Well done, and now you probably are a bit closer to having those skills to avoid it next time.
I know several times I've been above tree line on peaks with 100 or 150 feet of visibility but it always stays that way. You've seen it change to near zero.
Did you have a shovel for the snow cave or did you use a snowshoe?
Thanks, Mike. That's about what the visibility was as I arrived at the summit (even took a photo).
The snow was configured with a few inches of light powder over a robust layer of ice/crust over a few feet of powder. I found that sweeping the snow under the crust out with my mittens, I could snap off the scrub branches as I encountered them. The powder made tunneling impossible, so I ended out with a large shelf over me and I used a couple of courses of crust pieces from nearby (picture flagstones) stuck in the outside snow to make a windwall. I put on the Adventure Medical Thermo-Lite bivy sack (yes, plug, it saved me) and slithered under the shelf with my torso on my pack and my legs on the branches I had harvested. It wasn't pretty but I was well-protected.
The article was favorable but in fact I made mistakes that got me into the situation. One major one was that I carried a new (to me) Garmin eBay eTrex I had bought as a back-up, instead of my 76CXs. When I got off route, I took it out (properly oriented in pack lid) and learned it had lost the signal down on the Glencliff Trail and, inexplicably, had not recovered it (I had used it skiing in the Ossipees the day before and it worked OK, but with weaker reception than the 76CSx). To compound things, I had not yet loaded Topos, so it had the useless base map that Garmin provides as part of their profit enhancement program. So, when it recovered the signal at the bivy site, all I knew was that I was north of Warren, NH. Had it had a signal earlier and been recording my track, though, I could have zoomed in and followed the crumb track back, map be damned. See post below on compass. I'd have been home tipping back a cold one at 5pm if I had taken the better GPS. I shared this with Todd Bogardus, the F&G district chief, and we agreed this was unfortunate (but not negligent

).