My assumption is that foo fighters are a different but related phenomena. Foo fighters were likely not weather, but a product of the aircraft themselves. The

My assumption is that foo fighters are a different but related phenomena. Foo fighters were likely not weather, but a product of the aircraft themselves. The most likely theory I've seen for foo fighters, is that the massive propellers on WWII era aircraft , spinning at high altitude in super dry air, collected a ton of static electricity, which caused a phenomena similar to ball lightning.