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Great capture... Lots of cloud-to-cloud action there.
I used to shoot a lot of lightning, especially in Film. But with Digital, if you captured it in Raw, you might try playing with the color temperature / White balance. I'm noy saying that yours needs color correction, but many times the clouds are illuminated by the lights of the city and take on the color of the lights or some other unusual colors. In some cases a Tungsten WB works really well for truing-up the colors (or sometimes a dual layer hybrid).
This is true also for DSLR star shots, in areas with some light pollution.
my 2-cents worth...
Thanks for sharing,