As a retire audio tech, I saw my share of lighting damage over the years. Unplugging is the ONLY way to totally protect your equipment, and that includes internet cable and any type antenna cables. Those also create a path to ground, and if connected, can be a source for damage.
lightning storm
listening to my new Maria Callas vinyl last night and a huge thunderstorm/lightning storm starts up. About 2,3 seconds before each boom, I was getting a lot of static through my speakers. EMI from the lightning? I have no idea so asking the group. Thanks. Smart ass answers accepted also :-)