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Message: <blockquote data-quote="Thilina Sandaruwan" data-source="post: 8970113" data-attributes="member: 131814">There  seems to be no end to strange cloud formations! From Punch hole clouds  to cloud vortices, enjoy these rarely seen cloud formations! <img src="http://www.funonthenet.in/images/stories/forwards/cloud-formations.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://lh4.ggpht.com/_hVOW2U7K4-M/SUgUwNgXoxI/AAAAAAAAvOY/h7i4L71htJo/s640/45674r6uhrfgfcv.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Punch Hole Clouds  may appear as a circular or oval holes in a layer of supercooled  clouds; sometimes they assume a form of a perfect circle and persist for  quite a long time, drifting together with the cloud layer. One  explanation seems to blame the air traffic (the jet contrail  intersections) combined with a thermal inversion (a circular motion of a  rising warm air). Here is one, observed over the Gunnison Valley in  Colorado: <img src="http://lh6.ggpht.com/_hVOW2U7K4-M/SUgUvU6Iu_I/AAAAAAAAvOA/RjORYZ2-lpQ/s640/er6thjedgfcv.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Another strange hole in the cloud, reported from Mobile, Alabama USA, Dec. 2003 (and covered by BBC News):<img src="http://lh6.ggpht.com/_hVOW2U7K4-M/SUgUx2wiy_I/AAAAAAAAvPI/xTXdj-ewJEs/s640/34w5ywerhgdfbfgc.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Photo taken in Melbourne, Australia in 2003:<img src="http://lh5.ggpht.com/_hVOW2U7K4-M/SUgUvnjKEOI/AAAAAAAAvOM/0rep8mGBcQg/s640/354rthetrdgf.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />It  seems both rising and sinking air currents can create the same effect.  Sometimes a very stable, uniform layer of high-altitude clouds can get  "punched though" by a pocket of cold air, which sinks toward the ground -  creating the circular hole formation. <img src="http://lh5.ggpht.com/_hVOW2U7K4-M/SUgUxUm_W0I/AAAAAAAAvO8/lbRcBP8gftc/s640/e56uestgnfgc.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />These  "cloud holes" can look like the footprints of some celestial being (UFO  enthusiasts rejoice!) or can be amazingly round, like this pair  observed in Gallatin, Tennessee by Wayne Carter: <img src="http://lh5.ggpht.com/_hVOW2U7K4-M/SUgUzJXIJuI/AAAAAAAAvPg/kNs9xTXJJjg/s640/wrthedfbdcgvb%20c.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> NASA takes satellite images of this phenomenonNASA  Terra satellite equipped with the Moderate Resolution Imaging  Spectroradiometer (MODIS) has captured these images over Acadiana area  in southern Louisiana - a splattering of round holes actually stretched  over several states: Oklahoma, Arkansas, Louisiana, and Texas. Some were  elongated, some appeared to have smaller clouds inside them. <img src="http://lh3.ggpht.com/_hVOW2U7K4-M/SUgUzBAeruI/AAAAAAAAvPU/OThFYTHsbg0/s640/435yerhdfndffd.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Theodore  von Karman's "Cloud Vortices" are something else, again: they form when  the wind encounters a barrier - such as the Aleutian islands, in this  case - and the flowing eddies of cloud create a weird pattern. The image  you see below was photographed from the International Space Station,  and the animation shows the double row of vortices, which rotate  opposite from each other. <img src="http://lh3.ggpht.com/_hVOW2U7K4-M/SUgppvCclMI/AAAAAAAAvQs/-zLKiyTsL88/s640/35yherbgfsd.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />NASA imageMore Incredible and Fascinating Clouds...that  make our sky worthy to look at from time to time (those who only look  at the computer monitor, take note). Here is an extremely strong  thunderstorm cloud that brewed over northwest Calgary:<img src="http://lh3.ggpht.com/_hVOW2U7K4-M/SUgppA4SR3I/AAAAAAAAvQU/foDxnsEQUV8/s640/w45ywerhgdfbdc.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://lh6.ggpht.com/_hVOW2U7K4-M/SUgpqizzixI/AAAAAAAAvQ4/yV5VnKFIrD0/s640/345yerhgdbffg.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Another supercell cloud in Alberta skies, this time over Edmonton: <img src="http://lh3.ggpht.com/_hVOW2U7K4-M/SUgppS-hxbI/AAAAAAAAvQg/c1wqLx83HtE/s640/356euewhthdfvc.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </blockquote>

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