In the clip above, SVT's meteorologist Tora Tomasdottir explains why night-shining clouds can only be seen at dusk, what an extremely high altitude the clouds are at and why it is not so strange that they give a slightly extraterrestrial impression.
Therefore, you can see shining clouds in the sky during the summer
2021-05-31T20:43:33.682Z
Between mid-May and mid-August, luminous clouds can be seen in our latitudes. The celestial phenomenon is called night-shining clouds.
Source: svt