Mammoth Lakes Area Observations

Sherwins, Mammoth Backcountry and Lakes Basin
Submission Info
Tuesday, December 31, 2019 - 1:30pm
37° 36' 6.696" N, 119° 1' 1.182" W
Snowpit Observations
More detailed information about the snowpack: 

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20191231 AIARE 1


We had three groups in the field today.  One in the Mammoth Lakes Basin.  One in the Sherwins and a third in the Mammoth Mountain Sidecountry/Hemlock Ridge area.


Mammoth Lakes Basin Group Obs

Cold winter snow on the surface in all sheltered areas.  20-25cm HST on flat, east, south and gentle west slopes


On steeper southerlies there started to be hints of temperature and solar impacted snow.


Active wind transport visible along the crest. Especially on Ship’s Prow.


On the NW slopes of the Lake George Ridge facing Horseshoe lake. 9200 feet. HS 105. HST of 45-50cm some wind deposition possible, but not windslab formation.  Hand shears were stubborn and non-planar on the crust.


SE Aspect at 9200 feet.  HST 25cm. HS 90cm With stubborn hand shears failing under the top crust at 30cm. Failure on Facets 1-2mm


WSW Aspect 8980 feet HST 20cm

HS 85. Crust is much stiffer here.


Easier hand shear. ct showed moderate to hard results that were non planar.


Solar and temp starting to impact surface condition.


For Sherwins and Mammoth Side Country Obs see photo.

Snowpit or crown profile photo or graph: 
Any other comments about the observation or links to outside pages that have more info on the observation: 

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Weather Observations
Blowing Snow: 
Cloud Cover: 
25% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: 

Clear skies in the morning and then clouding over a little along the Mammoth Crest in the afternoon.  Solar radiation and warming was felt on the south facing slopes, but temps remained crisp in the shade.  No significant wind for transport down low, but flagging was present all along the crest.

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