Close
SIMPLE OBSERVATION FORM
 Date: 03.18.18
 Location:  South of Copper Zone/Region:  Banner Summit
 Activity:   Skiing
AVALANCHES TRIGGERED
 Was it intentional?  yes
 What type of avalanches?   Soft Slab
 What size?
 Size 2: Could bury, injure, or kill a person
 What Elevation?  8500'
 What Aspect?   NE
 Comments: We encountered a third type of avalanche problem (besides wind slab and dry loose): storm slab. Two skiers ski cut the top of a steep (45 degrees), sheltered, NE slope, and the second ski cut triggered a D2 soft slab that broke on small faceted grains. The day before, March 17, two immediately adjacent parallel features had naturally sluffed (dry loose) without any slab characteristics. By March 18, the prior three days of storm snow had settled/consolidated into a 25 cm slab that rested on small faceted grains likely created during the clear nights prior to the latest storm cycle. By following protocol, and maybe with some residual luck of the Irish, neither skier was carried by the slab release.
AVALANCHE OBSERVATIONS
 How Many?  2
 Trigger:   Natural
 What type of avalanches?   Dry Loose (sluff)
 What size?
 Size 1: Relatively harmless to people
 What Elevation?  8500'
 What Aspect?   NE
 Comments: From March 17.
FILE ATTACHMENTS

IMG_1954.JPG

IMG_5953.JPG

IMG_5957.JPG