mist

The moisture forms low cloud, mist and fog, which then cannot lift and clear as the winds are so light and the sunshine at this time of year is so weak.

"Since the tomato factory has been there you have always been able to see a red and pink hue in the sky when there is mist or fog in the air," he added.

By the early hours of Friday morning, however, there will be some large areas of mist and fog patches forming just about anywhere across the UK.

Edinburgh awoke on 19 September 2014 with a blanket of mist soaking the stones of the old city.

Instead of dust and debris swirling around the core of strong winds, it is water mist whipped up from the surface.