Travel disruption is expected across large parts of the UK after the Met Office issued a weather warning for fog, describing atmospheric conditions as the "perfect recipe" for low visibility.
A yellow warning remains in place from 6pm on Sunday until 11am on Monday, bringing potential delays to bus and train services, alongside possible flight cancellations.
Stretching from York to Bath and covering much of the South East and eastern England, the alert zone will experience the densest fog, though low-lying cloud will also affect other areas.
Niamh Murray, Met Office operational meteorologist, said: "There is still going to be patchy fog elsewhere, just not quite as dense or as impactful.
"Parts of the West Country could still see fog, Northern Ireland, really anywhere across much of the UK, even into the central belt of Scotland."
Ms Murray explained that current seasonal conditions provide ideal elements for fog to form. "With autumn and winter and getting fog during this time of year, we get much longer nights, and that allows temperatures to sort of fall away," she told the Press Association.
"We get a longer period of cooling and also the temperatures are much lower, so they’re much closer to the temperature that we need for the air to become saturated and therefore form fog.
"Another thing that we need to form fog is quite light winds, not absolutely no winds.
"We just have the perfect recipe at the moment: light winds, clear skies, long nights, to allow that fog to develop. And particularly if we see the negative numbers, it can quite stubborn to clear the next day."
Near-freezing temperatures in rural parts of Wales, East Anglia and the Midlands overnight could make fog particularly persistent into Monday morning, with visibility falling to 50 metres or less in places.
From Tuesday to Thursday, forecasters expect "pretty welcome" rain across the country.
"Most places are likely to see 10 to 20mm and there is a chance that we could see some places seeing 30mm," Ms Murray said.
"But across the South West, where severe drought has been declared and is still enforced by the Environment Agency, there is a chance that we might see some very slow-moving rain, and you could see potentially accumulations up to 50 to 70 mm."
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