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Originally posted by SLAYER69
I have seen a very similar effect myself which turned out to be laser lights from the roof of a building directed up onto the clouds. It acted as an advertisement when discos were in progress. My guess is that is exactly what we have here, a display laser, or powerful spotlight, reflecting off low level clouds. If the colour is genuine, and not an effect of enhancement, this would suggest a laser rather than a spotlight. The one I saw was from a source ten miles away, these things can be seen from quite a distance, and was ordered not to be used anymore as it was considered to be a hazard to aircraft using a nearby airport. Makes an interesting effect though.