Avalanche forecast

South Coast Inland

Feb 8, 2018Avalanche Canada
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Avalanche danger

Fri
Sat
Alpine
4 · High
Treeline
4 · High
Below
3 · Considerable
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Highlights

Storm snow amounts will vary across the region. The Coquihalla will see higher amounts then the Duffy. Avoid avalanche terrain.

Avalanche problems

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1.5–2.5
    Recent snowfall and strong winds have created large fragile cornices. Cornices are unpredictable and demand respect. Give them a wide berth from above and below. Know what is lurking above you.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely - Very Likely
    Size
    1–3
    New storm snow accumulations will build touchy storm slabs, especially on leeward slopes where more wind loading occurs.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Thursday

Weather Forecast

Thursday: 15-30 cm overnight Wednesday at upper elevations, with the higher accumulations being in the southern part of the region. 5-15 cm Thursday morning tapering off by early afternoon. Ridgetop winds strong from the southwest. Alpine temperatures near -5 with freezing levels 1300 m. Friday: Mix of sun and cloud with alpine temperatures near -8 and freezing levels at valley bottom. Ridgetop winds light from the north. Saturday: Mostly clear with no forecast snow. Alpine temperatures near -10 and ridgetop winds light from the northeast.

Avalanche Summary

On Tuesday, no new avalanche observations were reported from the northern part of the region (Duffy). In the south (Cascades) numerous glide avalanches up to size 3 were reported. Glide releases have a higher likelihood of failing when the ground cover is smooth bedrock or grass. Other avalanches to note from the south include wet slab avalanches up to size 2.5 with one reported as a size 3 from a steep southeast slope near 1700 m. Natural avalanches are likely with forecast storm snow, rain at lower elevations and strong ridgetop winds.

Snowpack Summary

Recent snowfall totals are highly variable. In the south, up to 20 cm of new snow fell bringing the alpine totals up to 40 cm since the weekend. In the north, new snow totals are half that and rapidly decreasing below 1800m. This new snow sits on old wind slabs in alpine locations and has buried a crust at treeline. At lower treeline and below elevations, warm temperatures (and rain in many locations) have created heavy snow conditions. This new snow adds to the 80-150 cm mid pack that sits above the mid- January crust, which generally shows signs of bonding. I would still remain suspect of this deeper layer, especially now, with additional load stressing the snowpack. Large fragile cornices could also act as a trigger on the slope below.

Regions covered