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ADVANCED OBSERVATION FORM
 Start Date: 01.17.19
 Drainage/Route:  Copper Observed Terrain:  7,000-8990 S-W-N Zone/Region:  Banner Summit
WEATHER OBSERVATIONS
 HN24: 30cm HST: Sky: VAR Precip: S1 Temps: 25
 Ridgeline Wind: Strong and Steady from the SW
 Blowing Snow: I Snow Available for Transport: Large amounts
 Comments: The wind was blowing so hard mid to upper mountain it sounded like a freight train sometimes. The perception came down in forms of snow and graupel
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 1 North side of Copper off the top Today 1 N N 8990 Lighting wasn’t great with all the blowing snow but it looked to have a crown right below the cornice off the summit. It was really hard to tell because the new transported snow had filled it mostly back in. It probably released mid storm last night or early morning.
 1 Mid slope of what people call Jack’s about 8400ft Today 3 HS AS SW 8400 This slide was remotely triggered while we were getting ready to cut our block for an ECT test. It broke about 90 ft below us. Crown is about 3-4ft and 150ft wide and it ran it’s intire track down to the bottom creek where it rounds the corner. This one a peirs to have riped to the ground on the persistent weak layer of DH 1mm of 30 cm that sit at the bottom of snowpack in this location.
SNOWPACK OBSERVATIONS
 HS: 110 
 Upper Pack: 30 cm of new snow  
 Middle Pack: A couple small 1cm layers of facets probably buried SH but snow pack was 4F down into 1F no thick or strong crusts  
 Lower Pack: Bottom 30 cm is the DH 1mm still had very sharp edges to them.  
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:
80

Likelihood of Triggering
Sensitivity:
Reactive

Spatial Distribution:
Widespread
Where did you find this problem?
  Primary Concern Comments: 
STABILITY TESTS
 Stability Test Results: Was getting ready to do an ECT but then the remote triggering of the Avalanche made us grab our things and move out.
SNOW STABILITY
 Snow Stability Rating for your observed area: Fair Confidence: LOW Trend: Worsening
 Comments (aspects and elevations of instability, etc): With how much snow was being transported in this area today I was be very careful out there and stay away from slopes steeper then 35 degrees.
BOTTOM LINE
 Comments: There are many slopes out there especially in this area that people feel probably to comfortable with the glades in this area do have some big roll over areas that can and will slide. The slope that remotely triggered is a slope a lot of people just ski not thinking about it. Please reassess slopes before skiing or riding them. Especially this weekend as more snow and wind will load these areas.
FILE ATTACHMENTS

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Shows the mid slope release

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Snow being transported