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Basic avalanche resources for Western Canada by Canada West Mountain School

Basic avalanche resources for Western Canada by Canada West Mountain School

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    Avi resources Avi resources Presentation Transcript

    • Avalanche Awareness Presented byCanada West Mountain School
    • Avalanche Hazard Triangle ? Avalanche Hazard! People or property ?
    • Loose Snow Avalanches
    • Photo: Jasper National Park Photo: Mark Austin
    • Failure of slab through additional weightFailure in tensile strength Local Shear failure Wind Increased load on lee slope Failure in tensile strength Shear failure
    • Start Zone: Critical Angles Angles are only relevant to terrain in starting zones! 60-90 degrees Constant sluffs; Large slabs uncommon 25-45 includes a lot of common terrain!90 45-60 Frequent small avalanches; degrees infrequent large slabs 25-45 60 degrees Largest slabs; Frequent avalanches 45 10-25 Dry slabs degrees are uncommon; 25 Wet avalanches can occur occasionally
    • Avalanche “Crown” approx. 2min depth. Size 3 avalanche, 28degree slope at fracture lineDec 27, 2008
    • Snowpack Structure Understand the snow pack if you are in Avi terrain• Weather creates the snowpack know the weather history• Terrain effects modify the snowpack pay attention to changes in terrain• The snowpack will change over time constantly re-asses snow conditions• Have a visual picture of the snowpack
    • Information gathering for backcountry winter travellers
    • Where do we get our info??• Public Avalanche Bulletins• Weather offices, websites, etc• Highways departments• Parks offices• Local guides• Ski patrols• Local outdoor stores• Clubs and members• Information from prior trips• Online forums• Friends, people on the trail
    • Avalanche Bulletins• Canadian Avalanche Center Bulletin• Whistler-Blackcomb Avalanche Advisory• North Shore Avalanche Advisory• US Avalanche resources (avalanche.org)• European Bulletins
    • Weather information• Environment Canada Weather – Public Text forecast – Satellite imagery• Whistler-Blackcomb Alpine• Mount Seymour Alpine• Western Washington Univ.• Mountain Weather Services• Ski Resort Forecasts (snow-forecast.com)
    • Highways Departments• Highways Webcams (and others)• DriveBC.com
    • Local Guides• Mountain Conditions Report (MCR)• ACMG• Canada West Mountain School
    • Other resources• National Parks offices• Outdoor stores• Online forums – Telemarktips.com – CAA Forum• Clubs and members• Information from prior trips• Friends, people on the trail
    • Anniversary Glacier Avalanche and historical run-outs – Jan. 2008
    • Flute Bowl, Whistler Mountain – May 2008