Avalanche forecast

Glacier

Feb 22 – 23, 2023Avalanche Canada
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Avalanche danger

Fri
Sat
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
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Highlights

Over a metre of new snow, winds from every direction, and now an Arctic deep freeze; cautiously approach the backcountry, given all the recent changes that Mother Nature has thrown onto the slopes!

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1.5–2.5

    Gusty outflow winds from the N and E are reverse-loading slopes rapidly, creating a reactive wind slab where normally the terrain is stripped of snow.

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–4

    Cornices have grown rapidly with snowfall and winds. A sharp drop in temps may shock these large masses, creating fragile conditions with sudden failures. These large natural triggers could reactivate our basal deep persistent weak layer.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1.5–3

    Up to a metre of storm snow, along with strong, variable winds, have left a widespread storm slab problem in the area. Watch for cracking in the snowpack and deeper slabs in wind loaded areas.

Confidence

Moderate

Avalanche Summary

A natural cycle Tues AM, with the dramatic change in wind direction, saw numerous avalanches to sz 3-3.5, especially from S'ly aspects. This came after 2 consecutive days of artillery control, which produced good results to sz 4.

Skiers up Connaught reported all Cheops N paths (1 through 6) had run at least once today, along with Frequent Flyer in the AM.

Snowpack Summary

Roughly 1m of snow has fallen in the last 3 days, accompanied by strong SW winds, creating a widespread reactive storm slab. Winds have now flipped to the NE and reverse loading is stacking wind slabs on S'ly aspects.

Several thin crusts are buried below the storm snow on steep solar aspects.

The deep persistent weakness at the base of the snowpack has been showing signs of strengthening recently.

Weather Summary

Here comes the Arctic air mass! Cold, heavy air is pushing south, bringing frigid temps and gusty NE'ly outflow winds until Saturday.

Tonight: cloudy, nil snow, Alp low -28*C, moderate E winds

Wed/Thurs: sun and cloud, Alp high -25*C, light/mod E winds

Terrain and Travel Advice

  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • Avoid exposure to slopes that have cornices overhead.
  • Avoid freshly wind loaded terrain features.

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