IANAL but, you should be in contact with your airline about your specific flight.

You are entitled to be re-booked on the next available flight or get a refund. If you take a refund the airline has no obligation to you anymore. You might find after taking a refund, the price of an equivalent flight is now much more.

I know - but I'm going to a concert in London, if the flight isn't going at its original time then there's no point going. I'll just take a refund and drive instead, but so far it looks like flights will operate as normal tomorrow.