I've done the North Ridge twice. Getting to the basin at the top of tumbledown creek is going to be lots of postholing right now. If you camp and gain the ridge early, avy danger should be low, and the ridge is probably passable in terms of snow. I'm sure you'll find some drifts. There may be some tricky spots, but you aren't committed until you cross the notch. Unless it's wet, the moves out of the notch shouldn't be too bad, and lots of snow might help. If you hit this in the late afternoon, though, you might encounter significant avy danger and it will be unavoidable unless you go back. The top of the couloir isn't that bad, but if I were climbing the whole thing and it was firm, and axe would be very handy. It may be necessary to get across the top this early. Descent should be fine, but likely lots more postholing.