A group from the Web community SkiTour also triggered a fairly large avalanche on the Coupa on Saturday (23/12). The slopes are reputed to be very avalanche prone.
http://www.skitour.fr/sorties/la-coupa,4468.html#sortie
The slide was 70m wide and about 70-80cm deep, large enough to bury someone. After triggering the slide the group, who had just attended an avalanche course, noted that the slope was around 35 degrees, in the lee of strong winds and they hadn’t left enough space.
A group in the Combe Charbonnière at l’alpe d’Huez also noted avalanche activity on Christmas eve.
http://www.skitour.fr/photos/avalanche-de-plaque,4465-2.html