Yellow fog alert disrupts travel across South East England

Thick overnight fog has triggered a yellow weather warning across large parts of South East and eastern England, with travel services and road users advised to expect slower journeys and possible disruption through Monday morning.

Extent and timing of the fog warning

According to publicly available information from the UK’s national weather service, a yellow fog warning is in force from 18:00 on Sunday 8 November until 11:00 on Monday 9 November 2026. The alert covers a broad swathe of England, including much of London and the South East, the East of England and parts of the Midlands, with conditions also extending into some northern and western regions.

Regional breakdowns show that the warning area takes in counties such as Essex, Hertfordshire, Norfolk, Suffolk, Bedfordshire and Cambridgeshire in the East of England, alongside Greater London, Kent, Surrey, Sussex, Hampshire, Oxfordshire and Buckinghamshire in the South East. Further north, affected areas include Lincolnshire, Nottinghamshire, Derbyshire, Leicestershire and Northamptonshire.

Forecast guidance indicates that widespread fog formed during Sunday evening under clear skies and light winds, with some patches becoming dense enough to reduce visibility to below 50 metres. Publicly accessible forecasts state that the fog is expected to be slow to lift and clear on Monday morning, especially across central southern and eastern counties, before gradually thinning into low cloud or hazy sunshine later in the day.

National warning pages highlight that this is a yellow alert, signalling a combination of moderate potential impacts and a relatively high likelihood of occurrence. Travellers are being advised to monitor updates through Monday morning as the precise extent and density of fog can change quickly over short distances.

Travel disruption expected on roads, rail and in the air

Warning details summarised by the Met Office and reported by broadcasters including Sky News and ITV News indicate that slower journey times are likely across the road network where fog becomes thickest. Reduced visibility on major routes such as the M25, M1, A1(M), M11 and M23 is expected to lead to cautious driving speeds, localised congestion and longer journey times around key commuter periods.

Publicly available travel advice linked from the warning notes that delays to bus and train services are possible, particularly on early-morning services into and out of London and other major hubs across the South East and East of England. Low visibility at key junctions, signals and level crossings can require additional safety checks, which in turn can lengthen journey times.

Aviation impacts are also highlighted in the current guidance. The yellow fog warning coincides with early departures and arrivals at airports including Heathrow, Gatwick, Stansted, Luton and London City, all of which are located within or close to the warning area. Published coverage notes that there is a chance of flight delays or cancellations where visibility falls below the minimum thresholds required for safe take-off and landing, especially at times of peak traffic.

Travellers are being encouraged, via airline and rail operator updates, to check the status of services before setting out and to allow extra time to reach stations or terminals, as transfers and connecting road journeys are also likely to be slower than usual in thick fog.

Conditions creating a ‘perfect recipe’ for dense fog

Meteorological summaries referenced by UK news outlets describe the current pattern as a “perfect recipe” for fog development, combining high humidity near the surface with light winds and clear overnight skies. These conditions allow heat to escape rapidly from the ground after sunset, cooling the air near the surface until it becomes saturated and condensation forms as tiny water droplets suspended in the air.

Reports indicate that the warning area stretches from roughly York in northern England down towards Bath in the south, taking in much of South East and eastern England along the way. Within this broad zone, the densest fog is expected in low-lying rural areas, river valleys and locations sheltered from any breeze, though urban centres and higher ground may also experience significant reductions in visibility.

The national severe weather warning framework describes yellow alerts for fog as events where visibility may fall below 200 metres over a wide area, with some local pockets dropping to less than 50 metres. Under these conditions, familiar landmarks, road signs and junctions can be difficult to see until vehicles are very close, increasing the risk of sudden braking, missed exits and minor collisions if drivers do not adjust their behaviour.

Forecasts for the days ahead suggest that once this episode clears, no further fog warnings are currently in force for midweek across London and the South East. However, outlooks for late November point to generally changeable conditions, and further episodes of mist and fog remain possible as nights lengthen and temperatures fall.

Advice for drivers and public transport users

Driver guidance published alongside the yellow warning emphasises the importance of reducing speed, increasing stopping distances and using lights correctly in foggy conditions. Motorists are advised to check that dipped headlights and fog lights are working before travelling, and to use fog lights when visibility drops significantly, switching them off again once conditions improve to avoid dazzling other road users.

Travel information services recommend leaving extra time for journeys, especially during the Monday morning peak when the fog is expected to be slow to clear. Drivers are encouraged to avoid sudden manoeuvres, use road markings to help judge position on the carriageway, and be prepared for pedestrians, cyclists and slower vehicles to appear with little warning in areas of very low visibility.

For those using trains, coaches and domestic flights, operators are using their usual channels to advise customers to check for revised timetables, platform changes or short-notice cancellations. Even where services are running, boarding and turnaround times can be extended in poor visibility, so passengers may wish to adjust connections or allow contingency time at interchanges.

Travellers with fixed appointments, such as onward international flights or time-sensitive meetings, are being encouraged in public-facing guidance to consider earlier departures or alternative routes where feasible, particularly from areas repeatedly highlighted as likely to retain dense fog through the mid-morning period.

Impact on tourism and outdoor plans

The yellow fog warning coincides with the Remembrance Sunday and early winter tourism period, when visitors often travel into London, coastal resorts and historic towns across the South East and East of England. Attractions such as seafront promenades, city viewpoints and countryside trails are expected to remain open, but visibility on higher ground and along exposed coastlines may be significantly reduced during the warning period.

Destination forecasts show temperatures during the fog event hovering in the single digits Celsius for many locations, with the combination of damp air and light winds making it feel colder. Visitors planning early-morning activities, including photography outings, birdwatching on estuaries or walks in national parks and Areas of Outstanding Natural Beauty, may find that views are obscured until late morning.

Tourism operators and accommodation providers are using social media and customer newsletters to advise guests to build flexibility into their schedules, focusing on indoor attractions, museums, galleries and restaurants during the first part of the day. In cities such as London, Cambridge, Norwich, Oxford, Brighton and Canterbury, many major cultural sites are within short walking distance of public transport hubs, helping visitors to minimise time spent on congested roads.

For those travelling onward after the fog has cleared, publicly available outlooks suggest more settled, if still cool, conditions for much of the week across southern and eastern England. Nonetheless, forecasters continue to encourage travellers to stay aware of updated regional forecasts and warning pages, as further seasonal hazards such as frost, ice and low cloud are likely to feature as November progresses.