Difference between revisions of "Avalanche character definition table"
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|class="Header"|Comment | |class="Header"|Comment | ||
| − | |Typical failure plane | + | |class="Comment"|Typical failure plane |
| − | |Typical kind of slab | + | |class="Comment"|Typical kind of slab |
| − | |Typical duration of instability | + | |class="Comment"|Typical duration of instability |
| − | |Relative to HS | + | |class="Comment"|Relative to HS |
| − | |Typical expectation | + | |class="Comment"|Typical expectation |
| − | |Typical range of size relative to path | + | |class="Comment"|Typical range of size relative to path |
|} | |} | ||
Revision as of 15:28, 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 |
