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I would like to add something about modern house wiring. I have stated this before. There is a large antenna in the walls of most modern homes. A Carrington like event will ruin many peoples day. There are ways to mitigate that effect. The National Electric Code should be changed to revise home construction and retrofit. For those that don't, best to keep some fire extinguishers around. The majority of the electric surge is not going to come from without the house, but within it.

Talk about your uneven ground potential... LOL

I'll never forget. Around 1987 I think. We had just turned up a small remote site and had noise complaints from customers. The Grounding Engineer pulled out an old hand held transistor radio from his pocket. He shoved the tuner dial all the way over as far as it would go and started walking around the raised floor. He found several raised floor pedestals that were acting as antennas. That was just his quick check. He pulled out all of his high tech gear to verify and isolate the problems. There was also a nearby ATC Radar site that was interfering.

So, in addition to the house wiring, other factors could exacerbate the situation you described. Multiple ground taps on different points on cold water pipes... etc.