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Avalanches 101 | National Geographic


with terrifying speed an avalanche can

with terrifying speed an avalanche can Rumble down a mountain slope burying

Rumble down a mountain slope burying

Rumble down a mountain slope burying everything in his path under a lethal

everything in his path under a lethal

everything in his path under a lethal blanket of snow each year about 150

blanket of snow each year about 150

blanket of snow each year about 150 people in Europe and North America die

people in Europe and North America die

people in Europe and North America die from avalanches large ones can wipe out

from avalanches large ones can wipe out

from avalanches large ones can wipe out for it and erase a mountain abilities

for it and erase a mountain abilities

for it and erase a mountain abilities avalanches come in many forms some

avalanches come in many forms some

avalanches come in many forms some called Slough consists of sliding loose

called Slough consists of sliding loose

called Slough consists of sliding loose snow others called slab avalanches grow

snow others called slab avalanches grow

snow others called slab avalanches grow in large sections of the snowpack crack

in large sections of the snowpack crack

in large sections of the snowpack crack off and crash down the slope as snowfall

off and crash down the slope as snowfall

off and crash down the slope as snowfall it builds up layer upon layer with

it builds up layer upon layer with

it builds up layer upon layer with enough time the layers will harden and

enough time the layers will harden and

enough time the layers will harden and bond to one another but when layers

bond to one another but when layers

bond to one another but when layers formed we Claus any new snow falls on an

formed we Claus any new snow falls on an

formed we Claus any new snow falls on an unstable foundation and waits for right

unstable foundation and waits for right

unstable foundation and waits for right trigger avalanches are caused by sudden

trigger avalanches are caused by sudden

trigger avalanches are caused by sudden changes a heavy snowfall strong winds or

changes a heavy snowfall strong winds or

changes a heavy snowfall strong winds or a rapid change in temperature

a rapid change in temperature

a rapid change in temperature the shape and angle of the slope are

the shape and angle of the slope are

the shape and angle of the slope are important factors slopes over 60 degrees

important factors slopes over 60 degrees

important factors slopes over 60 degrees are usually too steep slopes under 25

are usually too steep slopes under 25

are usually too steep slopes under 25 degrees if you general the danger zone

degrees if you general the danger zone

degrees if you general the danger zone comes between 30 and 45 degrees just

comes between 30 and 45 degrees just

comes between 30 and 45 degrees just where people like to ski and sled 90% of

where people like to ski and sled 90% of

where people like to ski and sled 90% of avalanche victims died because they or

avalanche victims died because they or

avalanche victims died because they or someone with them accidentally trigger

someone with them accidentally trigger

someone with them accidentally trigger an avalanche contrary to popular opinion

an avalanche contrary to popular opinion

an avalanche contrary to popular opinion loud noises like yelling won’t trigger

loud noises like yelling won’t trigger

loud noises like yelling won’t trigger an avalanche in most cases it’s the

an avalanche in most cases it’s the

an avalanche in most cases it’s the sudden weight of a skier or snowmobile

sudden weight of a skier or snowmobile

sudden weight of a skier or snowmobile that makes the surface unstable then the

that makes the surface unstable then the

that makes the surface unstable then the Avalanche descends had speeds up to 80

Avalanche descends had speeds up to 80

Avalanche descends had speeds up to 80 miles an hour as winter sports become

miles an hour as winter sports become

miles an hour as winter sports become more popular avalanches pose more of a

more popular avalanches pose more of a

more popular avalanches pose more of a threat ski patrols now monitor popular

threat ski patrols now monitor popular

threat ski patrols now monitor popular slopes to prevent avalanches from ever

slopes to prevent avalanches from ever

slopes to prevent avalanches from ever happening

happening

happening cannons fire explosives as slam in the

cannons fire explosives as slam in the

cannons fire explosives as slam in the snow bats to trigger small avalanches

snow bats to trigger small avalanches

snow bats to trigger small avalanches before the build-up becomes a problem

before the build-up becomes a problem

before the build-up becomes a problem search and rescue teams practice

search and rescue teams practice

search and rescue teams practice locating and digging out people trapped

locating and digging out people trapped

locating and digging out people trapped underneath the snow

but ultimately it’s up to every person

but ultimately it’s up to every person to watch out when they’re on the slope

to watch out when they’re on the slope

to watch out when they’re on the slope so pay attention to the weather look for

so pay attention to the weather look for

so pay attention to the weather look for warning signs learn what to do in an

warning signs learn what to do in an

warning signs learn what to do in an emergency because everything can change

emergency because everything can change

emergency because everything can change in just a few seconds

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