We skied on the N face of Snow Spider yesterday. We saw evidence of 3 seperate
Na size 1.5-2 on S aspects near 2000m. They appeared to be radiation triggered
with the recent Hst of 25 cm failing on the SC. Although small the propagation
was very broad and they ran far, one went close to full path.
A TP in a sheltered TL location on the N side at 2000m revealed well preserved
Jan 04 SH up to 10mm down 60cm and producing sudden planar shears in the low
end of moderate range. Another profile at 2150m in an alpine bowl showed
decomposing SH 3-5mm and producing SP shears in the upper end of moderate. We
witnessed no cracking or had ski test results. However this layer is definitely
a concern in specific locations and could light up with increased load.
Additionally there was much whumping in the valley bottom on the newest SH
layer which I observed earlier in the week under Mt Joffre as large as 20mm and
as high as 1600m. Play safe with additional snow accumulation.
Tim Pochay
MG
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