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If water droplets in the cloud are supercooled (below freezing but still liquid), they can suddenly turn to snow when shocked by the passage of the plane.
Originally posted by StarTraveller
reply to post by Seagle
Couple of links regarding Cloud Seeding, not 100% convinced myself I have to add. I would be more inclined to look toward the earth magnetism but I am not expert on the subject so will not claim to know much about Could Seeding.