Flood and weather warnings in place across Wales
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The National Weather Service said the fog could lead to black ice and limited visibility, and urged drivers to exercise caution.
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A yellow weather warning for strong winds which could cause some short-term loss of power has been issued for Wales. West and north Wales are expected to bear the brunt, with the warning in place from 22:00 GMT on Monday until 16:00 on Tuesday, the Met Office has said.
Olympic and Cascade mountains are expected to see 8 to 10 inches of rain, while rivers such as Snoqualmie and Skykomish are set to experience major flooding.
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