This is a fear for many people I have found out. Brontophobia - fear of thunder and lightning is common among people as well as dogs.
I have dog that also has the fear, I wonder if she got it from me.
Phobia Release was a great help for me when overcoming the phobia. I live in a state where we seem to have many thunderstorms with lightening and to overcome this fear was greatly needed.
I am now free of my fear and I thank you. I wish it could work on my dog, maybe some day some one thing about that one.