There is a rather late tropical storm on Atlantic that has hit Ireland and UK today causing flight delays and cancellations.
British Airways has issued a travel waiver on its website (access here) dealing with flights from select airports over these two days.
Here’s the announcement from BA:
You have to remember that duty to care does apply even on case of cancellations that are due to force of nature. BA and other airlines are required to provide duty to care per EC 261/2004 and rebook affected passengers to their final destinations at the earliest opportunity.