Sherwins - Mammoth Rock Bowl

SNOWPACK OBSERVATION
Sherwins - Mammoth Rock Bowl
Submission Info
Forecaster
Monday, January 23, 2017 - 4:00pm
Red Flags: 
Recent loading by new snow, wind, or rain
37° 36' 32.8752" N, 118° 59' 27.7152" W
Snowpit Observations
More detailed information about the snowpack: 

-Toured up from the end of Old Mammoth Rd past Mammoth Rock assessing snowpack, being cautious to avoid steeper wide open areas, up to ridgeline.

-Mammoth Rock Chute slid with stomping at starting zone.  1.5-2ft crown dense soft slab.  42 degrees is upper slope steepness, windloaded.  

-Multiple hand pits failed with moderate force with Q2 - Q1.5 shear quality, at density change in new snow ... most noteably failures occured above a very thick 1Finger hard layer in a 4finger layer (which was overtopped by light fist hard snow).  Right-side-up snowpack.

-Quick test pit dug a couple hundred feet below ridge on 30 degree slope, see attached profile.  ECTP21 at same density cahnge as above hand pits, 50cm down.    

-Some small shooting cracks at steep convexities.

-Calm winds, except at ridgetop where moderate south winds were blowing (very cold!).  These winds were forming small cornices which were failing frequently and not getting too large.  

-Stayed in terrain less than 35deg .... terrain over 40 degrees (especially if windloaded!) could produce avalanches, as seen above in poop chute.  

 

 

Snowpit or crown profile photo or graph: 
Weather Observations
More detailed information about the weather: 

Mostly calm winds, except moderate S at ridgetop.  Cold temps in the low teens.  Snowing mostly lightly with a few periods of moderate intensity.

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