In article <19mrd0p0gac2ntokf0uqnel7njqpkiagev@4ax.com>, chasm@texas.net 
says...
> that would certainly account for the striking impact of this really beautiful
> sunset and the totally unexpected lightning.
> 
> is there anyway to actually point at this and that to know that this was a
> composite??
> 
> thanks

Well, besides the complete absurdity of the weather conditions present, 
there are some harsh, "too perfect" gradients along the lightening path 
and especially at the "impact point" on the ground.  If you've tried 
making composite images look real, you can notice the flaws pretty 
quickly.