The photo on the right is from a snowmobile triggered avalanche on Crown Butte on 11-26. The photo on the left shows a nearly identical snowpack on nearby Scotch Bonnet Mtn the same day where a stability test broke on facets near the ground (ECTP 17). A similar layer of facets produced the human triggered avalanche on Crown Butte. Slopes with recent avalanches are clear evidence that similar slopes with a similar snowpack structure are prime places to trigger more avalanches. Photo: GNFAC
Advisory Year