at treeline around -6 C / Freezing level 1100m

Saturday

mostly cloudy with isolated flurries / 20 km/h west ridgetop wind / Temperature at treeline around -5 C / Freezing level 1200m

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • Cornice failure may trigger large avalanches.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.

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