1. Fallstreak holeA fallstreak hole, also known as a hole punch cloud, punch hole cloud, skypunch, canal cloud or cloud hole, is a large circular 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.
Read “Fallstreak hole” on English Wikipedia
Read “穴あき雲” on Japanese Wikipedia
Read “Fallstreak hole” on DBpedia
Read “Fallstreak hole” on English Wikipedia
Read “穴あき雲” on Japanese Wikipedia
Read “Fallstreak hole” on DBpedia
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