Check out the following video which shows the clouds rapidly changing shapes! The first thing that came into my mind was aliens shooting something that causes the clouds to move. It’s surreal.
The answer lies in this: ice crystals, especially long needles, tend to become aligned with the ambient electric field. So what you are seeing is sunlight reflecting off ice crystal faces that are constantly being oriented by the developing electric field just above the [cumulonimbus] top. Then there is a discharge in the cloud, and the field collapses momentarily, and the crystals begin to realign again. Then this just keeps happening over and over.
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