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- Q212378 subject Q6655584.
- Q212378 subject Q7145395.
- Q212378 subject Q8266666.
- Q212378 abstract "A fallstreak hole, also known as a hole punch cloud, punch hole cloud, skypunch, canal cloud or cloud hole, is a large circular or elliptical gap that can appear in cirrocumulus or altocumulus clouds. Such holes are formed when the water temperature in the clouds is below freezing but the water has not frozen yet due to the lack of ice nucleation (see supercooled water). When ice crystals do form it will set off a domino effect, due to the Bergeron process, causing the water droplets around the crystals to evaporate: this leaves a large, often circular, hole in the cloud.It is believed that the introduction of large numbers of tiny ice crystals into the cloud layer sets off this domino effect of evaporation which creates the hole. The ice crystals can be formed by passing aircraft which often have a large reduction in pressure behind the wing- or propeller-tips. This cools the air very quickly, and can produce a ribbon of ice crystals trailing in the aircraft's wake. These ice crystals find themselves surrounded by droplets, grow quickly by the Bergeron process, causing the droplets to evaporate and creating a hole with brush-like streaks of ice crystals below it. The articles by Westbrook and Davies (2010) and Heymsfield et al. (2010) explain the process in more detail, and show some observations of their microphysics and dynamics. Such clouds are not unique to any one geographic area and have been photographed from many places.Because of their rarity and unusual appearance, as well as very little exposure in media, fallstreak holes have been mistaken for or attributed to unidentified flying objects.".
- Q212378 thumbnail Fallstreak_hole,_photo_taken_at_Cold_Springs_Bridge.JPG?width=300.
- Q212378 wikiPageExternalLink 5863482.
- Q212378 wikiPageExternalLink uk-england-derbyshire-19333059.
- Q212378 wikiPageExternalLink 14841-hole-punch-clouds-gallery-formations-cut-airplanes.html.
- Q212378 wikiPageExternalLink hole-punch-cloud-not-ufo-spotted-over-moscow.
- Q212378 wikiPageExternalLink hole-punch-clouds-20130123.
- Q212378 wikiPageWikiLink Q1325808.
- Q212378 wikiPageWikiLink Q202411.
- Q212378 wikiPageWikiLink Q207546.
- Q212378 wikiPageWikiLink Q213659.
- Q212378 wikiPageWikiLink Q215631.
- Q212378 wikiPageWikiLink Q285332.
- Q212378 wikiPageWikiLink Q3136993.
- Q212378 wikiPageWikiLink Q3281195.
- Q212378 wikiPageWikiLink Q40748.
- Q212378 wikiPageWikiLink Q421.
- Q212378 wikiPageWikiLink Q6655584.
- Q212378 wikiPageWikiLink Q682875.
- Q212378 wikiPageWikiLink Q7145395.
- Q212378 wikiPageWikiLink Q8074.
- Q212378 wikiPageWikiLink Q8266666.
- Q212378 comment "A fallstreak hole, also known as a hole punch cloud, punch hole cloud, skypunch, canal cloud or cloud hole, is a large circular or elliptical gap that can appear in cirrocumulus or altocumulus clouds. Such holes are formed when the water temperature in the clouds is below freezing but the water has not frozen yet due to the lack of ice nucleation (see supercooled water).".
- Q212378 label "Fallstreak hole".
- Q212378 depiction Fallstreak_hole,_photo_taken_at_Cold_Springs_Bridge.JPG.