Boardwalk,
This is an extreme legit fear, but nothing I dont believe he should be medicated for, therapy perhaps yes. I was the same way when I was younger, I used to cry, shake and pray during storms, I lived for winter time to come, only time I could relax, even when it came to summer, it could be a beautiful day, but if I saw one dark cloud(not even an impending storm), I want to go home and crawl up into a ball. I also happened to be apart of the April 1974 tornadoes, I was twelve, our house was not hit, but just seeing the sky, the wind, all the damage is enough to affect you. He slowly needs to be desensitized to being attuned to the weather, it will not be an overnight thing, and always reassurance for him, no matter how long it last. I eventually only hated severe storms that came with the warnings on the screen, I had packed up my kids to take shelter before any issue of tornadoes came. Ironically, since I developed PD at age 28, storms dont even bother me anymore, I guess Im more attuned to my physical symptoms, and that extreme fear of storms completely ceased.
Hang in there,
Trish