Mammoth Area - Mammoth Crest- snow conditions

Mammoth crest and Mammoth Pass area
Submission Info
Saturday, December 28, 2019 - 1:00pm
Mammoth crest 37° 36' 12.2976" N, 119° 2' 8.6964" W
Snowpit Observations
More detailed information about the snowpack: 

With all the north wind we have been receiving, decided to check out some southerly aspects to see what was going on. Didn’t venture on to anything real steep, but on moderate 30deg slopes found some pockets of wind slab that were not very reactive. I got some minor cracking and no downward movement when I stomped on wind loaded pillows. Where sheltered and especially below tree line, skiing was really good on the sunny aspects today. Also coverage was improved for the time being with all the transported snow laid down from yesterday’s strafing of the northerlies.

Got up on to north aspects of the Mammoth crest as well where the winds have piped much of the steeper northerly terrain, but really just the features above treeline that didn’t have any sheltered terrain. There was still good surface conditions in the sheltered north-east terrain.

Upon digging a snowpit, still found the Dec 12 rain crust ~50cm below the surface and a surface hoar layer ~80cm below the surface. Neither layer reacted in Compression Tests or Extended Column Tests. I performed a Deep Tap Test on the surface hoar and did get a sudden planar result on DT21. So it took some force, but it did shear very cleanly. This snowpit was dug in the same area where I found the surface hoar on Dec 15th only on the opposite side of the bowl on a NW aspect instead of the NE. We haven’t been finding surface hoar in other areas, but something to keep in the mental data log.

Solar aspects sheltered from the breeze by the end of the day were getting wet and a temperature crust was already setting up in the shade. Although it was pretty cold while in the wind today, overall air temperatures were hovering around 32deg. It felt warm in the Lakes Basin as I egressed out.


Snowpit or crown profile photo or graph: 
Snowpack photos: 
Snowpit videos (tests, etc): 
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