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- Fallstreak_hole 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.".
- Fallstreak_hole thumbnail Fallstreak_hole,_photo_taken_at_Cold_Springs_Bridge.JPG?width=300.
- Fallstreak_hole wikiPageExternalLink 5863482.
- Fallstreak_hole wikiPageExternalLink uk-england-derbyshire-19333059.
- Fallstreak_hole wikiPageExternalLink 14841-hole-punch-clouds-gallery-formations-cut-airplanes.html.
- Fallstreak_hole wikiPageExternalLink hole-punch-cloud-not-ufo-spotted-over-moscow.
- Fallstreak_hole wikiPageExternalLink hole-punch-clouds-20130123.
- Fallstreak_hole wikiPageID "12963827".
- Fallstreak_hole wikiPageLength "4606".
- Fallstreak_hole wikiPageOutDegree "21".
- Fallstreak_hole wikiPageRevisionID "673107444".
- Fallstreak_hole wikiPageWikiLink Altocumulus.
- Fallstreak_hole wikiPageWikiLink Altocumulus_cloud.
- Fallstreak_hole wikiPageWikiLink Bergeron_process.
- Fallstreak_hole wikiPageWikiLink Category:Articles_containing_video_clips.
- Fallstreak_hole wikiPageWikiLink Category:Clouds.
- Fallstreak_hole wikiPageWikiLink Category:Unidentified_flying_objects.
- Fallstreak_hole wikiPageWikiLink Cirrocumulus.
- Fallstreak_hole wikiPageWikiLink Cirrocumulus_cloud.
- Fallstreak_hole wikiPageWikiLink Cloud.
- Fallstreak_hole wikiPageWikiLink Clouds.
- Fallstreak_hole wikiPageWikiLink Contrail.
- Fallstreak_hole wikiPageWikiLink Domino_effect.
- Fallstreak_hole wikiPageWikiLink Fallstreak.
- Fallstreak_hole wikiPageWikiLink Ice_crystals.
- Fallstreak_hole wikiPageWikiLink Ice_nucleation.
- Fallstreak_hole wikiPageWikiLink Ice_nucleus.
- Fallstreak_hole wikiPageWikiLink List_of_cloud_types.
- Fallstreak_hole wikiPageWikiLink Supercooled_water.
- Fallstreak_hole wikiPageWikiLink Supercooling.
- Fallstreak_hole wikiPageWikiLink Unidentified_flying_object.
- Fallstreak_hole wikiPageWikiLink Virga.
- Fallstreak_hole wikiPageWikiLink File:Fallstreak_hole,_photo_taken_at_Cold_Springs_Bridge.JPG.
- Fallstreak_hole wikiPageWikiLink File:Fallstreak_hole_over_Moscow_04.ogg.
- Fallstreak_hole wikiPageWikiLink File:HolePunchCloud.jpg.
- Fallstreak_hole wikiPageWikiLink File:OKC-Fallstreak.jpg.
- Fallstreak_hole wikiPageWikiLink File:Omarama_Fallstreak.jpg.
- Fallstreak_hole wikiPageWikiLink File:Texas_tmo_2007029_lrg.jpg.
- Fallstreak_hole wikiPageWikiLinkText "Fallstreak hole".
- Fallstreak_hole wikiPageWikiLinkText "fallstreak hole".
- Fallstreak_hole hasPhotoCollection Fallstreak_hole.
- Fallstreak_hole wikiPageUsesTemplate Template:Climate-stub.
- Fallstreak_hole wikiPageUsesTemplate Template:Commonscat.
- Fallstreak_hole wikiPageUsesTemplate Template:Stack.
- Fallstreak_hole subject Category:Articles_containing_video_clips.
- Fallstreak_hole subject Category:Clouds.
- Fallstreak_hole subject Category:Unidentified_flying_objects.
- Fallstreak_hole hypernym Gap.
- Fallstreak_hole type MountainPass.
- Fallstreak_hole type Science.
- Fallstreak_hole 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).".
- Fallstreak_hole label "Fallstreak hole".
- Fallstreak_hole sameAs Hole-Punch_Cloud.
- Fallstreak_hole sameAs Skypunch.
- Fallstreak_hole sameAs پنجره_ابر.
- Fallstreak_hole sameAs Lyukas_felhő.
- Fallstreak_hole sameAs Lubang_awan.
- Fallstreak_hole sameAs 穴あき雲.
- Fallstreak_hole sameAs Fallstreak_hole.
- Fallstreak_hole sameAs Nuvem_perfurada.
- Fallstreak_hole sameAs m.02z1kk2.
- Fallstreak_hole sameAs Lỗ_mây.
- Fallstreak_hole sameAs Q212378.
- Fallstreak_hole sameAs Q212378.
- Fallstreak_hole sameAs 雨幡洞云.
- Fallstreak_hole wasDerivedFrom Fallstreak_hole?oldid=673107444.
- Fallstreak_hole depiction Fallstreak_hole,_photo_taken_at_Cold_Springs_Bridge.JPG.
- Fallstreak_hole isPrimaryTopicOf Fallstreak_hole.