A WEATHER warning has been issued for fog.
A third yellow weather warning has been issued by the Met Office for areas of freezing fog, some dense, which has started to form this afternoon.
It is likely to remain in place overnight into Wednesday morning.
A spokesman said the fog will become more widespread through the night, with icy patches on untreated roads and paths an additional hazard.
Travelling conditions will be difficult with journeys likely to take longer than usual and delays to air travel are possible.
The Met Office's chief forecaster said: "Stagnant air will remain across the area, allowing fog to form readily.
"Frost deposited by the fog will give surfaces an icy covering which may be thick enough to make roads and pavements slippery."
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