London Fog Warning: Heathrow And London City Flights Cancelled As Visibility Plummets

Flights at two major London airports have been cancelled as thick fog blankets the capital, disrupting air travel on Monday morning. Heathrow and London City Airport have reported cancellations amid warnings that visibility could fall to 50 metres or less in some areas.

The Met Office has issued a yellow weather warning covering London and much of the South East until 11am, cautioning commuters about difficult travel conditions.

London Fog Warning Disrupts Heathrow And London City Flights

Air passengers faced disruption on Monday morning as dense fog affected operations at Heathrow and London City airports.

By 6.30am, seven flights at Heathrow and three at London City had been cancelled, with further disruption possible as weather conditions developed. Travellers have been advised to check their flight status with airlines before leaving for the airport.

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The Met Office warning covers London and large parts of the South East, where reduced visibility could affect transport networks. Forecasters warned that visibility in some locations could drop to 50 metres or below, creating challenging conditions for motorists and other road users. The warning remains in force until 11am, although the time taken for fog to clear may vary between locations.

Met Office Explains Why Dense Fog Is Covering London

Met Office operational meteorologist Niamh Murray said the current weather conditions were the “perfect recipe” for fog to develop. Speaking to the Press Association, she explained that longer nights during autumn and winter allow temperatures to fall for extended periods. This cooling brings the air closer to the point at which moisture condenses and fog forms.

“With autumn and winter and getting fog during this time of year, we get much longer nights, and that allows temperatures to fall away,” Murray said.

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“We get a longer period of cooling and also the temperatures are much lower, so they’re much closer to the temperature that we need for the air to become saturated and therefore form fog.”

She also highlighted the role of light winds in creating suitable conditions for fog to form and persist. Clear skies and prolonged overnight cooling can contribute to the development of dense fog, particularly when temperatures approach or fall below freezing. Murray warned that fog could prove stubborn to clear if temperatures drop into negative figures.

“Another thing that we need to form fog is quite light winds, not absolutely no winds.

“We just have the perfect recipe at the moment: light winds, clear skies, long nights, to allow that fog to develop. And particularly if we see the negative numbers (temperature in degrees Celsius), it can quite stubborn to clear the next day.”

London Fog Warning Prompts Travel Safety Concerns

The weather warning has also raised concerns about road safety, with motorists urged to take extra care in areas affected by low visibility. Drivers may encounter sudden changes in visibility, making it harder to judge distances and react to traffic ahead. Travellers have been advised to allow additional time for journeys and follow updates from transport operators and weather authorities.

The warning follows a serious motorway collision involving more than 30 vehicles during foggy conditions, which resulted in the road being closed for nearly 12 hours. The incident highlights the potential dangers associated with driving in dense fog, particularly when visibility deteriorates rapidly. Motorists should reduce speed, increase the distance between vehicles and use appropriate lights when conditions require them.

With fog continuing to affect parts of the capital and surrounding areas, passengers should monitor airline updates and check the latest Met Office forecasts before travelling. Airport operations and road conditions may change as visibility improves throughout the morning. Further delays remain possible while the weather warning is in effect.