Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 3
Over the last week we have had 2'-4' feet of snow. The start of this storm is marked by a layer of dirt that is harboring weak faceted snow. This layer is not yet settled out and yesterday we had reports of riders triggering avalanches failing on this dusty interface. The other layer of concern is the same one we have been talking about since the Holidays. This layer of sugary faceted snow formed near the ground and has been the culprit in a number of avalanche fatalities in Utah this season. This layer near the ground will now be 2'-4' deep and any avalanche failing here would be large enough to bury, injure, or kill a person. Slopes that are most likely to holding this layer are thinner, shallower, and have potentially already avalanched a couple of times this season (repeaters). The best way to find out if this layer exists is to take your probe out and check snow depths before committing to steep terrain.
Photo (Manship and Collet) showing the dirt layer now buried 2'-4' below the surface.