Storms can cause slight shifts in ground potential, which may temporarily aggravate grounding issues, causing hum or static. If you only heard static during a storm but it went away afterward, it was likely due to temporary EMI or line noise.
BTW, Electronic Rust has nothing to do with lighting or thunderstorms. It is an informal term often used to describe corrosion or degradation of electronic components or circuit board traces, typically caused by moisture, oxidation, or chemical contaminants. It’s not actual rust (iron oxide), but it behaves similarly by slowly damaging the delicate metal pathways that allow electricity to flow.