streamer clouds

Last September I flew from Santa Rosa to Renton and photographed an
interesting cloud which reminded me of what a jet contrail might look
like if somebody flew an arc over a river. Pictures posted he

http://www.flying20club.org/streamer.html

Anybody seen anything like this before? Any idea what might make it?

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
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