I've heard that is a storm is really looking to be bad -
unplugging all expensive electronics is best.
refrigerator, TV, microwave, computer, etc.

Just turning them off doesn't always protect them.
The power spike/surge can travel thru the lines sometimes.

It doesn't happen very often but when it does it's expensive to replace those things.

It happens here every few years, someones tv explodes or something...
the home wasn't grounded or had other wiring issues.

but if it's bad I unplug to be safe until the storm is gone.