Difference between revisions of "Avalanche character definition table"

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|-
 
|-
 
|class="Class"|Persistent Slabs
 
|class="Class"|Persistent Slabs
|PWLs such as SH, FC, CR, FC/CR combo
+
|PWLs such as SH, FC,<br/>CR, FC/CR combo
 
|4F-P<br/>Stiff-hard
 
|4F-P<br/>Stiff-hard
 
|Weeks/months
 
|Weeks/months
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|-
 
|-
 
|class="Class"|Deep Persistent Slabs
 
|class="Class"|Deep Persistent Slabs
|PWLs such as DH, FC, CR, FC/CR combo
+
|PWLs such as DH, FC,<br/>CR, FC/CR combo
 
|1F-K<br/>Hard
 
|1F-K<br/>Hard
 
|Weeks/months
 
|Weeks/months
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|class="Comment"|Typical range of size relative to path
 
|class="Comment"|Typical range of size relative to path
 
|}
 
|}
 +
  
 
'''Source''':  
 
'''Source''':  
 
Statham, G., Haegeli, P., Birkeland, K. W., Greene, E., Israelson, C., Tremper, B., et al. (2010). ''A conceptual model of avalanche hazard''. Paper presented at the International Snow Science Workshop, Lake Tahoe, CA.
 
Statham, G., Haegeli, P., Birkeland, K. W., Greene, E., Israelson, C., Tremper, B., et al. (2010). ''A conceptual model of avalanche hazard''. Paper presented at the International Snow Science Workshop, Lake Tahoe, CA.

Revision as of 16:37, 29 December 2013

Identify the Avalanche Character(s) that best represents the avalanche problem(s) within the defined Location. When multiple characters exist, they should be prioritized in order of importance.

Character Weak Layer /
Interface
Slab Property Persistence Weak Layer
Location
Propagation
Potential
Relative Size
Potential
Loose Dry Various
(no cohesion)
None Hours/days Near the surface Down slope entertainment R1-2
Loose Wet Various
(no cohesion)
None Hours/days Any level Significant down slope entrainment R1-3
Wind Slabs DF, PP 4F-K
wind transported
Hours/days Upper pack Terrain features R1-3
Storm Slabs PP, DF F-P
Soft-stiff
Hours/days In or just below storm snow Path R1-4
Wet Slabs Various 4F-P
Wet grains
Hours/days Midpack to deep Path R1-5 (climax)
Persistent Slabs PWLs such as SH, FC,
CR, FC/CR combo
4F-P
Stiff-hard
Weeks/months Upper to midpack Path to adjacent path R2-4
Deep Persistent Slabs PWLs such as DH, FC,
CR, FC/CR combo
1F-K
Hard
Weeks/months Deep or basal Path to adjacent paths R3-5 (climax)
Cornice ~ ~ Months with short peaks ~ ~ ~
Comment Typical failure plane Typical kind of slab Typical duration of instability Relative to HS Typical expectation Typical range of size relative to path


Source: Statham, G., Haegeli, P., Birkeland, K. W., Greene, E., Israelson, C., Tremper, B., et al. (2010). A conceptual model of avalanche hazard. Paper presented at the International Snow Science Workshop, Lake Tahoe, CA.