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Avalanche Awareness
       Presented by
Canada 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 weight


Failure 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. 2m
in depth. Size 3 avalanche, 28
degree slope at fracture line
Dec 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
Avi resources

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Avi resources

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