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
Milder for most of us
In her Brexit speech on Tuesday, the Prime Minister is set to urge the EU to forge a fair trade deal or risk commercial war.
B-Street Band want to remain respectful to Bruce Springsteen, who supported Hillary Clinton in the US Election.