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           ...
Start Zone: Critical Angles                                                  Angles are only relevant to                  ...
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 hist...
Information gathering   for backcountry   winter travellers
Where do we get our info??•   Public Avalanche Bulletins•   Weather offices, websites, etc•   Highways departments•   Park...
Avalanche Bulletins• Canadian Avalanche Center Bulletin• Whistler-Blackcomb Avalanche Advisory• North Shore Avalanche Advi...
Weather information• Environment Canada Weather  – Public Text forecast  – Satellite imagery• Whistler-Blackcomb Alpine• M...
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...
Anniversary Glacier Avalanche and historical run-outs – Jan. 2008
Flute Bowl, Whistler Mountain – May 2008
Avi resources
Avi resources
Avi resources
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Avi resources

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Basic avalanche resources for Western Canada by Canada West Mountain School

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Avi resources

  1. 1. Avalanche Awareness Presented byCanada West Mountain School
  2. 2. Avalanche Hazard Triangle ? Avalanche Hazard! People or property ?
  3. 3. Loose Snow Avalanches
  4. 4. Photo: Jasper National Park Photo: Mark Austin
  5. 5. Failure of slab through additional weightFailure in tensile strength Local Shear failure Wind Increased load on lee slope Failure in tensile strength Shear failure
  6. 6. 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
  7. 7. Avalanche “Crown” approx. 2min depth. Size 3 avalanche, 28degree slope at fracture lineDec 27, 2008
  8. 8. 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
  9. 9. Information gathering for backcountry winter travellers
  10. 10. 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
  11. 11. Avalanche Bulletins• Canadian Avalanche Center Bulletin• Whistler-Blackcomb Avalanche Advisory• North Shore Avalanche Advisory• US Avalanche resources (avalanche.org)• European Bulletins
  12. 12. 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)
  13. 13. Highways Departments• Highways Webcams (and others)• DriveBC.com
  14. 14. Local Guides• Mountain Conditions Report (MCR)• ACMG• Canada West Mountain School
  15. 15. 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
  16. 16. Anniversary Glacier Avalanche and historical run-outs – Jan. 2008
  17. 17. Flute Bowl, Whistler Mountain – May 2008

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