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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.
Coastal areas dealt with a bit of patchy, dense fog Thursday afternoon as temperatures dropped to some of the coolest San Diegans have felt this work week. Coastal fog with near 80 degree weather ...
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.
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.
The list of cloud types groups all genera as high (cirro-, cirrus), middle (alto-), multi-level (nimbo-, cumulo-, cumulus), and low (strato-, stratus). These groupings are determined by the altitude level or levels in the troposphere at which each of the various cloud types is normally found.
Two people were killed and nine others were injured Saturday in a massive pileup north of Los Angeles that involved as many as 40 vehicles in foggy conditions on Interstate 5, authorities said.