Wednesday, 4. July 2007
Topic: STRANGE - on July 4, 2007 at 3:02:00 PM CEST
Butterfly Hole Punch Cloud
Hole-punch clouds or fall-streak holes, such as the ones shown above near Shreveport, Louisiana, are caused by falling ice crystals. The ice crystals could originate in a higher cloud or be facilitated by a passing airplane exhaust. If the air has just the right temperature and moisture content, the crystals will absorb vapor as they fall and thus continue to grow.
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