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Contrails or vapor trails are "human-induced" line-shaped ''streamer'' clouds that form when the hot exhaust from an airplane's engines meet humid cold air high above the Earth's surface. Contrails always consist of ice particles that are made by water vapor condensing and freezing at high altitudes.

Contrails can predict the weather. A thin, short-lived contrail indicates low-humidity air at high altitudes, a sign of fair weather, while thick, long-lasting contrail reflects humid air at high altitudes and can be an early indicator of a storm. P8022672 P8132841


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