To help your cat feel comfortable ensure they have a safe, warm and easily accessible place to sleep and hide inside. This can be an igloo, cardboard box, even the top of a cupboard whatever your cat feels most comfortable in.
Ensure all doors, windows and cat flaps are locked so that your cat cannot escape should they try to bolt.
Provide them with plenty of litter trays to use especially if your cat is used to toileting outdoors - we even suggest one per cat plus one extra!
Playing relaxing music or watching TV can also help to muffle the loud bangs, and having fun toys to hand, such as treat balls can certainly help provide a distraction from what is going on outside.
If you have more than one cat, ensure you have separate feeding stations and water dishes as well as plenty of elevated hiding places for them to escape to.