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why not look at my links above and read what they probably are?1st video
It behaves very much like light refraction from a drop of rain on a lens filter or plastic sheet in the foreground. The camera is focused at infinity (the clouds). Or possibly a reflection from the top, sunlit shape-shifting cloud laterally onto nearby clouds.
2nd video
This one looks a lot more like a sheet of plastic being bent in the foreground while the camera is focused on the clouds.
3rd video
This one looks more like small lightning discharges.
All three could be natural, though I've not seen exactly these types of light play. I did download all three and played them back at various speeds, slow and fast, to see details and how fast the shapes of the clouds changed.
None showed obvious fast enough cloud uplift or shape changes to account for the speed of the light play seen, unless one takes into account electrostatic discharges, or momentary reflections from the surface or unseen moving clouds, assuming no CGI monkey-business with the videos.
Where's atmospheric physicist James McDonald when you need him?
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The links posted by pixelsmith do go a long way towards explaining the videos. I suspected electrostatic discharges but discounted ice crystals as the clouds didn't seem high enough.
Also, I didn't hear any thunder over the wind sounds either.
But one can't judge distance from the videos, unless it included associated thunder, whereupon we could calculate distance from the speed of sound.
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