Avalanche: Alexander Basin

Observer Name
T Diegel
Observation Date
Sunday, February 14, 2021
Avalanche Date
Sunday, February 14, 2021
Region
Salt Lake » Mill Creek Canyon » Alexander Basin
Location Name or Route
Upper Alexander Basin
Elevation
9,600'
Aspect
North
Slope Angle
Unknown
Trigger
Natural
Avalanche Type
Hard Slab
Weak Layer
Ground Interface
Depth
Unknown
Width
100'
Vertical
500'
Comments
We were up in the Yellow Jacket trees/Bowman area the last two days. This morning we saw what we are certain was a natural avalanche across the basin; a steep, north facing slide that likely ran overnight. It's in a zone that I don't think is often skied since it's awkward to access, but I have skied it, many moons ago.
Comments
Every day gets more complicated. Yesterday was pretty wet snow that filled in old tracks and old debris (from the Yellow Jacket slide a week ago) pretty well, and overnight it seemed that there was about 6 more inches on top of that. At least this most recent storm combo was right side up and when digging a little the overnight snow bonded pretty well to the old snow, and from how much the aspens had snow on them it didn't seem like there was as much wind affect. That said, we did see a small new-snow crown near the top of Depth Hoar Bowl as well (too small/too far away to show in a picture), but it didn't propagate far nor step down. However, not surprisingly we didn't tickle any dragons at all and continued to bash brush on low angle slopes the way it seems we have all season.
It's hard to say how Monday's new snow will/will not bond to last night's snow; probably pretty well, actually since it should be approximately the same temperature, and it sounds like the winds will behave themselves. But the overall weight of this prolonged snow event is impressive, which effectively is putting down an entire blanket of wind-deposit type of accumulations on the 'pack, so everything could come unglued? Seems like it is getting there already, and it's starting to get difficult to keep track of what's slid (and thus getting reloaded fairly bigly on a hard bed surface) and what hasn't, but it kinda doesn't matter anyway, since the likelihood of a repeater may be comparable to those that still hang in the balance?