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Originally Posted by Sam5
I’ve heard nearby short bolts and they do sound like a crack. If there is nothing for the sound to echo off of, all you will hear is the crack. A short bolt might sound like a quick “boom” if heard from a distance. Long bolts and with echoes will sound more like long rumbling thunder.
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I don't understand your second sentence; I haven't read the echo factor as being a reason why one hears a loud clap from a close lightning bolt. I've understood it to be the closeness of the sound waves. Maybe Cyswxman can elaborate (he's the meterorology man). But a crack or bang sound is thunder, and the point was that in the movie this alien lightning didn't produce thunder. Maybe I'm remembering wrong and each bolt produced a bang or crack in the movie, but I didn't think so. It should have produced sound, one way or another, if it was overhead or far away. I suppose if there was some temperature inversion bending the sound waves, maybe it couldn't be heard, but I think that's stretching it, and the professor doesn't mention that above. So, what was sensible in the movie?
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Sunset
Die Sonne scheidet hinter dem Gebirge. In alle Täler steigt der Abend nieder
mit seinen Schatten, die voll Kühlung sind.