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  1. As I know, aircraft contrails normally form above about 25000 feet or snow, but watching the aircraft over my house last Friday (12th February) I was surprised to see persistent contrails forming at an altitude as low as 12000 feet - a Flybe Dash 8 flying from Manchester to the IOM was contrailling persistently at 15000 feet (FL150). I have read that for contrails to form the air temperature has to be around -25C or so but 10000feet or so corresponds to the 850HpA level and even though we had cold upper air around last Friday it would not the temps at 10000 feet-15000 feet be no less than about -8C or so? So can anyone explain why I saw contrails at pretty low altitude last Friday? I know humidity is also involved so maybe something to do with the humidity of the air - I might expect a contrail forming at 10K feet when we are under an airmass with -25C 850s or below but why so low trail level on Friday 11th? Luke
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