Public Observation #2022-581

Submitted:
January 10, 2022 5:40 PM
Observation Date:
January 10, 2022
Zone or Region:
Central Cascades
Activity:
Skiing/Snowboarding
Location:
Tumalo -west side at tree line
Did you see shooting cracks? 
Yes
Did you experience collapsing or whumpfing? 
Yes
Some new snow this morning. Below tree line - snow was anywhere between 1-3 inches, without any noticeable wind effect. Below this layer of snow, there was supportable crust from the parking lot all the way up the skin track.

Sastrugi appeared at tree-line, showing south through west winds. On south and west aspects, the surface was scoured in places, with pockets of soft snow. There is a significant crust layer anywhere between the surface and 6 inches deep, depending on whether the local surface had been scoured by winds.
This crust layer did not break under skis, but did break under boots. Upon digging, it appears to not be bonding very well with the 4f layer below it. It easily broke away upon cutting or even low taps on a compression test. I had expected the bonding to be stronger between those layers, but found it to be rather poor.