I guided an ascent of Mt Athabasca up and down the AA Col on August
23.
The recent snowfall accumulation of approximately 30 cm has made the
rubble on the AA Col route less tedious, but has also formed
windslabs on lee features. Six people who climbed the Silverhorn on
Aug 23 triggered a slab and were carried down 30 metres. They were
fortunate they didn't go further than that. On the same day, a party
of four turned back from the Ramp route on Mt Athabasca when they
encountered windslab. Furthermore, a size 2 slab has cut out of the
steep ice face below the AA Col next to Mt Andromeda.
Steep ice routes on lee features should be avoided for a while.
Grant Meekins
ACMG Mountain Guide
Yamnuska Mountain Adventures
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