You are doing the right thing. During Hurricane Irene I had unplugged my sewing machine and both computers.Turned out to be a good thing because when the tree came down and ripped out the power lines it also took out the ground feed wire at the electric pole. By doing this a charge of 220volts backfed into our house and fired the tv, lights,my ott light,fax machine and some other electrics.
Oh and when the tree made it past the power lines it landed on out cars and totaled both.
You ARE doing the right thing