My partner and I where climbing up the Argenta slide path on an uptrack near the west side of the run.  We were almost a top when we saw an avalanche coming down a steep, rocky, NW facing chute.  We heard some celebratory sounding voices coming from the rigdeline.  No one came down the slide path, nor did they answer our calls asking if they needed help.  I assume if was human triggered, intentional or not I don't know, but no one appeared to be caught in it or hurt.  It seemed to clean out the chute, the cloud briefly obscured the whole upper basin.
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Some big wind features at the top of the slidepath, lower down it was wind protected.