Low visibility conditions expected as yellow fog alert hits two areas

Published Mar 31, 2025

Warning: Yellow

To expect: Fog

Affected areas: London and South East England, South West England

Start time estimate: Wednesday 3am

End time estimate: Wednesday 10am

The Met Office has issued a Yellow fog warning for London and South East England as well as South West England until Wednesday morning. All local areas affected are listed below.

On Wednesday, a Yellow weather warning is in effect until 10am. The forecast suggests the regions concerned can expect to see significantly reduced visibility due to dense fog.

The Yellow warning for fog was announced at 3:08am on Wednesday, March 5.

A Met Office forecast said: “Patches of dense, locally freezing, fog have formed across the warning area, reducing visibility to less than 100 m in places. This will make for some tricky driving conditions. Fog will clear through Wednesday morning.”

What to expect

Slower journey times with delays to bus and train services possible; There is a chance of delays or cancellations to flights.

What should you do in thick fog conditions?

Give yourself the best chance of avoiding delays by checking road conditions if driving, leaving extra journey time, or amending plans if necessary. Make sure you know how to switch on your fog lights, and check they are working before setting off on your journey. Bus and train services, as well as flights and ferry travel may also be affected; check for updates from your travel company and follow their advice. Be prepared for weather warnings to change: when a weather warning is issued, the Met Office recommends staying up to date with the weather forecast in your area. For further details see Met Office Warnings & Advice.

Full list of local regions affected

London and South East England
Hampshire, Isle of Wight, Portsmouth, Southampton, West Sussex

South West England
Bournemouth Christchurch and Poole, Dorset, Wiltshire

What is a yellow weather warning?

The Met Office has three categories of weather warning, depending on the likely impact of severe weather and also how likely it is to strike in a particular area.

A yellow warning is issued when weather conditions are expected to disrupt travel and traffic and may impact on daily routines but are not likely to pose a risk to life or property.

An amber warning is more severe and advises people to think about changing their plans to minimise the risk.

A red warning means weather conditions are expected to be dangerous with widespread damage to property and a risk to life, with the public usually advised to avoid travelling.

The Yellow weather alert for fog will remain in place until 10am on Wednesday.