Why in the world make such a big thing out of this? Expect your dog to not react and just go with the flow. Your pup will read your energy and mirror you. Act like it it nothing, communicate the "meh! Borrriiinnng" reaction to your pup. Do not coddle him if he is unsure, it is rewarding attention for behaviour you do not want to encourage.
Go about your normal routine, and make a point of having some fun play time during the storm so your pup associates it with positive emotions.