In reply to hoolabloom:
Big storm coming this weekend, snow up high but thunderbolts and lightning for a few days down in the valley. Freezing point is said to be somewhere around 3000-3500m, so the walk at the end of the Vallee Blanche is about to get an awful lot longer, and the skiing, whilst potentially enjoyable-enough at first, will quickly become "sporty" the further down you go.
I had a run off the Midi yesterday and, to be honest, I'm tempted to not go up again for a while, unless conditions turn out to be decent.