"Kern Canyon – that's a good backup. When you used that as a bailout, what did you do from there? Wait till things cleared then hiked out to Whitney Portal?"
Simon,
As I mentioned in my original post, I haven't had to use it yet. I have been in Kern Canyon many times, down as far as Rattlesnake Creek, and spend a lot of time in the Upper Kern/Great Western Divide region. As part of my trip planning, I long ago figured out that the canyon would be far and away the safest place to ride out a bad storm in that area. Depending on conditions after a storm subsided, I would either hike out down the canyon or climb back out and exit over Shepherd Pass. Going out over Whitney would be more difficult than Shepherd Pass if significant snow had fallen. If I am out there in October, I am constantly keeping my routes down into the canyon in mind, especially if the weather starts to look iffy. That said, if you are anywhere between Forester Pass and Wright Creek, you should be able to high tail it out over Shepherd Pass if things start to look seriously bad, before the pass gets blocked. There are very distinct trails to follow, and they would not likely be obscured in the amount of time, say 3 hours max, that it would take you to get over the pass. Much beyond Wright Creek you would have to make a judgment call as to whether to go for Shepherd Pass or drop down Wallace Creek(High Sierra Trail) into the canyon. It's always good, IMO, to keep scenarios like this in mind if you are hiking in this area in mid-late October. You'll probably not have to use them, but it's nice to have thought them through in advance, just in case.