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Understanding hazards may
save your life!
Characteristics of Avalanche Terrain:
- Slopes with
wind-deposited snow
- Slopes steeper than
30 degrees
- Slopes near or
above the tree lines
- Clearings and areas
with little or no trees
Weather Conditions that Increase Risks:
- Recent or heavy
rain and or snow
- High winds
- Rapidly changing temperatures
- Most avalanches
occur during or after a storm
Warning Signs of Avalanche Danger:
- Previous avalanches
in same area
- Hollow or
"Whumping" sounds
- Cracks in snow
Recognizing Avalanche Terrain
Slope Angle-
Dangerous avalanches are most common between 30' and 45', ideal skiing, boarding
and snowmobiling slopes.
Orientation to Wind-
Lee slopes are a potential hazard because wind deposited snow often creates
unstable slabs. Windward slopes generally have less snow, which is
compacted and are usually more stable, in the absence of wind, slopes of any
aspect may avalanche. Slope profile, orientation to sun and the presence
of trees all influence avalanche potential and are topics covered in an
avalanche course.
Most people are
caught in slab avalanches. A slab is a large area of cohesive snow which
separates from more stable snow or ground cover, leaving a well-defined fracture
line. Slab avalanche potential exists when relatively strong, cohesive
snow overlies weaker snow or is not well bonded to an underlying layer.
Research the
route and its hazards; known slides, cornices, cliffs and crevasses.
Check the
weather and avalanche danger. Have an alternate trip choice.
Consider group
makeup. Beacon compatibility, experience, fitness level and group size.
If You are Caught in an Avalanche:
- Keep a light pack on
- Discard a heavy pack
- Discard all other equipment
- Make swimming motions
- Stay on top
- Work your way out to the side
- Before coming to a stop make an
air pocket in front of your face
- Try to dig out
- Push an arm up
- To determine which way is up spit.
IT
IS EASIER TO AVOID
AN
AVALANCHE
THAN
TO SURVIVE ONE
VICTIMS
HAVE LESS THAN 30 MINUTES OF AIR
** This information was taken from the Canadian Avalanche
Centre's pamphlet on avalanches.
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