A flypast to mark the King's Coronation could be cancelled due to poor weather on Saturday.
Royal Air Force Air Chief Marshal Sir Michael Wigston has said "it's 50/50" as to whether the event will go ahead, and the final decision will be made just one or two hours before it is due to start. Forecasters expect conditions in London to be cloudy and wet on Saturday, which could hamper the ability of pilots to fly safely.
More than 60 aircraft from the Royal Navy, British Army and Royal Air Force - including the Red Arrows - are scheduled to fly over The Mall and Buckingham Palace at around 2.15pm. The King and Queen Consort are due to appear on the palace balcony with other members of the royal family to watch the six-minute flypast.
