My Schuyler (white cat in avatar) is the only cat I have ever encountered that is unsettled by thunderstorms. I would not call it a phobia as he is not freaking out by hissing and fluffing his fur, but he does try to seek a safe haven which is usually under the bed. During the last T-storm I noticed him trying to get into my opened cabinet under the kitchen sink! There is no room since there because I keep my trash bag attached to the inside of the cabinet door, and I keep my cleaninig products under the sink. But he was bound and determined, poor guy!

The article was helpful and I will try the suggestions in order to desensitize him the next time any boomers hit.