Dense Fog Prompts Travel Warning Across Southern England
By Google News Category Travel Advice ·
Thick overnight fog has triggered a widespread weather warning across southern England, with reduced visibility disrupting Monday morning travel on key road, rail and air corridors serving London and the South.
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The UK Met Office has issued a yellow warning for fog covering much of southern and central England, including London, the South East and parts of the South West, during the morning of Monday 9 November 2026. Publicly available forecasts indicate that the warning window runs from Sunday evening through late Monday morning, with visibility in some locations reduced to around 50 metres.
The latest warning narrative highlights fog that became increasingly widespread overnight before only slowly lifting through the morning period. The slowest improvement is expected across central southern England and parts of the West Country, where patches of dense fog are forecast to linger into late morning.
Local coverage from counties such as Hampshire and Gloucestershire describes conditions of very poor visibility on exposed stretches of dual carriageway and motorway, including approaches to the M3, M4 and A34, where drivers are being advised to allow extra journey time. In these areas, fog is reported to have persisted from shortly after sunset on Sunday, thickening into the early hours of Monday.
The current fog episode follows a broader pattern of calm, high-pressure weather across the UK at the start of November. Recent analysis from the Met Office notes that such settled spells are often associated with overnight mist and fog, especially across southern, central and eastern England where light winds allow cold air to trap moisture near the surface.
On the roads, the fog warning carries a specific reference to slower journey times for motorists, with the greatest impact on busy commuter corridors feeding into London and regional hubs across southern England. Travel information sites and regional media are reporting patches of dense fog on sections of the M25, M3, M4, M27 and A303, as well as on rural A-roads where there is little street lighting.
Publicly available guidance for drivers under a yellow fog warning stresses the risk of sudden changes in visibility rather than a uniform blanket of fog. Motorists may encounter clear conditions that rapidly give way to dense patches, particularly in river valleys and low-lying sections of road. This pattern has been highlighted along stretches near the Thames Valley and across parts of Hampshire and Wiltshire.
National motoring organisations routinely advise the use of dipped headlights and fog lights where visibility drops below 100 metres, as well as extended following distances and lower speeds. Current advice being circulated through regional travel bulletins reinforces these points and encourages drivers to check local conditions before setting off, particularly for early-morning commutes or school runs.
Emergency planning documents published in recent years for several English local authorities identify dense fog as a recurring contributor to multi-vehicle collisions and major incident declarations on strategic roads.
While no large-scale motorway closures had been widely reported early on Monday, transport planners have previously noted that prolonged dense fog can quickly amplify the impact of minor incidents during the peak hours.
The fog has also raised concerns about air travel across southern England, particularly at London…
Originally published by Google News Category Travel Advice
