Ken Cook wrote:

Clouds are not my strong point but my theory is that the hole was
formed by a jet passing through, exhaust evaporating the Sc sheet and
the saturated air mixing with the air below forming the trail.
Am I even close? Any ideas?
Ken
Copley, nr Barnard Castle, Teesdale

http://copley.website.orange.co.uk

May be a distrail but more likely that something other than an aircraft
has caused that part of the cloud to glaciate and once the process has
started the ice will propogate through the cloud sheet?? So not
evaporation but glaciation / virga (what used to be called fallout).

Looks a bit high for stratocumulus (pic1)

Les