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Missoula Avalanche

Professional Observation

Basic Information

Observation Details

Observation Date:
December 7, 2021
Submitted:
December 7, 2021
Observer:
WCMAC - Ryan Sorenson and Jeff Carty
Zone or Region:
Rattlesnake
Location:
Sheep Mountain

Signs of Unstable Snow

Recent Avalanches? 
None Observed
Cracking? 
None Experienced
Collapsing? 
None Experienced

Snow Stability

Stability Rating: 
Good
Confidence in Rating: 
High
Stability Trend: 

Bottom Line

We went back to Sheep Mountain today to see what has changed over the last week.
• The new snow fell over bare ground below approximately 6,700 feet.
• We found 15 inches of old snow remaining at 7,000 feet, where we dug a quick pit. There are eight inches of newer snow above that.
• Early season hazards are abundant, including downed trees, barely covered rocks, and bushes.
• An ice crust, formed by freezing drizzle today, is present from 6,000 to 7,000 feet and likely higher. We'll keep an eye on this layer as it could cause issues once it gets buried.

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Advanced Information

Weather Summary

Cloud Cover:
Overcast
Temperature:
26.5
Wind:
Light , SW

We noted near-freezing temperatures at the trailhead, and snow surfaces were moist. The sky was overcast but light gray with various cloud layers; some hung lower as fog on the nearby peaks. We traveled through a few freezing drizzle showers as we made our way up to 7,000 feet. The ice lens limited the availability for snow transport, but winds were light with occasional moderate gusts out of the southwest.

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