I should note that some reported objects obviously do reflect RADAR signals - they are tracked, as in the Iran case. Distance, the RADAR signal strenth at the source, and the return signal strength might provide some information wrt to energy transferred or lost. What I don't know is if this information could be applied to existing models for ball lightning or other anomalies. I remember SelfAdjoint commenting in this context that some model for soliton waves appears to be opaque at RADAR frequencies, but that's the end of the road for me. I'm not an expert on high-energy plasmas, assuming that is what's involved. Nor do we have a good model for ball lighting.It's an intriguing observation. I think you ought to compile a list of all the incidents you've read where this seems to be happening and then look for any other commonalities.