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The widespread fog will linger into the weekend before dissolving but at a price. ... This map of the United States shows where National Weather Service dense fog advisories were in effect on ...
USA TODAY's detailed map lets you explore snowfall accumulation over the past 24, 48, and 72 hours. You can also check seasonal totals starting from Oct. 1. Updated multiple times daily, this tool ...
Dense fog advisory NPW – Widespread or localized fog reducing visibilities of 1 ⁄ 8 to 1 ⁄ 4 mi (0.2 to 0.4 km) or less (up to 1 nmi [1.2 mi; 1.9 km] for marine-based advisories, depending on locally defined criteria) is occurring or is forecast within the next six to 12 hours.
If relative humidity is high (i.e., there is a small difference between the temperature and the dew point), mist or fog is reported, depending on the exact visibility. Fog is reported when visibility is 1/2 mile or less; mist is reported for visibilities greater than 0.5 miles (0.80 km) but less than 7 miles (11 km).
The international definition of fog is a visibility of less than 1 km (3,300 ft); mist is a visibility of between 1 km (0.62 mi) and 2 km (1.2 mi) and haze from 2 km (1.2 mi) to 5 km (3.1 mi). Fog and mist are generally assumed to be composed principally of water droplets, haze and smoke can be of smaller particle size.
Get the Boydton, VA local weather forecast by the hour and the next 10 days.
Fog is a visible aerosol consisting of tiny water droplets or ice crystals suspended in the air at or near the Earth's surface. [ 1 ] [ 2 ] Fog can be considered a type of low-lying cloud usually resembling stratus and is heavily influenced by nearby bodies of water, topography, and wind conditions.
Tule fog is a radiation fog, which condenses when there is a high relative humidity (typically after a heavy rain), calm winds, and rapid cooling during the night. The nights are longer in the winter months, which allows an extended period of ground cooling, and thereby a pronounced temperature inversion at a low altitude.