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Avalanche
Avoidance
Avalanches
are naturally occurring movements of snow that occur when a snowpack
is destabilized. They occur in Canada especially at slopes that
are ironically best for skiing including double black diamond runs.
Many
groomed ski hills are safe because ski patrols constantly monitor,
assess and make recommendations. Back country skiing is not as safe.
Manitobans traveling to new slopes should avoid back country situations
unless accompanied by skilled locals who know those slopes.
Avalanches
kill people by blunt trauma and suffocation. Buried survivors do
have a chance of rescue providing other survivors and dogs can locate
them before they run out of time.
The
problem with rescue is that even when dug out immediately many victims
have died from the initial trauma. So more effort needs to go into
focusing on avoiding triggering and being caught in avalanches than
surviving them
Physical
signs in the environment- trees with half their braches missing
(‘avalanche flagged”), and runways with no trees are dead giveaways
that avalanches happened there before and are likely to happen again.
Changes
in snowpack destabilize it, making ski travel a bad idea. Rapid
thawing or freezing, and recent heavy precipitation (snow and rain)
all make the bonds between layers of snow more unstable.
Stepping
on snow and hearing a “whoomph” sound from a pocket of air is a
very bad sign and skiers should proceed directly to après-ski
time
If
caught in an impending avalanche kick off restrictive bindings and
roles as they limit your ability to struggle.
Don't
try to outrun an avalanche since you can't- instead move to the
side trying to get out of the main path. Vegetation and trees may
also slow down the avalanche some.
Avalanches
start as liquid so fight to stay above by swimming. As the avalanche
slows the snow will quickly turn ice hard. Struggle to keep your
feet first. As soon as the snow stops clear airspace around your
face and stick one arm up (which rescuers might see).
Proper
search and rescue is a specialized skill that has to be taught.
In Manitoba this isn't a priority but travelers intending to do
extensive winter outdoor travel might consider this.
I
took an avalanche course in Utah which included avalanche beacon
rescue ad have included notes on this n my website (below) These
courses are frequently run at ski destinations. Interested readers
can also contact the Canadian ski patrol.www.cpps.ca.
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