Above Tree Line East and South Aspects

Location Name: 
Above Tree Line East and South Aspects
Region: 
Williams Lake Area
Date and time of observation: 
Fri, 01/03/2020 - 12:00


Red Flags: 
Recent loading by new snow, wind, or rain

Observation made by: Professional Observer
Snowpit Observations
More detailed information about the snowpack: 

Went for a tour to check out some east facing slopes that had previously avalanched as well shallow south facing slopes above treeline. We continue to find a poor snowpack structure, especially in places where the snowpack is shallow. Where we have a cohesive slab from the end of December storms, we are finding small grained facets underneath. (See Video) This failed under moderate force. Deeper down basal slabs are decomposing, as rounds are beginning to facet. We also found 1-2mm basal facets. The two inches of low density snow that fell on Thursday still remained in wind sheltered areas. Northwest winds picked up in the early morning hours friday, and were enough to transport snow from the north aspects onto southerly slopes. We were finding stiffening wind slabs on the surface, that in some places did not appear to be bonding well to the old existing surface. 

Photo 1: Northwest winds scoured slopes at high elevations, creating wind slabs on leeward slopes.    

Snowpit or crown profile photo or graph: 
Snowpack photos: 
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
Clear
Air temperature: 
Below Freezing
Wind Speed: 
Light
Precipitation: 
None
Air temperature trend: 
Warming
Wind Direction: 
Northwest
Accumulation rate: 
None
More detailed information about the weather: 

A cold, clear morning warmed quickly into the low 20's. The sun quickly warmed solar aspects. Moderate northwest winds transported snow at high elevations from ridgelines. Winds calmed down as the day progressed. No precip.