Visibility II / V
I was a little startled when I went to the yard and noticed a green ray of light coming from behind the forest. It wasn't very bright, but in a direction where I know there are ten or so kilometers of uninhabited forest without any mentionable roads. My first thought was that it was the aurora borealis, but since it stayed as it was, and there were no aurora borealis visible anywhere else, I concluded that it was an artificial light pillar. (Later at night, though, we could see the northern lights as well.) I took a few pictures of the green pillar, and noted that there was also another, red pillar next to it. It was so dim that it only stood out in photos.
The pillars were at a distance, because the individual low clouds that wandered in the sky passed in front of the pillars, covering them when they happened to meet the pillars. The center of Kurika is exactly in the direction where the pillars were, but it is almost 30 km away. The temperature was -6°C and there was no sign of ice fog. Instead, the Finnish Meteorological Institute's rain radar image was able to tell that at the exact time the pillars appeared, a small-scale snowstorm had passed over the center of Kurika. I would assume that the pillars were born from some of the lights in the center of Kurika and that snowfall. If so, they could be seen quite far away.
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