Do kittens always turn into Thundercats during their first rainstorm?

Loud noises do startle cats and may cause them to run around like that, but I doubt that it will make them permanently afraid of thunderstorms. One of my cats takes off at any sudden noise and hides. The others pay no attention. Rosie (the scaredy cat) seems to have been permanently traumatized by other events. She was a tiny kitten, crying under my shrubbery when I found her. I took a couple of days putting out food and getting closer until she allowed me to pick her up and bring her inside. She was fine until a couple of weeks later. I was going on a trip and was getting ready to take her for boarding. I picked her up and suddenly she sensed that I was up to something and started slashing at me. I knew I wouldn't catch her again if I let go, so I hung on to her and got her into the carrier. When I arrived at the vet's and set her on the counter, the girl looked at my bleeding arms and said, with a perfectly straight face, "Would you like to have her declawed while she's here?" I don't believe in declawing and normally wouldn't, but I figured in her case it was probably necessary. She was friendly when I brought her home, but while preparing their food I stepped back and accidentally stepped on her paw. That was 4 or 5 years ago and she has remained very skittish ever since. That's kind of a long story, but it illustrates that you never know if a cat will retain their phobias. Most of them don't, but in her case, I have a cat who merely tolerates me.