Most seasons in the Wasatch feature some sort of PWL problem but it very rarely lasts more than a couple of weeks. Shitty early season snow tends to get buried fast and bridged and the occasional January high pressure dry spell that produces thick hoars is usually followed by consistent snowfall that inactivates the weak layer within a couple of storm cycles.
I think this is the worst it's been since I started touring in 08 or so. Hard to say how much of the issue is directly related to the snowpack vs an increase in the touring population + changes in behavior. Regardless, the results speak for themselves. This is an uncommon problem and we're not adjusting to it fast enough.
Edit: clearly, persistent weak layer isn't the right term for the standard issue we deal with in the Wasatch. Short-term problem with deep slab instability is more like it.
A truly persistent weak layer is a rare beast for us and we are now seeing the consequences.
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