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Grey Butte

Submitted by abeverly on Thu, 03/23/2017 - 6:21am
Location Name: 
Grey Butte
Region: 
Mt. Shasta
Location Map: 
United States
41° 20' 43.944" N, 122° 11' 44.052" W
US
Date and time of observation: 
Wed, 03/22/2017 - 11:45am
Observation made by: 
Professional Observer
Snowpit Observations
More detailed information about the snowpack: 

Tour of Grey Butte saw 9 to 11 inches of new snow since Monday. Above freezing temperatures up to at least 8000' were changing snow conditions on all aspects quickly. New snow was becoming heavy and sintered. Expect zipper crusts on Thursday.

Winds were calm and little sign of wind effect was observed below 8000'.

Small natural avalanches (D1) were seen on eastern aspects of Sun Bowl and Green Butte. Two were wind slab avalanches, one appeared to be a loose dry point release.

Test pit was dug on NE aspect of Grey Butte just below the weather station. Fist hard rain effected layer was discovered 48 cm down and 36 cm thick. Seemed very weak but no compression failures were seen here. Shovel shear test pulled ECT block out at this layer. Test results: CT13 @ 21 cm, ECTN18 @ 21 cm. 

Skiing on west aspect in trees produced a lot of roller balls from the top 20 cm of snow. Skier reported skiing the chute just to the right of the trees on the west aspect below the weather station and saw no signs of instability.

 

Snowpit or crown profile photo or graph: 
Weather Observations
Blowing Snow: 
No
Cloud Cover: 
75% of the sky covered by clouds
Air temperature: 
Above Freezing
Wind Speed: 
Calm
Precipitation: 
None
Air temperature trend: 
Warming
Accumulation rate: 
None