When a storm comes along, my machines are all unplugged,and always have been unless I am using them. I have 2 surge protectors that they plug into so if the first one is not tripped, the 2nd will get it if they are plugged in.
Just a little something Dearest Grandmother in law passed along to me when I started sewing: always unplug your machines when not in use, then you know the lightning can never harm them. (and that advice I have always taken to heart).