It took me a while to dig one up, but back when I did a little above-treeline camping (very little, actually, with my Bibler eldorado), I used these deadman stakes which were made from the venerable yellow plastic stakes with the heads and points cut off and were then drilled to make them lighter. I remember some skeptics early on, but once upon a time I buried one in about 6 inches of snow, which was attached to a long piece of 550 parachute cord, let the snow consolidate for a while and had 3 fit men (all at once) pull with all their might (in the normal line of stress) to see if they could pull it up or break it. They couldn't. I understand that if you have pickets, flukes, ice axes, skis, snow stakes, etc, that those will work just fine, especially when you're pitching under duress in a screaming gale, but if you've got the luxury of time and reasonably calm conditions to pitch your shelter, these things are quite adequate. I called them "Deadfeathers".
Mt. Baker, Cascades