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Published byCharles Nolet Modified over 4 years ago
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Avalanches Current Weather Avalanche Triangle Avalanche Types Slides
For Next Class: Read Chapter 18
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Avalanche Triangle
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WEATHER Snow Storm Wind
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WEATHER DANGERS Big Snow Storm 30+ cm Wind 20+ kph
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TERRAIN DANGERS Slope Angle Terrain Traps Convex Slopes Cornices
30 to 45 degrees Terrain Traps Convex Slopes Cornices
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38 degrees Slope angles From Staying Alive In Avalanche Terrain p. 63, Bruce Tremper after Schweizer& Jamieson
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Valleys/Canyons Moraines Crevasses Terrain Traps
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CONVEX SLOPES
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Cornice Formation
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Cornice Falls Most commonly release due to daytime warming
Less commonly from overburden of drifting snow Other factors include: Weakening on windward side (solar warming, wind-erosion)
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SNOWPACK DANGERS Shooting Cracks Collapsing Snow Recent Avalanches
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T. Murphy
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Slab Avalanches Strong snow over weak snow Fractures in rapid sequence
Releases as a unit Can be small or large and highly destructive
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SLOPE ANGLE >30 degrees
SLAB Dense snow layer Weak Layer Trigger you or me
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ROUTE FINDING Peter Thurston Photo
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Route-Finding Avoiding the hazard ? Snow Japan
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This must include everyone in your group!!
REQUIRED Avalanche Rescue Equipment When Traveling in Avalanche Terrain… Photo of ski touring This must include everyone in your group!!
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Required Avalanche Rescue Gear
A working AVALANCHE BEACON Metal SHOVEL Collapsible PROBES (digital -triple antenna)
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KEY POINT: Avalanche rescue skills & equipment – Is NOT a justification for choosing high consequence terrain when avalanche hazard and uncertainty exist.
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Take Home Point To Remember
New Snow 30+ cm Storm Best to Wait 1-2 days
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Avalanche Awareness
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Tunnel Creek
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