Fog: its essence and reasons

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Fog is a mixture of condensate products. A lot of small drops of water hovering directly above the earth’s surface make fog to appear.

Some facts about Fog

Negative side:

Compared to other meteorological phenomena, such as a tornado, thunderstorm, snowfall, fogs, in fact, are not considered a fearsome power of nature. Nevertheless, it strongly influences the human’s life and health in general and several production processes. Moreover, all means of transportation are in a great danger because of fog presence.

When it is foggy, the visibility deteriorates, therefore, for security purposes, the movement of water transport and planes is limited, and various building works outside are stopped. Besides, a possibility of transport disasters is high enough, for example, it was in 1989 when the fog in Milan caused a serious accident – about 80 cars ran into and caught fire.

However, this natural phenomenon can have a real benefit for agriculture – in arid areas, they provide the soil with additional moisture, which increases yields.

What does fog consist of?

It is clear that the main constituent of fog is water. When the temperatures are quite different, the amount of water vapour in the air may be diverse – the warmer, the more. If the temperature drops, some of the moisture condenses.

Formation principles

Fog is formed due to the contact of cold air with warm air at a relative humidity of more than 85%. However, in inhabited localities it occurs even with low humidity. Thus, the water vapour during the combustion of fuel condenses.

Where are fogs found?

To determine this is quite simple – an interflow of air masses and different temperatures and humidity causes the fog itself. There are distinguished the frontier areas: land – sea, warm – cold streams, the border of sea ice, the border of snow cover. Such conditions are meet mostly in the North, the areas of which are even called the “poles of fogs”.

 So, at the junction of the warm Gulf Stream and the cold Labrador Current in the Newfoundland area, there are 120 days with fogs per year, especially in summer. On average, there are 22 foggy days per month. On this purpose, this area is considered one of the most dangerous for mariners.

The fogs often visit the Kola Peninsula (50-100 foggy days per year), they are less often on the coasts of the Barents Sea, the North Sea and the Baltic Sea, in the Sea of Okhotsk and the Sea of Japan, they are characteristic of Florida and California.

Quite a different phenomenon is the “urban” fog. Under unfavourable conditions and polluted air, fog in the living districts can easily arise and persist for several days. The best samples are London and Saint Petersburg.


Seasonality of fogs

Fog can be at any time of year. This is not uncommon in the lowlands, above the reservoirs, in the mountains. In the autumn-winter period, fog occurs most often. The air temperature tends to change abruptly. Therefore, the flow of warm and cold air actively move above the ground. The duration of fogs in the time interval can vary from 20-40 minutes to days and even more.

Tags: Fog, water, mist, haze, clouds, drops, humidity, moisture, charming, beautiful, nature, temperature, weather, earth, safety, sea, streams, London, California

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