Avalanche

Lookers left of little AK

Avalanche.org observerCentral Sierra Nevada
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Observation photo 1

Quick report

Collapsing
isolated

We went out in the upper Ward Canyon area for a easy tour after this weeks storm. Our objective was to get outside, get some exercise, and stay safe. We aimed for mellow terrain and/or slopes that would not have the Feb 10 weak layer. Telemetry data indicates 51" of new snow at 7000ft in this area since last Sunday, the snow on leeward slopes felt bottomless, I did not measure HS. We could only feel the old snow on wind scoured ESE aspects above about 8000 feet. In this area there was likely not much old snow, as there were still bushes and rocks protruding during our tour today. A NE facing test slope at 7950' was not reactive. After undercutting and and jumping with as much force as I could, a small 12-to 16" soft wind slab broke off (but did not slide). I did feel some very slight collapsing (~1/4") and my partner heard whoomphing, but we did not see any cracks. Clear skies led to the CDO (California Death Orb) making its appearance. By 1030am southerly slopes had cooked. Zipper crusts had formed where trees provided respite from the sun. Breaking trail was an effort. Northerly slopes preserved cold snow during our exit around 1pm. Looking along the Sierra Crest to the south the large cornices generally remain where they formed. We did see the large and recent avalanche pictured. Another older avalanche may have occurred just out of sight in the steeper zone to the north. We did not get around the bend, or above it to see how far it ran. Storm snow stability appeared fair to good, but I prefer to leave sleeping dragons to rest.

Avalanche

Size
D2.5
Aspect
NE
Trigger
N
Elevation
8200 ft

R1-D2.5 looked to have run the day before as the debris was buried with some new snow but not completely gone. Unknown if this slid on the PWL or within the storm snow, and may have been triggered by a cornice fall from the rocks above.