Public Observation - Snowpit from Peak 6996 (Sub Shields), Glacier National Park

Location Name: 
Public Observation - Sub Shields, Glacier National Park
Region: 
Glacier National Park - Southern Lewis Range
Date and time of observation: 
Wed, 01/11/2017 - 13:00
Location Map: 

Red Flags: 
Recent loading by new snow, wind, or rain
Observation made by: Public
Snowpit Observations
More detailed information about the snowpack: 

Surface snow was generally low-density, unconsolidated snow at all elevations. On the ridge, we found atypical patterns of loading and scouring on multiple aspects. Occilating wind direction has made it difficult to conclusively say which aspect is lee -- see photo for "competing" cornices at mid elevation.  At the photo location and below nearby ridges, we did notice evidence of cornice falls. We did not observe clear evidence of these cornice falls triggering additional avalanche activity. With fantastic visibility, we also failed to see any avalanche activity in slide paths surrounding the Shields/Elk area. 

Snowpit was dug at approximately 6800' on a generally SE aspect. Total snow depth was 150 cm. Looking at snow hardness in the pit, we did not find an "upside-down" snowpack in the top meter. There was a thin, weak layer topped by 1-finger snow at 75 cm above ground. 

Test results recorded in cm above ground.

Compression test: numerous CTE failures in top 5 cm. CT5@135 Q3. CT10@125 Q3. CT12@110 Q1. CT14@103 Q2. CT19@75 Q1.

Extended column test: ECTN6@135. ECTN11@125. ECTN15@115. ECTN21@108. ECTN25@90. 

Though the extended column test did not cause a failure in the weak layer at 75 cm, further unscientific hammering did result in failure with full propagation.

Snowpack photos: 
Weather Observations
Blowing Snow: 
No
Cloud Cover: 
Clear
Air temperature: 
Below Freezing
Wind Speed: 
Calm (No air motion)
Precipitation: 
None
Air temperature trend: 
Warming
Wind Direction: 
Northeast
Activity: 
Skiing
High Temp. (C): 
-21
Low Temp. (C): 
-30