Avalanche

Mammoth Lakes Basin - hard and slick

Steve MaceEastside Region
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Observation photo 1Observation photo 2Observation photo 3Observation photo 4Observation photo 5Observation photo 6

Quick report

I ventured into the lake basin to visit an area near the treeline where I had found well-developed surface facets prior to our last storm to evaluate the structure and see if I could find any signs of instability. I was not entirely successful in my search

  • No signs of instability were noted along my tour
  • I dug in at 9800' on a sheltered north-facing aspect.
    • The new snow is resting on older well-developed facets, and there is certainly potential to see avalanches on this interface as the overlying slab grows in size and consolidates.
    •  I did not see any overly concerning results in my tests today.
    • See profile for more information
  • surface conditions provided an interesting sliding experience today. Hard and slick crusts were widespread at all elevations I traveled on. For the most part, crusts were supportive and predictable. At lower elevations, particularly in sheltered trees, I found some pockets of world-class breakable crusts that made for challenging movement.

Weather

Air Temp
26
Cloud Cover
clear
Wind Loading
light
Recent Snowfall
0
Snow Avail For Transport
small smounts

Blue skies and very windy for most of the day. Cloud cover began to grow quickly after 2 pm, becoming overcast by 4 pm. Snow showers started in Mammoth around 330 pm, becoming S1 by 4 pm

Avalanche

Size
D1.5
Aspect
NE
Elevation
10500 ft

loose wet activity off the mammoth crest. likely occurred on 2/1