There's many names for the same line in EV. What you call Timber Falls, I call King Arthur. When that slides, it often slides a lot farther. It is a much more open path that Racquet. Was it moving 80MPH, no, but you wouldn't call it slow or feckless had it caught you; your rationalization is very much "it is gonna go but I'm a good enough skier not to get caught."
If you are looking for snow science feedback, you figured on the avalanche running short AND not stepping down. It is hard enough with the unpredictability of when a skier may trigger deep instability, but it is dubious to say that you looked around, dug one pit, did a CT, and decided that a "high likelihood" shallow avalanche would not set off something deeper. How in Colorado winter can you be confident in that? Did you have a good sample?
CT has poor sensitivity to deep instability. Also, the load of an avalanche is a larger trigger than a skier by several orders of magnitude.
It didn't step down... this time. Was that judgement, or luck? Suffice to say that you think it was judgement. Being unlucky is a poor outcome despite judged/managed risks; being lucky is a good outcome despite misjudged/unmanaged risk.
I wasn't there. But, I doubt I'd trust a depth hoar snowpack in that way. Is that about my risk acceptance? Or is it about your overconfidence in your ability to prognosticate with your 2 seasons and a maritime Level 1? Maybe there is some of the former, but absolutely there is the latter. You haven't seen a snowpack like this season's before.
So here is my advice: Don't put so much stock in your pit. We don't dig pits for permission to set off avalanche A and not experience avalanche B. Pits do not say "go!" They can say no. We dig pits to make sure we aren't missing something.
I think you'll enjoy this thread about risk... it will appeal to you as an engineer: http://www.tetongravity.com/forums/s...28with-pics%29
Maybe you have an extensive history of serious injuries and recovery. You seem extremely nonchalant and confident that you can deal with such injuries. Maybe you don't have any history. Nobody skis far on a broken leg or worse. So I have to ask, what do mean by being prepared to "deal with the sorts of injuries I mentioned"? Does your first aid kit have what you need to let you "deal with" with a pneumothorax, a femur, a broken pelvis? Do you think you can patch up and ski with a tib fib? Do your buddies know how to use your first aid gear? Do you have enough equipment to bivy?
Say you get an open tib-fib one afternoon in Timber Falls. If you haven't had something like that happen, I REALLY want to know what do you think your next 3 hours would look like? Next 12? Day? Week? Month? Year?
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