In the sky above Helsinki formed alien funnel

This morning in the sky over Helsinki crater resembling the silhouette of an alien flying saucer.

Representatives of the administration of the capital have published a photo taken from the Senate square, on his official Twitter page with the comment, which describes the assumptions incurred on the palate outlines. Some thought it the work of aliens, while others believe that the good weather was the reason for the emergence of this unusual pattern.

Review from our group:

Hole in the clouds caused by falling ice crystals. This rare effect can be seen in cirro-Cumulus clouds — large circular gap that is called a Fallstreak.

Ice crystals can form in the higher clouds or in the exhaust gases of the aircraft flown. If the air has a suitable temperature and moisture content, the falling crystals will absorb water from the air and grow. For this to happen, the water must be so cold that freezing it needs only a suitable surface. Loss of moisture in the air increases the evaporation rate of water droplets in the cloud, and they are scattered, forming a hole.

Translated by «Yandex.Translator»