Cloudless lightning
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BBC reports that one of today’s lightning strikes in Europe (in Germany I think) was from a clear blue sky. The theory (no pics):
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Lighting Less Cloud – quick as a flash, MikeL, a neat phrase which Andrew Kirk would appreciate, I think, since he invented ‘duskular’. It serves well your purpose as you develop your Cloud Art Form.
I think ‘Cloudless lightning’ should more properly be called ‘Clear-air lightning’ e.g.
https://en.wikipedia.org/wiki/Lightning says:
‘Clear-air lightning describes lightning that occurs with no apparent cloud close enough to have produced it. In the U.S. and Canadian Rockies, a thunderstorm can be in an adjacent valley and not observable from the valley where the lightning bolt strikes, either visually or audibly. European and Asian mountainous areas experience similar events. Also in areas such as sounds, large lakes or open plains, when the storm cell is on the near horizon (within 26 kilometres (16 mi)) there may be some distant activity, a strike can occur and as the storm is so far away, the strike is referred to as a bolt from the blue.[56]’Paul Simons’ column Weather Eye in The Times (UK) 30MAY16 was devoted to the Euro lightning on Saturday last, but he does not mention clear-air lightning. I think he missed a trick (unlike MikeL).
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Paul Simons did clear air lightning in his column 18JUN16. He also adds positive lightning – see 5.1.1 in
https://en.wikipedia.org/wiki/Lightning
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