If I cannot count to 10 between thunder clap and lightening flash, I pull the plugs. On everything. Twice now we have have lightening hit nearby and create backup surges and ruin a lot of expensive electronics, including the refrigerator. NOW I know to pull the plugs for the duration. Usually doesn't last long, and saves a lot of money on replacement. I sure would not want to replace my computerized machine and lightening is not covered by homeowners