fbpx Tumalo Base and Summit CT and ECT | Central Oregon Avalanche Center (COAC)
Intense precipitation
Observation Date/Time:
Tue, Dec 22, 2020 - 2:30 PM
Cole Timm
Other / 7776'
Report Type:
Snow Conditions   No Avalanche Activity  
Travel Mode:
Ski or Snowboard  
Sky Conditions:
Scattered (3/8 - 4/8)
New Snow:
5cm cm

Written Report:
Performed compression test and ECTs at both the base and summit of Tumalo.

AT THE BASE in the trees (more for practice than anything else):
No fracturing or propagation.
Noticed two separate layers of crust within the top 15cm, just below
5cm of new snow that the area received overnight.

Dug a pit just below the summit entering the bowl, northwest facing.
No fracturing or propagation.
Similar to at the base we noticed two crust layers within the top 15cm, just below 5cm of new snow. Note that in the bowl, the wind loaded the the top 50 meters or so, resulting in more than 5cm.\
While it appeared that the rain had created multiple layers of crust, it had also helped everything bond. That said, the new snow had definitely not bonded to the crust, and had there been more new snow, I would be nervous about significant sluffing.
When I pulled apart the ECT column with my shovel at the end, the column fractured about 30cm below the surface.

We ended up skiing two laps in the bowl and noticed no additional signs of instability.