A new yellow weather warning for fog has been issued for Wrexham and Flintshire, with visibility expected to fall below 100 metres in places overnight.
The warning was issued by the Met Office at 8.45am today (Monday, November 9) and comes after parts of the area experienced thick fog and poor visibility during the morning.
It will come into force at 6pm tonight and remain in place until 10am on Tuesday, November 10.
The Met Office says fog will redevelop across the warning area during the evening before becoming dense at times overnight.
Forecasters said: “Fog will redevelop across the area this evening, becoming dense at times overnight, with visibility reduced to less than 100 m.
“This will likely lead to some delays to transport and difficult travelling conditions. Fog will thin and clear during Tuesday morning.”
In North Wales, the warning covers Wrexham, Flintshire, Denbighshire and Conwy, while Powys is also included elsewhere in Wales.
It also extends across a large area of England, including neighbouring Cheshire West and Chester and Shropshire, as well as parts of the North West, Midlands, Yorkshire, eastern and south-eastern England and Gloucestershire.
The Met Office says slower journey times are possible, with delays to bus and train services.
There is also a chance of delays or cancellations to flights.
People planning to travel are being advised to check road conditions before setting off, leave extra time for their journeys or amend their plans if necessary.
Motorists should also make sure they know how to switch on their fog lights and check they are working before travelling.
The new warning follows a foggy start to Monday across parts of England and Wales.
The Met Office's wider UK forecast says fog should slowly lift through the morning, although some patches could linger into the early afternoon across parts of central England and Wales.
However, clearer skies across central and northern areas are then expected to allow fog patches to develop again overnight.
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The latest Wrexham forecast also indicates mist returning from around 4pm, ahead of the new yellow warning taking effect at 6pm.
The new warning has been given a high likelihood of between 50 and 75 per cent and a moderate potential impact.
It is currently due to expire at 10am on Tuesday, with the Met Office expecting the fog to thin and clear during Tuesday morning.
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