I'm on a trip visiting my friend in Central Finland and yesterday we had a 96% warning for aurora chance. Unfortunately, for us, the sky was quite cloudy and we didn't get a chance to see the lights. When we were heading back home I saw a faint line of blueish-purple in the sky, which seemed unusual, and told my friends "hey what if this is the aurora". I checked the photos from the other people that claimed they saw the lights and it checked out with what I've seen.