A YELLOW weather warning has been issued by the Met Office, with dense fog set to bring “difficult travel conditions” this evening and tomorrow morning.

The weather warning will be in place from 4pm today (Thursday, December 1) until 11am on Friday.

All of Somerset and parts of Devon are contained within the yellow weather warning zone, which also covers parts of Wales, Birmingham and Oxford.

Fog warning are issued when visibility is expected to fall below 200 metres. Severe disruption to transport occurs when the visibility falls below 50 metres.

The Met Office said there will be “areas of fog bringing some difficult travel conditions Thursday evening and overnight into Friday morning”.

People have been told to expect “slower journey times with delays to bus and train services possible”.

Travellers have also been warned of “a chance of delays or cancellations to flights”.

The Met Office tells motorists to avoid travelling in fog they can. If they must travel, they should “drive very slowly with dipped headlights”.

Full-beam lights can reflect off the fog, causing a “white wall” effect. 

Drivers are also urged to watch their speed as “fog can give the illusion of moving in slow motion” and use fog lights (but switch them off when visibility improves).

They have also been warned of “freezing fog”, which is made of water droplets that can form a layer of ice on roads or pavements. 

For more information, visit www.metoffice.gov.uk/weather/warnings-and-advice/seasonal-advice/travel/advice-for-travelling-in-fog.