What to do first.
Is there lightning close to your premises? If there is lightning striking close to you then it’s a good idea to take some precautionary measures. You need to physically unplug all devices and appliances from the socket.
Once this is done time to put your feet up, literally. If your house is struck by lightning you can protect yourself from ground dispersing current spike by adding extra insulation between you and the floor, one thing you can do is sit down on your sofa couch or lounge and put your feet up on it. This way any potential difference between your feet has been eliminated. If your house is higher elevation or is built on such as ground with rich iron in the soil you may receive more lightning strikes than is otherwise probable. In order to protect your house in this case read the following article dealing with lightning protection.