Difference between revisions of "Avalanche character definition table"

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|-
 
|-
 
|'''Loose Dry'''
 
|'''Loose Dry'''
|Various (no cohesion)
+
|Various<br/>(no cohesion)
 
|None
 
|None
 
|Hours/days
 
|Hours/days
Line 16: Line 16:
 
|Down slope entertainment
 
|Down slope entertainment
 
|R1-2
 
|R1-2
 +
|-
 +
|'''Loose Wet'''
 +
|Various<br/>(no cohesion)
 +
|None
 +
|Hours/days
 +
|Any level
 +
|Significant down slope entrainment
 +
|R1-3
 +
|-
 +
|'''Wind Slabs'''
 +
|DF, PP
 +
|4F-K<br/>wind transported
 +
|Hours/days
 +
|Upper pack
 +
|Terrain features
 +
|R1-3
 +
|-
 +
|'''Storm Slabs'''
 +
|PP, DF
 +
|F-P<br/>Soft-stiff
 +
|Hours/days
 +
|In or just below storm snow
 +
|Path
 +
|R1-4
 +
|-
 +
|'''Wet Slabs'''
 +
|Various
 +
|4F-P<br/>Wet grains
 +
|Hours/days
 +
|Midpack to deep
 +
|Path
 +
|R1-5 (climax)
 +
|-
 +
|'''Persistent Slabs'''
 +
|PWLs such as SH, FC, CR, FC/CR combo
 +
|4F-P<br/>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<br/>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
 +
|}
 
|}
 
|}

Revision as of 16:20, 29 December 2013

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

|}