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Old July 5th 09, 06:11 AM posted to uk.sci.weather
Darren Prescott[_2_] Darren Prescott[_2_] is offline
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First recorded activity by Weather-Banter: Sep 2007
Posts: 819
Default extremely high silvery white 'Cirrus'

Now visible at 1955Z between WSW and NW, these are
considerably higher than the other 'normal' Ci fibratus clouds
I can see nearby at about 30000ft.

Volcanic, apparently:

http://www.spaceweather.com/