Radiation Fog: Advection, Evaporative And Radiation

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Introduction
This paper looks at the different types of fog in the United States, the conditions needed to produce fog, the measures the government takes to reduce fog related accidents and their effectiveness. The purpose of this paper is to bring awareness to people who reside in places with fog as well as continue the conversation on how to better reduce fog related accidents.
Types of Fog Fog is moisture trapped close to the ground when warm air cools and becomes saturated with moisture. The locations and circumstances that created the fog are what differentiate between the types. The five different types of fog that this paper will look at are Radiation, Advection, Freezing, Evaporative and Hail.
Radiation
Radiation Fog is formed as …show more content…

This can occur inland over a lake or river, but it is very much a staple of coastal living. Four of the foggiest places in the United States have advection fog, Point Reyes California, San Francisco California, Cape Disappointment Washington and Mistake Island Maine. For example off of the California coast off shore winds blow warm moisture filled air across the colder Pacific Ocean shoreline and when the moisture condenses it creates fog with a horizontal movement from the wind. Advection fog can form very quickly if the air mass moving in has been preconditioned. In this type of fog anti cyclones play a larger role. They create an inversion or a cap over the surface, which means that as the warm air rises it hits the cap, cools and returns back to the surface condensing all the moisture it carried. Anticyclones also contribute to wind shear, which is when the wind changes with elevation.
Freezing
Freezing Fog is when water droplets condense towards the surface where the temperature supercools the moisture and once the water droplets settle on a surface they freeze. This type of fog is most common up in the mountains where the temperature drops to freezing. This fog is especially dangerous because it can coat the roads in ice, which contributes to dangerous road conditions. This has been seen in Louisville Kentucky and other similar locations. Due to the temperatures needed to create Freezing Fog it is more likely to occur in the Polar Regions.

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