Upper Slate River obs

CBAC CBAC Observations

Date of Observation: 11/25/2021
Name: Eric Murrow

Zone: Northwest Mountains
Route Description: Purple ridge area. Ascended and descended through east and northeasterly terrain from 9,600 – 11,800 feet.

Observed avalanche activity: Yes
Avalanches: Observed a couple of natural avalanches that likely ran on Wednesday 11/24. Slab avalanches were above treeline in drifted terrain facing east or southeast. Appeared to only involve the most recent storm snow.
Weather: Beautiful Thanksgiving day. Temperatures rebounded quickly in the AM and winds remained light even at treeline on an exposed ridge. Storm total from the previous day was around 8 inches.
Snowpack: While traveling around a drifted easterly ridgeline, I found mostly soft drifts up to 18 inches thick. Did not experience any cracking or collapsing, but I avoided suspect terrain features with the most significant drifting. On easterly slopes near treeline, the recently drifted storm snow was resting on a fairly soft, 1-2cm melt/freeze crust. This crust was resting on fist-hard, faceted snow.  A generally poor-looking structure particularly if you found a slope with a thick drift resting above.  While descending below treeline I traveled through northeasterly terrain looking to see if I could produce Dry Loose avalanches but the storm snow has not faceted enough yet to produce any significant sluffing.