First April weekend skiing in National park Gran Paradiso I.

First weekend in April I went to visit my colleague working now in Annemasse (Fr).
For skitouring there were only two days available, locals has recommended to visit
surroundings of mountain hut Rifugio Vittrorio Sella (2588 m), which is located in National park Gran Paradiso in west part of Aosta valley. According to actual conditions we wanted to summit Gran Serra (3552m) and than to do some descents in hut neighbourhood.