Manto nivoso

Mammoth Lakes Basin - "Make a dragon wanna retire, man"

Clancy NelsonEastside Region
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Quick report

After some surficial overnight freezes, and more expected, I wanted to dig into the snowpack to see how deep things were getting wet.

A few natural rollerballs by noon. I could trigger very small wet loose avalanches with ski cuts and shovel bombs. Rollerballs were easy to kick off by 11:30 am.

Weather

Air Temp
40s and 50s
Cloud Cover
few
Wind Loading
none
Snow Avail For Transport
none

Light southwest winds and clear skies with a few clouds developing by midday. Hot.

Snowpack

  • The weak snow from January has gotten wet near the bottom of the snowpack. I didn't get any notable test results on this layer. (Note that in my snow profile, I forgot to label the bottom layer as wet, but it was pretty slushy.)
    • With much probing on north and east-facing terrain near treeline, the snow depth and general structure in my snow pit seemed relatively common in the areas I traveled.
  • This morning, a 5-25 cm thick surface melt-freeze crust started to become unsupportable by 9 a.m. in all areas except true north and northwest above about 9800 ft, which were still frozen when I exited around noon.
  • Much of the snowpack was moist or wet where I looked except on true north and northwest above about 9800 ft. where there was dry snow under the surface crust. I didn't find anywhere near or above treeline where the whole snowpack was isothermal and homogenous. It's still layered; it's not a summer snowpack yet.
  • See profile and photo captions for more details.