21.   Advisories for dense fog were issued by the National Weather Service early Wednesday morning for the suburbs of New York City.

22.   But in the dense fog, we could not find the first tee.

23.   But more recently, a dense fog has formed around the company.

24.   By then the swamp had been shrouded in dense fog and two more soldiers had to be evacuated over land.

25.   By the time we reached the mountain top, the spectacular scenery was blanketed in a dense fog.

26.   Cold air will be trapped in the valleys of the central Rockies with dense fog along rivers.

27.   Complicating problems, he said, was the dense fog that made it difficult for medical evacuation helicopters to land and take off.

28.   Dense fog shrouded the central Gulf Coast on Thursday and Friday mornings.

29.   Dense fog will be trapped in the valleys of the Northwest until winds from the south develop later on Wednesday.

30.   Dense fog will obscure the west slopes of the southern Appalachians.