Right so this is something I've been thinking about for years and nobody ever wants to take it seriously. I grew up near the coast here in Whitby and storms roll in hard off the North Sea, and I swear the correlation is not nothing.
My working theory, for what its worth, is that it's got something to do with electromagnetic field fluctuations during heavy electrical storms. There's decent research suggesting that strong EMF variations can affect human perception, which the sceptics love to use to debunk everything. But flip it around - if those fields affect us, why wouldn't they affect whatever is producing the activity in the first place? Could be a power source thing. Could be that the conditions just make the veil thinner, if you want to go more traditional about it.
I've logged three separate incidents at a property I investigated back in 2019 and all three coincided with thunderstorms. That's not a sample size you'd publish a paper on, I know. But I'd genuinely like to know if others have noticed this pattern or if I'm just connecting dots that aren't there.