Avalanche forecast

Northwest Inland

Mar 2 – 3, 2013Avalanche Canada
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Avalanche danger

Mon
Tue
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
2 · Moderate
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Highlights

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–5
    Strong winds throughout the region have set up wind slabs in the lee of ridges and terrain features. Watch also for growing cornices.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1–4
    Storm slabs may remain in the west and the south of the region where there were deeper recent snow amounts. Watch for snow weakening on sun-warmed slopes.

Weather Forecast

Sunday: No snow expected. Sunny breaks. Light winds. Freezing level around 700 m.Monday: No snow. Sunny breaks. Light winds. Freezing level around 800 m.Tuesday: No snow. Light winds. Freezing level 100 m.

Avalanche Summary

A natural cycle to size 2.5 was reported from last week's storm. Small (size 1) soft slab avalanches could be triggered in response to ski-cutting at treeline on north aspect slopes through the whole week. On Thursday, a size 1.5 avalanche was human-triggered below treeline on a north aspect running on a melt-freeze crust.

Confidence

Fair - Due to limited field observations

Snowpack Summary

Recent storm snow amounts are 30-50 cm in the west of the region and more like 10 cm in the east. Strong southwest winds have formed touchy wind slabs in exposed terrain in the lee of ridges, gully side walls, and behind terrain features. There are a variety of old interfaces now down 60 - 100cm which include facets, crusts and isolated pockets of surface hoar. Recent observations indicate that these weaknesses have bonded fairly well now, but I still suggest digging and testing the snowpack to confirm.A strong mid-pack currently overlies a weak base layer of facets/depth hoar. It is worth noting that the snowpack in general is quite shallow in northern and eastern parts of the region. Triggering the basal weakness may still be possible from thin spots, rocky outcrops or under the weight of larger triggers such as cornice fall.

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