In the late evening of 21 June a strangely shaped bright cloud was widely observed over western Iran looking west (first two pictures, from this article) while the next morning the same or another bright cloud was seen from Israel looking east (third picture, from this webcam). Both clouds - especially the 'Israeli' one - look very much like the plume left by a substantial rocket launch, and there are no natural phenomena (like exotic stratospheric clouds, noctilucent clouds or residue from fireballs) that seem to fit the observations. Alas, no rocket launch in that time frame, let alone this part of the world, has been reported so far, and the recently active Iranian launch site is in the the wrong direction for the Iranian images. Ideas how to further investigate this mystery welcome!
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