25. 01. 2017
The inhabitants of California were able to observe an unusual phenomenon. Last weekend, there were holed clouds in the sky. This particular shape of a cloud was achieved by aircrafts, namely their propellers.
Clouds are round or slightly oblong.
For the appearance of such special clouds, certain conditions must be met. First, the clouds have to be thin. Second, the aircraft should fly at a certain altitude (below 6000 meters). Otherwise, it fails to achieve such an effect.
Flying through the clouds, the aircraft produces a large pressure drop. There is a steam condensation. Precipitation falls as snow. And so there are holes in them clouds.
Previously, such a phenomenon has been observed in Western Europe, Australia, and China. As for the emergence of such phenomena, an interaction of many factors should be present. It is impossible to predict when and where the holed clouds will appear again.