By recognizing the advantages and disadvantages of each test, we feel that this combination gives us the best available tool to assess the snow stability. In addition to the stability tests we have begun qualitatively assessing shear quality, and we also feel this allows us to better interpret and communicate results. Slab typically slides easily into the snow pit after weak layer failure on slopes steeper than 35 degrees, and sometimes on slopes as gentle as 25 degrees. Shear plane may have some small irregularities, but not as irregular as Q3. Shear failure occurs through the whole block being tested, and slab may or may not slide into snowpit.
Shear plane is uneven, irregular or rough.
Shear failure may not occur through the whole block being tested. After weak layer failure, slab moves little, or may not move at all, even on slopes steeper than 35 degrees. Spatial and temporal variations in snow stability and snowpack conditions throughout the Bridger Mountains, Montana. PhD Dissertation, Department of Geography, Arizona State University, Tempe, Arizona. Birkeland, K.W., R.F. Johnson and D. Herzberg.