Difference between revisions of "Avalanche character definition table"
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| Line 9: | Line 9: | ||
|class="Header"|Relative Size Potential | |class="Header"|Relative Size Potential | ||
|- | |- | ||
| − | | | + | |class="Class"|Loose Dry |
|Various<br/>(no cohesion) | |Various<br/>(no cohesion) | ||
|None | |None | ||
| Line 17: | Line 17: | ||
|R1-2 | |R1-2 | ||
|- | |- | ||
| − | | | + | |class="Class"|Loose Wet |
|Various<br/>(no cohesion) | |Various<br/>(no cohesion) | ||
|None | |None | ||
| Line 25: | Line 25: | ||
|R1-3 | |R1-3 | ||
|- | |- | ||
| − | | | + | |class="Class"|Wind Slabs |
|DF, PP | |DF, PP | ||
|4F-K<br/>wind transported | |4F-K<br/>wind transported | ||
| Line 33: | Line 33: | ||
|R1-3 | |R1-3 | ||
|- | |- | ||
| − | | | + | |class="Class"|Storm Slabs |
|PP, DF | |PP, DF | ||
|F-P<br/>Soft-stiff | |F-P<br/>Soft-stiff | ||
| Line 41: | Line 41: | ||
|R1-4 | |R1-4 | ||
|- | |- | ||
| − | | | + | |class="Class"|Wet Slabs |
|Various | |Various | ||
|4F-P<br/>Wet grains | |4F-P<br/>Wet grains | ||
| Line 49: | Line 49: | ||
|R1-5 (climax) | |R1-5 (climax) | ||
|- | |- | ||
| − | | | + | |class="Class"|Persistent Slabs |
|PWLs such as SH, FC, CR, FC/CR combo | |PWLs such as SH, FC, CR, FC/CR combo | ||
|4F-P<br/>Stiff-hard | |4F-P<br/>Stiff-hard | ||
| Line 57: | Line 57: | ||
|R2-4 | |R2-4 | ||
|- | |- | ||
| − | |Deep Persistent Slabs | + | |class="Class"|Deep Persistent Slabs |
|PWLs such as DH, FC, CR, FC/CR combo | |PWLs such as DH, FC, CR, FC/CR combo | ||
|1F-K<br/>Hard | |1F-K<br/>Hard | ||
| Line 65: | Line 65: | ||
|R3-5 (climax) | |R3-5 (climax) | ||
|- | |- | ||
| − | | | + | |class="Class"|Cornice |
|~ | |~ | ||
|~ | |~ | ||
| Line 73: | Line 73: | ||
|~ | |~ | ||
|- | |- | ||
| − | | | + | |class="Header"|Comment |
|Typical failure plane | |Typical failure plane | ||
|Typical kind of slab | |Typical kind of slab | ||
Revision as of 16:22, 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 |
|}
