Avalanche forecast

South Coast Inland

Dec 2 – 3, 2018Avalanche Canada
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Avalanche danger

Tue
Wed
Alpine
2 · Moderate
Treeline
1 · Low
Below
1 · Low

Highlights

We're on a positive track with last week's avalanche problems mostly stabilized, but you can likely still find trouble spots of wind slab and cornice in the alpine.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–1.5
    If there's any good riding/travel to be had, it's going to be in the alpine. This is also where you're most likely to find pockets of wind slab that could remain sensitive to human triggering.
  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    Cornices have likely formed along alpine ridgelines. Cornices are inherently weak and can fail under the weight of a person or group.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

Sunday night: Cloudy with clear periods. Light north winds.Monday: A mix of sun and cloud. Light northeast winds, increasing over the day. Alpine high temperatures around -10.Tuesday: Mainly sunny with some valley cloud. Light northwest winds. Alpine high temperatures rising to around -2 under a mild temperature inversion.Wednesday: Sunny. Light northeast winds. Alpine high temperatures to around -3 under a mild temperature inversion.

Avalanche Summary

Two recent very large (size 3) avalanches were observed in the Joffre Lakes area on Saturday. These released from the high alpine northeast and northwest faces of Mt. Joffre and Mt. Matier, respectively. The evidence of the Mt. Matier slide features several 'step downs' as the slide progressively triggered deeper layers of the snowpack, all the way down to previous summer snow cover. Both slides likely released during last week's storm.Please submit any observations you have to the Mountain Information Network here.

Snowpack Summary

The storm from early last week produced ample precipitation, however it mostly fell as rain. Extreme out of the south and southwest likely produced widespread cornices and wind slabs in lee terrain during the storm. These problems are expected to be on a positive track toward stabilizing.A MIN from Friday suggests that it's skiable from about 1600 metres on up. Between 1600 and 2000 m there is 5 to 10 cm of low density snow over a 5 cm breakable crust. Above 2000m is reportedly skiing well and alpine snowpack depths are approaching 175 cm. Near the ground there is a crust/facet interface. Although little is known about the reactivity of this layer, recent observations in the north of the region show that it was reactive during last week's storm. It is thought that there is insufficient snow for avalanches below 1500 m.

Regions covered