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Old 20-09-2015, 08:52 PM   #762
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Location: UK
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Temperature and humidity must be considered. This varies from hour to hour, day to day and sometimes quite abruptly (and randomly) at different altitudes.

This all permits contrails to persist and spread greatly under the right conditions.

If you doubt this, ask some amateur meteorology news groups for their views and please report back here.

Amateur pilots' groups will also have something to share.


Last edited by thermion; 20-09-2015 at 08:54 PM.
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