Close
Missoula Avalanche

Professional Observation

Basic Information

Observation Details

Observation Date:
December 27, 2021
Submitted:
December 27, 2021
Observer:
WCMAC - Ryan Sorenson and Ryan Milling
Zone or Region:
Missions
Location:
North of upper Jocko Lake

Signs of Unstable Snow

Recent Avalanches? 
None Observed
Cracking? 
Isolated
Collapsing? 
None Experienced
We noticed minor cracking in the top 12 inches (35 cm) on wind-loaded test slopes.

Snow Stability

Stability Rating: 
Fair
Confidence in Rating: 
High
Stability Trend: 
Steady

Bottom Line

Today we went into the Mission Range to look for signs of wind slab and persistent instabilities.

The winds were calm for most of the day. There was a light westerly breeze on the ridgetop at 7000 feet. Light snow showers would move in and out.

• We observed a few minor loose dry sluffs with ski cuts in steep terrain. The snow that was entrained was isolated to the top 12 inches.
• We experienced localized cracking around our skis on small wind-loaded test slopes.
• Well-developed cornices have formed on steep north and east-facing ridgelines.
• Plenty of loose snow is available for transport if winds increase.

Media

Advanced Information

Weather Summary

Cloud Cover:
Overcast
Temperature:
10° F, -12° C
Wind:
Light , SW

Snowpack Observations

We dug a pit on a protected north aspect looking for lingering persistent layers. We found the basal facet crust layers are bonding well in this area.

Close