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http://www.lightningmaps.org/?lang=en#x=0.6488;m=sat;r=0;t=3;s=0;o=0;b=;n=0;y=51.4784;z=8;
This is a cool site for following lightning. The little white circle radiating out from a strike is the sound wave, it's pretty accurate IME.
Lightning at least approx 20 kms away
https://www.metoffice.gov.uk/learning/storms/thunder-and-lightning/thunder
I'm now a fan of 'sound bending upwards'
=Met Office code for wormhole etc.