Blowing snow and fresh wind deposits made for touchy D1 wind slabs in some NTL lee start zones. Small cornices from today’s wind were also touchy.
Went out to McGee Mountain to investigate a recently reported large natural slab avalanche that failed on 3/11 or 3/12. We have seen some impressive crowns, but wanted to check if the Feb. PWL was the culprit, or if this was just a deep wind slab at a stomr interface. I wanted to know if the Feb. facets were still producing avalanches ahead of the next round of loading.
This avalanche fits a pattern of deep slab activity that has continued in the past 48 hours despite decreasing loading. The Feb. PWL is still sensitive to larger triggers. In this case the trigger was likely a natural cornice fall triggering a large wind slab in the upper storm layers that then stepped down.
Moderate blowing snow at ridges.
|Small touchy wind slabs forming below ridges today.