http://crisisofdemocracticstates.blogspot.fi/p/a-couple-of-photos-of-jewelry-clouds.html Kimmo Huosionmaa Jewelry clouds are the fascinating phenomenon, where some clouds are forming as thinner than rest of the clouds. This means that they would seem like some flying saucers. Jewelry clouds are sometimes caused UFO-alerts around the world. But sometimes clouds are very rare, and when we are talking about donuts-shaped clouds, where is vertical holes in their form, we might think that they are forming by screw-shaped air flow, what makes the hole in the cloud. Sometimes those holes are caused by standing air whirl, what can be very dangerous for airplanes. You can see those photos from here: https://sites.google.com/view/jewelrycloudsespoo2352018/etusivu When we are thinking about holes in the clouds, we must remember, that in some cases, what happens near so-called "Bermuda triangle" were claimed that there would be something like donuts-shaped form in the clouds, ...