After weeks of strong winds, heavy rain and tidal surges, the county is set to freeze under a blanket of ice.
Forecasters are predicting ground temperatures to fall below freezing tonight and into tomorrow morning.
Given the recent wet weather and the amount of standing water, the Met Office has warned the result could be large patches of ice on the roads.
A Met Office spokesman said: "With clearing skies and easing winds overnight Thursday temperatures will fall with surface temperatures dropping below freezing in places late on Thursday night and early on Friday morning.
"Large amounts of standing water remain on the ground in many places following recent wet weather and flooding.
"This will result in icy stretches forming in places, despite only small amounts of rainfall on Thursday."
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