Heathrow Airport has announced its flight schedule tomorrow will be reduced by 10%, the equivalent to 130 flights.
It said the decision was taken to minimise expected disruption caused by low visibility, which forecasts show is highly probable.
Details of which flights will be cancelled will be announced by airlines when they have finalised their schedules.
Passengers due to fly were urged to check the status of their flight with their airline before travelling to the airport.
More top news
The odd light shower may appear across Scotland and Northern Ireland but for most of the UK it will be fine and dry.
Four men have been jailed for a plot to exchange guns by hiding them in a wheelie bin.
Jeremy Corbyn has urged young people across Britain to "step up", register to vote, and "claim your future" ahead of the upcoming election.