Here's why this kind of accident is bound to happen

You get radioactive waste underground, including lots of alpha emitters like plutonium, uranium, neptunium etc
They emit alpha particles, positively charged
the positive charges spread out and will attract more rain (storms, you know, are full of negative charges, that's what make lightning happen) than what's usual - radioactive waste storages are usually on clay

Here's more demonstration https://uraniumisagenocidegiant.com/2019/09/06/tracking-actinide-fallout-with-rain-levels-suivre-les-retombees-de-poussieres-emettrices-alpha-avec-la-pluie/