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21 December 2017
Rare Cloud Display Across Ohio and Indiana Thursday
You see those strange holes in the clouds across Indiana and Ohio? These are fallstreak holes or “hole punch” clouds, and they happen when aircraft fly through clouds of supercooled water. These clouds are well below 0° C, but the cloud droplets are still liquid (water will not always freeze into crystals of ice until the temperature reaches about -40° F/-40° C). If a few ice crystals are introduced, then a rapid …