Isothermal, wet facets, rotglop, elephant snot, etc. It goes by many names and you won't forget it if you've dealt with it. We've been dealing with a bit of it here in JH recently. Particularly at low elevation, where our thinner, thoroughly faceted snowpack has gotten wet after consecutive nights above freezing.
Check out this vid from another Greater Yellowstone range. These guys were having fun with a small test slope, in this case, a road cut. As you can imagine, on a larger scale or with a terrain trap, it wouldn't be fun anymore! Note the small trigger getting solid results.
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