When I checked the weather forecast in the evening, everything changed. It was still high pressure, but lots of fog with only a very little probability of clear skies was predicted. Moreover the strong southerly wind was supposed to bring dust from northern africa into central europe. This means either fog or clouds or yellowish overcast sky. Both would kill my plans. I decided to stay one more night to give it a try.
The next day was cloudy and foggy but not yet yellowish. I checked some webcams and decided to hike during the day to a mountain hut at the foot of the west walls of Rosengarten/Catenaccio. No sun only fog and clouds during the day. I descended went to a cafe and waited. I knew a good spot for the evening light which was nearly an hour hike from the parking. I started the climb not very motivated, I was pretty sure it will be more physical exercise than photography.
However the gods had mercy. It was just 15 minutes before arrival at my spot, when the clouds started to vanish. I increased my pace to maximum speed (not good for photography, it is never good if you are panting while shooting.... even with tripod) and arrived just in time for 20 min good light before the sun disapeared behind the clouds shrouding the Brenta.