Avalanche forecast

Purcells

Feb 17 – 18, 2013Avalanche Canada
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Archived · expired 14 years ago

Avalanche danger

Tue
Wed
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
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Highlights

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–4
    New wind slabs have developed at higher elevations in areas that received new snow and wind.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–5
    There are a couple of older layers of buried surface hoar and crust combinations that are buried down about 70 cms and 100 cms, that may be triggered by large additional loads.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–4
    The buried February 12th surface hoar layer is expected to continue to be reactive. The amount of snow above the weak layer is variable across the region.

Confidence

Fair - Due to variable snowpack conditions for the entire period

Weather Forecast

Overnight and Monday: A weak ridge of high pressure is expected to give clear skies, light winds, and alpine temperatures dropping down to about -10.0 overnight. The ridge should continue to dominate on Monday bringing mostly clear skies with some valley cloud. The next trough is expected to move across the interior on Monday afternoon or evening bringing high cloud and a chance of light precipitation.Tuesday: Mostly cloudy with a chance of light precipitation and light winds.Wednesday: Another weak ridge is expected to fill in behind the trough, bringing light winds and cloudy skies in the morning. Broken skies and continued clearing in the afternoon.

Avalanche Summary

A natural avalanche cycle was reported to have occurred during the storm.

Snowpack Summary

The latest storm did not make it into most of the region. The February 12th weak layer of surface hoar is buried down anywhere from 15 cms in the Northeast of the region to 60 cms in the Southwest of the region. The January 23rd layer is buried down about 100 cms and continues to be a concern for professionals. Cornices are reported to be large and weak, and may fall off naturally.

Regions covered