2:18 p.m. on October 4, 2003 (EDT)
I have had a lot of experience with winter camping and long winter backpacks, both on skis and snowshoes, plus teaching courses to people on winter camping. Jim S and I generally do our annual backcountry snow trip together on skis. But when I take beginning snowcampers out for their first snow camping experience, we only allow snowshoes.
Some immediate clues are in your request.
1. beginning downhiller, no cross-country experience
2. wearing an Arcteryx Bora 80 with enough gear for a week
Based on observation of a couple hundred beginning winter backpackers, the answer is obvious - start on snowshoes. As a beginning downhill skier, trying to transition to XC skis in off-trail conditions is hard enough. Add the task of carrying a pack with a weeks worth of gear and food makes the skiing that much harder. Before you head into the backcountry on skis with a pack, do the following:
First, take your pack to your neighborhood lift-served resort and try skiing intermediate runs. Ah, yes, you said you are a beginning downhill skier, so you probably have avoided blue runs. Well, when you get into the backcountry, you have little choice of the slopes, and you may well be trying to ski a narrow trail through the trees. So you better try the blue runs. You may have a bit of problem with the lift operators about carrying a pack on the lift, but a 20 or 25 pound pack whould be allowed (there is a technique to getting on and off a lift with a pack, by the way, without getting hung up or crashing immediately). You will find that skiing with a pack is very different.
Second, get some lessons in off-trail skiing and experience on XC skis. The easiest transition for a downhiller is to use AT skis. With these, you unlock the heel on the level or uphills, then lock the heel for the downhill runs. With the right binding (Silvrettas, or a couple of the Diamirs), your Asolos will work just fine. If you go with a tele setup (much more fun in the long run), you will need a lot of lessons to transition and get comfortable.
Third, *after* you try the downhill with a pack *and* get skill on the off-trail skiing, then try short day trips with the combination. Don't just launch off into a week-long trip on your first backcountry skis and full pack.
An easy way to start in Yosemite is to go out the Glacier Point Road from Badger Pass on the prepared tracks. Bridalveil campground (a summer drive-in campground) is 3.2 miles out and the road is fairly level. Still, your first few times on skis with a pack will find you falling a lot (in my observation, seems to happen a lot to downhillers who are transitioning). Getting up from such a fall is really hard, especially if the snow is soft. But Glacier Point Road is kept prepared as a track, which helps a lot. Alternatively, you can book for the lodge at Glacier Point, which means you carry only a day pack to get there and back - food and lodging provided, and a guide too, if you think you need one to follow the prepared track.
With snowshoes, on the other hand, it's just like walking. You will be pretty expert after a couple hundred yards. That is, if you use modern snowshoes. I do not really favor the MSRs for a number of reasons (I've seen a lot of problems with them on the trail, and they are pretty noisy, compared to hypalon-decked ones), but they are much better than some of the more popular aluminum framed ones, and certainly than the traditional wooden ones. I have found Atlas to be excellent over the years and many hundreds of miles of use (one of my pairs has been up Denali 4 times, although I upgraded the bindings for the 3rd and 4th trips). I worry a bit, since Atlas is now owned by another big name manufacturer, though. Tubbs and Sherpa seem to be good, although their bindings seem to give more trouble on the trail. Redfeathers seem to have a lot of trouble, relatively, on the trail. Now, "a lot of trouble" is pretty trouble-free, compared to the old traditional snowshoes, but I consider having to make more than one adjustment to the bindings per 5 miles to be a lot.
Modern snowshoes are narrower and have better flotation than the traditional ones. If you size them for your weight (with pack) you don't sink far in even soft snow. Too many people buy the tiny dayhike-on-a-prepared trail size and then try to backpack on them - doesn't work well. On the level and uphill, snowshoes are as fast as skis. On rolling terrain and downhill, skis are faster, sometimes much faster. But downhill on BC skis with a heavy pack results in lots of falls. In soft snow, it is incredibly hard to get up when you have to deal with a pack. In the trees, things become even more dicey on skis. People rarely fall with snowshoes.
So, the short version is - if you are experienced in off-piste on backcountry skis, with a pack, skis have a tremendous speed advantage. You must be able to stay upright, however, in variable snow conditions, without a groomed track. If you are inexperienced on skis off prepared slopes carrying a heavy pack, snowshoes are faster and more comfortable to deal with.
My advice, based on what you presented, is this winter follow the following program -
1. develop your backcountry winter camping skills by packing in with snowshoes (your Asolos are just fine for any modern snowshoes.
2. at the same time, start taking lessons in "crud" and powder skiing, using AT skis. Then next winter, or perhaps this coming spring, try a short BC trip on skis with an experienced mentor (or take a course).
3. alternatively, in parallel with the snowshoe trips, start taking tele lessons and learn to really ski properly. Then next year, try some short BC overnighters on skis.
-- The Old GreyBearded One