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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 particles (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 propellor-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 are often mistaken for or attributed to unidentified flying objects.".
- Fallstreak_hole thumbnail Omarama_Fallstreak.jpg?width=300.
- 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 wikiPageRevisionID "603903944".
- Fallstreak_hole hasPhotoCollection Fallstreak_hole.
- Fallstreak_hole subject Category:Clouds.
- Fallstreak_hole type Cloud111439690.
- Fallstreak_hole type Clouds.
- Fallstreak_hole type NaturalPhenomenon111408559.
- Fallstreak_hole type Phenomenon100034213.
- Fallstreak_hole type PhysicalEntity100001930.
- Fallstreak_hole type PhysicalPhenomenon111419404.
- Fallstreak_hole type Process100029677.
- 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 particles (see supercooled water).".
- Fallstreak_hole label "Fallstreak hole".
- Fallstreak_hole label "Fallstreak hole".
- Fallstreak_hole label "Hole Punch Cloud".
- Fallstreak_hole label "Skypunch".
- Fallstreak_hole label "穴あき雲".
- Fallstreak_hole sameAs Hole_Punch_Cloud.
- Fallstreak_hole sameAs Skypunch.
- 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 Q212378.
- Fallstreak_hole sameAs Q212378.
- Fallstreak_hole sameAs Fallstreak_hole.
- Fallstreak_hole wasDerivedFrom Fallstreak_hole?oldid=603903944.
- Fallstreak_hole depiction Omarama_Fallstreak.jpg.
- Fallstreak_hole isPrimaryTopicOf Fallstreak_hole.