Dense fog threatens Monday morning rush-hour disruption

This video can not be played Watch: Thick fog blankets parts of England overnight The Met Office has issued a yellow warning for dense fog across much of England and eastern Wales running until on Monday. A separate yellow fog warning has also been issued for Northern Ireland and runs until. See warning details here, external. The larger fog warning for England and Wales covers an area of the southern UK stretching from Canterbury to Cardiff, Hull to St Asaph and Southampton to York, and includes London, Birmingham and parts of Greater Manchester. Visibility could fall to less than 50m in places, making driving difficult. Bus, train, ferry and flight services could also face delays or cancellations. Met Office yellow warnings for fog across parts of the UK on Monday morning The fog will gradually lift through Monday morning, although some patches could linger into the afternoon. Commuters are also experiencing a chilly start, with temperatures widely falling into low single figures and ground frost likely in many areas. Heathrow has advised anyone driving to the airport to allow extra time for their journey because "overnight fog has affected visibility on roads" in the area. "We advise passengers to check with their airline before leaving home and to drive with care," it said on X, external. Thick fog already blanketed parts of England and Wales on Saturday night, making an FA cup match between Altrincham and Notts County less of a spectator sport. It also caused a 30-car pile-up on the M20 in Kent, leaving two people seriously injured, as well as a 19-car collision on the A303 in Hampshire. Fog will be more widespread than Sunday night as clearer skies across England and Wales allow heat to escape quicker, causing temperatures to fall. Patchy fog could also develop outside the warning area in northern parts of the UK wherever skies remain clear for long enough. Fog forms when air cools and water vapour condenses into tiny droplets suspended near the ground, creating cloud at ground level. Mist forms in the same way but is less dense, with visibility generally greater than 1,000 metres (1km). Visibility of 50m or less can cause severe travel disruption. The Met Office advises drivers to check road conditions before setting off and use fog lights when visibility is seriously reduced. Allow extra time for your journey and adjust your plans if necessary. Patchy fog can be particularly dangerous because visibility can change suddenly.