| Trigger | Snowmachiner | Remote Trigger | No |
| Avalanche Type | Soft Slab | Aspect | West |
| Elevation | 900ft | Slope Angle | 35deg |
| Crown Depth | 22in | Width | 50ft |
| Vertical Run | unknown |
Avalanche: Turnagain
Location: Bertha Creek (Turnagain flats)
Field day in the flats, south of the motorized lot. Great day for an avalanche class as it was quite easy to see/ experience storm slab/ persistent slab instabilities where we were, in no consequence terrain.
Avalanche Details
Multiple storm slabs triggered on small test slopes in the flats, south of the motorized lot.
Obvious signs of instability
| Recent Avalanches? | Yes |
| Collapsing (Whumphing)? | Yes |
| Cracking (Shooting cracks)? | Yes |
Observer Comments
Whumpfing, shooting cracks and recent avalanches.... the trifecta!
Weather
5 deg F at 1,000'. Sunny. winds were calm in the flats. Large plumes visible on peaks in Portage Valley, Placer Valley Twentymile Valley, and Seattle ridge. Blowing from NNW.
Snow surface
Deep, unconsolidated storm snow. Very little wind effect at this elevation thru Turnagain Pass today.
Snowpack
Loc: Near Bertha Creek, south of moto lot
Ele: 900'
Asp: West
slope: 16 deg.
Test results: EXTP12-17 x 5
Consistent failure and propagation on the top of the January facets.
Active wind transport this morning in Portage Valley. Bard Peak. photo: Sully
AK Avalanche School moto Level 1 in the snowpit, checking out the facet factory from January clod snap. photo: Sully