Overview
- The warning runs from 4:00 to about 9:45am on Wednesday, December 3, covering areas of the East Midlands, East of England, London and the South East, the South West, the West Midlands and parts of Wales.
- Forecasters say the fog will be most dense in rural spots with visibility dropping below 100 metres in places, leading to difficult driving conditions.
- Slower road journeys and possible delays or cancellations are expected across buses, trains, flights and ferries, with services linked to Heathrow and Luton particularly vulnerable.
- Drivers are advised to check conditions, allow extra time, use dipped headlights and fog lights where appropriate, and maintain greater distances from the vehicle ahead.
- Fog patches are expected to lift through the morning, though low temperatures may allow droplets to freeze on surfaces in some areas, briefly increasing the risk of ice.