Observation: Silver Fork

Observation Date
12/16/2021
Observer Name
T Diegel, P Diegel, Patterson, Higgins
Region
Salt Lake » Big Cottonwood Canyon » Silver Fork
Location Name or Route
Silver Fork
Weather
Sky
Obscured
Precipitation
Light Snowfall
Weather Comments
Despite the reports of all the high winds, we apparently have been in the wind sheltered areas the last 2 days, because it's been quite calm where we have been. So not much wind-loading (and the terrain doesn't lend itself to much wind loading).
Red Flags
Red Flags
Heavy Snowfall
Cracking
Collapsing
Red Flags Comments
On sheltered slopes there wasn't really a slab formed.
Avalanche Problem #1
Problem
New Snow
Trend
Decreasing Danger
Problem #1 Comments
I dug a quick pit at about 9500' E/NE facing and was a little surprised to see that the total 'pack was about 4' deep; more than I anticipated. The new snow came away from what I assume was a sun crust - and slab - from last week at about 15 taps, but not cleanly. It then broke again at the ground with moderate effort where the slab lay on the facets.
Avalanche Problem #2
Problem
Persistent Weak Layer
Problem #2 Comments
We did work on keeping our slope angles low; fortunately the new snow has settled out a little and it's light enough that it skied pretty fast, so low angle was all that was needed for fun. However, on our exit as I was photographing a skier coming by I got a big whoomph, dropped an inch, and had cracks ripple all around me (see pic). That was the only whoomph all day and fortunately it was on a <30 degree slope; basically it was an "avalanche" that didn't actually run.
The bottom of the run got steeper, but there was enough shrubbery and we were bouncing off the bottom - ie likely only new snow, with a bit more of a SE aspect - so we felt there was pretty good bonding for our exit. Of course, it'll still be skitchy for a bit, but at some point the snow may stack up enough that the PWL may not be affected by the added weight of a skier? Will be a couple more settled feet, methinks.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
Considerable