Do You Unplug Equipment During Thunderstorms?

My current system is on a dedicated 20 amp circuit supplying power through a hardwired isolation transformer, and then a non-sacrificial  line conditioner/surge protector/voltage regulator. We don't get that many thunder storms in my area, but the the service has an annoying habit of randomly blinking off and on with accompanying brown outs and surges, necessitating the protection I use. 

As one person above said, if there is a ground strike near your house, it raises potential of the ground in the immediate vacinity to incredibly high voltages which feeds back into anything that is connected to the house ground AND POOF

Whole home surge protectors generally prevent a surge on the power phases of the supply, but not on the ground

We had a ground strike on our street and it caused damage in about a dozen houes and the cost came to many thousands and the damage varied widely from one house to the next. Fridges, underfloor, heating, tv, networking devices on surge protectors, nothing was safe. Some houses had house surge protectors.

And our power lines are burried

Regards

My system if plugged into 2 Furman surge protector power strips. I always turn off the strips when storms are present but dont bother unplugging the strips. Takes 2 secs to turn off the strips.

I had lightning strike a tree to the side of my house, it travelled across granite underground to to rebar in my foundations, jumped to internal power, ethernet and coaxial, took out every router, pc, tv, amplifier

Yes even with a whole house surge protector.