Met Office explains why the fog is so bad in Wales – Wales Online

It’s no coincidence that it has come during a period of warm and humid weather, according to the Met Office
A Met Office forecaster has explained why parts of Wales have experienced heavy fog as beachgoers describe not being able to see the sea from the shore. People visiting Barry Island on Saturday said views were "post-apocalyptic" as thick mist spoiled their view.
Similar scenes were spotted in other parts of Wales on Saturday morning including Cardiff Bay and Langland Bay, which were also largely hidden by thick white fog as temperatures reached 25C. Explaining the phenomenon, Met Office forecaster Simon Partridge said it is no coincidence that this has happened during a period of warm and humid weather.
"We've had fog around the UK for a few days now and it's basically because we've got this very warm, moist air mass.," he said. "The air that's coming across the UK at the moment is very warm and moist hence why it's so muggy and horrible at night.
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He added: "As that goes over the colder sea, the water in the air then condenses down and turns into fog. It's fairly common in late summer when you get that warm air coming up from the south, so it's quite extensive at the moment. There is quite a lot of it over the North Sea and above the Irish Sea today as well as the western coast of northern England, Devon and Cornwall. It has also been on the east coast of England for a few days."
Simon said most of the fog will clear up over the next few days, but that means the warm weather is also likely to disappear too. He said: "Because we are expecting a few changes in the weather over the next few days the fog will clear, but unfortunately that will take away the warm air as well. We will see heavy thunderstorms in some areas tomorrow as well as fog, but then as we go into Monday and Tuesday there will be more in the way of rain, but less in the way of fog."
After days of scorching weather, the Met Office has issued a thunderstorm warning for the weekend, affecting a large part of Wales. The yellow weather warning is forecasted from 2pm until 9pm on Saturday, September 9. The weather agency warns that "a few heavy showers and thunderstorms are possible, perhaps leading to some disruption." The warning affects Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Powys and Wrexham.
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