Difference between revisions of "Hazard rating definition table"

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==Definition==
 
==Definition==
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'''Avalanche hazard'''; '''avalanche danger''' is the potential for an avalanche(s) to cause damage to something of value. It is a function of the likelihood of triggering and the destructive size of the avalanche(s). It implies the potential to affect people, facilities or things of value, but does not incorporate vulnerability or exposure to avalanches.
  
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'''North American Public Avalanche Danger Scale'''<br/>
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==Avalanche Hazard Rating Scale==
 
Avalanche danger is determined by the likelihood, size and distribution of avalanches.
 
Avalanche danger is determined by the likelihood, size and distribution of avalanches.
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{|class="TblConceptualModel"
 
{|class="TblConceptualModel"
 
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|class="Header"|Danger Level
 
|class="Header"|Danger Level
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|class="Header"|Travel Advice
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|class="Header"|Likelihood of Triggering
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|class="Header"|Likelihood of Avalanches
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|class="Header"|Size and Distribution
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|class="Header"|Avalanche Size and Distribution
 
 
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|class="Class" style="background-color:#231F20; color:#ffffff;"|5 Extreme
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|class="Class" style="background-color:#231F20; color:#ffffff;"|5
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|Avoid all avalanche terrain
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|Natural and artificially triggered avalanches almost certain.
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|Natural and human triggered avalanche certain.
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|&gt; Size 3 avalanches are widespread.
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|Large and very large avalanches in many areas.
 
 
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|-
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|class="Class" style="background-color:#ED1C24;"|4 High
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|class="Class" style="background-color:#ED1C24;"|4
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|Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.
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|Natural avalanches likely; artificially triggered avalanches very likely.
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|Natural avalanches likely; human-triggered avalanches very likely.
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|Size 2-3 avalanches are widespread; or &gt; size 3 avalanches in specific areas.
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|Large avalanches in many areas; or very large avalanches in specific areas.
 
 
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|class="Class" style="background-color:#F7941E;"|3 Considerable
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|class="Class" style="background-color:#F7941E;"|3
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|Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative desicion-making essential.
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|Natural avalanches possible; artificially triggered avalanches likely.
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|Natural avalanche possible; human-triggered avalanches likely
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|&lt; Size 2 avalanches are widespread; or size 2-3 avalanches in specific areas; or &gt; size 3 avalanches in isolated areas.
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|Small avalanches in many areas; or large avalanche in specific areas; or very large avalanches in isolated areas.
 
 
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|class="Class" style="background-color:#FFF200;"|2 Moderate
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|class="Class" style="background-color:#FFF200;"|2
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|Heightended avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
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|Natural avalanches unlikely; artificially triggered avalanches possible.
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|Natural avalanche unlikely; human-triggered avalanches possible
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|&lt; Size 2 avalanches in specific areas; or size 2-3 avalanches in isolated areas.
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|Small avalanches in specific areas; or large avalanches in isolated areas
 
 
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|class="Class" style="background-color:#50B848;"|1 Low
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|class="Class" style="background-color:#50B848;"|1
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|Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
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|Natural and artificially triggered avalanches unlikely.
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|Natural and human-triggered avalanche unlikely.
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|&lt; Size 2 avalanches in isolated areas or extreme terrain.
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|Small avalanches in isolated areas or extreme terrain.
 
 
|}
 
|}
  
  
 
'''Source''':  
 
'''Source''':  
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Statham, G., Haegeli, P., Birkeland, K. W., Greene, E., Israelson, C., Tremper, B., et al. (2010). ''The North American public avalanche danger scale''. Paper presented at the International Snow Science Workshop, Lake Tahoe, CA.
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https://c.ymcdn.com/sites/www.avalancheassociation.ca/resource/resmgr/InfoEx/IAG_-_Hazard_Rating_&_Guidan.pdf
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See http://www.avalanche.ca/cac/bulletins/danger-scale.
 
  
 
==Related documents==
 
==Related documents==
 
*[[Hazard assessment module]]
 
*[[Hazard assessment module]]

Latest revision as of 13:02, 25 January 2017

Definition

Avalanche hazard; avalanche danger is the potential for an avalanche(s) to cause damage to something of value. It is a function of the likelihood of triggering and the destructive size of the avalanche(s). It implies the potential to affect people, facilities or things of value, but does not incorporate vulnerability or exposure to avalanches.

Avalanche Hazard Rating Scale

Avalanche danger is determined by the likelihood, size and distribution of avalanches.

Danger Level Likelihood of Triggering Size and Distribution
5 Natural and artificially triggered avalanches almost certain. > Size 3 avalanches are widespread.
4 Natural avalanches likely; artificially triggered avalanches very likely. Size 2-3 avalanches are widespread; or > size 3 avalanches in specific areas.
3 Natural avalanches possible; artificially triggered avalanches likely. < Size 2 avalanches are widespread; or size 2-3 avalanches in specific areas; or > size 3 avalanches in isolated areas.
2 Natural avalanches unlikely; artificially triggered avalanches possible. < Size 2 avalanches in specific areas; or size 2-3 avalanches in isolated areas.
1 Natural and artificially triggered avalanches unlikely. < Size 2 avalanches in isolated areas or extreme terrain.


Source: https://c.ymcdn.com/sites/www.avalancheassociation.ca/resource/resmgr/InfoEx/IAG_-_Hazard_Rating_&_Guidan.pdf

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