I dug the snowpit profiled above on a west aspect to gain more information based on an avalanche previously observed by Dave Garcia. Westerly aspects have been a bit of a wild card this season. I located a similar, but non-reactive weak layer that produced this avalanche. Results were ECTX even on the basal facets. It was dug at about the same elevation and about a quarter mile up canyon. I also dug a pit on a WSW aspect several hundred feet higher. A stout crust/facet combination exists below the snow that fell over the past 10 days. An ECT produced no results.
I'm adding this photo of an avalanche on the north face of Mount Mellenthin that I observed during GCSAR training Saturday, Feb 10, just because I haven't documented it yet. And it's a cool photo ;) It's hard to see, but the crown runs all the way down to the lower shoulder of the ridge on the observer's right.