Observed various D0.5/D1 west loose avalanches (old and occurring over the course of the day) along the winter chute up Ellinor yesterday.
Signs of Unstable Snow
* Cold in the morning: car got stuck high-centering over 4" deep snow; top 1.5" was a hard icy slab, whereas everything underneath was storm snow/powder (location was 47.5133, -123.2283).
* Lots of rollerballs (tennis ball sized) falling late morning/early afternoon.
* Snow was falling off the trees below treeline, resulting in slush.
* Quick hand-shear test identified surface level instability (diffused break) with a slab around 1.5" in depth.
* Cornices were on ridges mostly on northern/western aspects, but there was one on an eastern aspect (we could see) under the false summit (47.5216, -123.2577).
* Snow up chute was hard to penetrate with crampons; couldn't get much purchase late morning to early afternoon.
More details are found here: https://www.wta.org/go-hiking/trip-reports/trip_report-2021-03-16-3933685420 .
Observed Avalanche Problem #1:
The north side of the ridge along the winter chute up Ellinor and above it to the summit was corniced with small overhangs (<3"). There was also a small cornice overhang on the east side on the final ridge near the summit.
Observed Avalanche Problem #2:
A lot of wet loose debris fell down the winter chute over the course of the day.