A statement on the Met Office’s website said: “Dense fog patches have formed overnight with visibility less than 100m expected in places at first on Wednesday morning. The fog is expected to clear by mid-morning.”
The statement added this could lead to the potential for “slower journey times with delays to bus and train services”.
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The warning also highlighted possible delays or cancellations to flights.
Once the fog clears, the rest of the day is expected to be another fine Spring day with clear skies and sunshine.