Poor snowpack test scores and widespread collapsing indicated that the snowpack in this area seemed worse than observed elsewhere in the Banner Summit zone. The weak facet layer is buried beneath an 18-20" thick, dense slab.
Generally overcast, but occasionally obscured. There was one brief period when the sun poked out. Ski pen around 20cm.
Was surprised by the widespread collapsing given the lack of recent loading. Collapsing seemed most widespread on E and ESE aspects where there were more distinct crusts present in the slab and a weakening crust near the 12/11 facet layer. Hard to confirm/deny this theory with the little data we had. Collapsing was less common on NE and at higher elevations where the slab was thicker, stronger, and likely more difficult to impact the weak layer.
@8100', NE: HS 105cm. 12/11 down 55cm. Slab 1F hard at base over F/F+ FC. ECTP21.
@7700, ESE: HS 95cm. This slope collapsed as we approached it. 12/11 down 50cm. Slab 4F hard at base over F FC - weaker than first pit. There was a thicker crust from the solstice rain, and a few other crusts below it in the slab. There was also a very faint/deteriorated crust just above 12/11. ECTP13 just below that crust. I think these crusts were playing a role in the collapsing on the E and ESE aspects.
Layer Depth/Date: 50-55cm
Weak Layer(s): Dec 11, 2020 (FCsf)
Comments: Collapsing most widespread on E and ESE. Propagating ECTs on N and ESE.
Went out planning to avoid terrain over 35*. Widespread collapsing caused us to step back, and we basically avoided avalanche terrain.