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Old 20th Nov 2005, 14:02   #11 (permalink)
OLNEY2d
 
Join Date: Oct 2005
Location: Despite the handle - am now about 10d east of 'BCN'
Posts: 56
I always assumed the shape of a given contrail was goverened by the wake-vortex pattern of the specific a/c type and its interaction with local atmospheric conditions.

Interestingly, yesterday was an exceptional day for contrails; some were visible from here stretching completely unbroken from a/c entering over Clacton routeing to HEMEL and routeing north and visible to overhead Pole Hill ! - Not sure of the track miles involved - but it must have been very cold and still up there.
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