Weak layers in snowpack are being pushed towards their breaking points. In areas with the right terrain characteristics, large triggers are capable of producing large avalanches involving the entire season's snowpack.
Afternoon weather obs. Broken to overcast skies, occasional periods of S-1 precip with no significant precipitation. Light to moderate westerly winds blowing at highway level and along ridges in exposed middle elevation terrain - calm otherwise.
4th of July Creek drainage
|D2||HS||O-Old Snow||50-90cm||N-Natural||Failed on facets 10-15cm off ground. Hard to be certain if there was snow on this slope prior to Thanksgiving storms, but I think there probably was. However, facets/DH at and below failure interface were fairly small (to 4mm), which seems on the small side for 11/26. No SH found at this interface. If I had to bet I'd say 11/26 was the culprit.|
Snowpack seems to be close to its breaking point where thin. Slide observed was triggered by a sizable cornice collapse, pointing to the need for a large trigger in current snowpack conformation.
Comments: Wind slabs existed in an isolated to widespread distribution in most of the terrain that I traveled through.
Layer Depth/Date: 11/26 and 12/7