Met Office yellow fog warning raises risk of UK travel delays

A Met Office yellow weather warning for dense fog is in force across parts of England and Wales this evening and into Monday morning, with forecasters highlighting a risk of hazardous driving conditions and broader travel disruption.

Where the fog warning applies and how long it lasts

According to the Met Office warning service, a yellow fog warning covers swathes of central and southern England and parts of Wales from 18:00 on Sunday 8 November until 11:00 on Monday 9 November 2026. The area includes sections of key trunk routes and motorways, with reduced visibility expected overnight and during the Monday morning rush hour.

Regional coverage from local outlets indicates that locations such as Milton Keynes, Buckinghamshire and parts of Derbyshire fall within the warning area, with similar alerts issued for other inland counties. These areas are expected to see patches of dense fog forming during the evening, becoming more widespread in the early hours before slowly lifting through the morning.

Met Office guidance notes that yellow warnings are used when weather is likely to cause low to medium level impacts, including disruption to travel in some places. While many journeys can still be completed, a proportion of road users and public transport services may experience delays or need to adjust plans at short notice.

The forecaster also stresses that warning areas and timings can be updated as conditions evolve. Drivers and passengers are encouraged to check the latest forecast and warning map before setting out, particularly for early morning journeys on Monday.

Expected impacts on roads, rail and air travel

The current yellow fog warning highlights the potential for slower journey times on roads, with the possibility of delays to bus, coach and rail services where visibility deteriorates significantly. Published guidance states that thick fog can obscure hazards, junctions and signage, increasing braking distances and making it harder for drivers to react in time.

Fog is also identified as a risk factor for air travel. Public information from airports and airlines indicates that low visibility can lead to changes in landing and take-off schedules, including diversions and cancellations where conditions fall below safety thresholds. The Met Office notes that flights and, in some coastal areas, ferry crossings may be affected when visibility drops.

Rail operators may impose reduced speed limits on sections of line affected by fog, which can lengthen journey times even where services continue to run. Transport providers are advising passengers to allow extra time for connections and to monitor live service updates throughout the warning period.

For local road networks, emergency planning documents that draw on Met Office data describe fog as a hazard that can quickly change in extent and intensity. Conditions may vary over short distances, with drivers moving from clear air into dense fog banks in a matter of seconds, particularly on rural routes and in river valleys.

Advice for drivers heading out in foggy conditions

Public safety advice based on Met Office guidance emphasises that the safest option is to delay or avoid journeys where possible if dense fog is forecast along the route. When driving is essential, road users are urged to prepare carefully, checking their route for any incidents or closures and ensuring that all lights, including fog lights, are working correctly.

Motoring and road-safety organisations recommend reducing speed well below the posted limit when visibility is significantly reduced, while maintaining a greater distance from the vehicle ahead. Braking and steering should be gentle to avoid skids on damp road surfaces, and sudden manoeuvres should be avoided, especially on high-speed roads.

Drivers are also advised not to rely on the rear lights of the vehicle in front as a navigation guide, as this can encourage following too closely and reduces reaction time if that vehicle brakes sharply. Instead, lane markings and reflective roadside furniture can be used as reference points where visible, and drivers should be prepared for pedestrians, cyclists and slow-moving vehicles to be more difficult to spot.

Guidance from government-backed road safety campaigns highlights that fog lights should be used when visibility falls below 100 metres and switched off once conditions improve to avoid dazzling other road users. Screens and windows should be kept clear of condensation and misting, with ventilation and demisting systems set appropriately before setting off.

Understanding Met Office warning colours and travel risk

The Met Office operates a colour-coded warning system, with yellow, amber and red categories used to describe the combined likelihood and impact of severe weather. Public information leaflets explain that yellow warnings can be issued for several types of weather, including fog, snow, ice, heavy rain, wind and thunderstorms, when some disruption is considered possible.

In the case of fog, a yellow warning typically signals that reduced visibility may cause travel delays for a proportion of road users and public transport services. Higher-level amber or red warnings would indicate a greater risk of widespread disruption or danger to life, and may be accompanied by stronger messages to avoid or significantly restrict travel.

Recent updates to Met Office guidance, introduced in October 2026, emphasise that members of the public should read the detailed text of each warning, rather than relying solely on the colour. This text sets out the specific hazards expected, the most at-risk locations and the types of impact considered most likely, such as delayed road journeys, cancellations on transport networks or interruptions to power supplies.

For travellers, understanding this framework can help with risk-based decision making, such as whether to bring departure times forward, switch to a different mode of transport, or postpone non-essential trips. Travel and tourism businesses also draw on these warnings when planning staffing levels, customer communications and contingency arrangements.

How travellers can plan ahead while the warning remains in force

While the current fog warning is scheduled to expire by late morning on Monday, forecasters note that patches of mist and fog could linger in sheltered areas even after the formal warning period ends. Travellers planning early departures, airport transfers or long-distance drives are therefore encouraged to build in additional time and flexibility.

Publicly available travel advice suggests checking multiple information sources before leaving home, including regional road cameras where available, traffic bulletins and live departure boards for rail and air services. Accommodation providers and tour operators may also share updates on local conditions with guests, particularly where transfers are affected.

For those already on the road when fog thickens, safety leaflets advise finding a safe place to stop if visibility becomes severely restricted, such as a designated service area or official parking lay-by away from moving traffic. Stopping on the hard shoulder of a motorway or on the carriageway itself is strongly discouraged except in an emergency.

With further seasonal weather expected in the weeks ahead, the Met Office is encouraging the public to stay familiar with its warning service and to sign up to channels that provide timely updates. For drivers, this period is being framed as an opportunity to review vehicle readiness for winter, including tyres, lighting and emergency kits, so that they are better prepared for any future warnings affecting travel.