Snowstorm

A snowstorm is a phenomenon Météorologique produces by a weather depression winter important. Between the end of the Fall and the beginning of the Spring, such systems are formed in a Masse of air under the point freezing and precipitations fall in the form of snow in significant amount. These systems cover the vast wide ones (known as synoptic scale ). If the snow, pushed by the winds causes powder mill (Canada French) or high snow-plow (France), the visibility will be strongly reduced and one can find conditions of blizzard

Quantities

The flakes of Neige have a density quite lower than that of the water obtained at the time of their cast iron. Indeed, the crystals of ice which form the flakes occupy very little volume of those. The majority of this one is in fact only the air between the branches of the flake. On average, a thickness of a Centimètre of snow which one dissolves will give only a Millimètre thickness of water, that is to say a ratio of 10 per 1. When the air is very cold, the report/ratio will be able to even reach up to 30 per 1.

A snowstorm can thus bury a city under immense snow-drifts but the quantity of fallen water is only very weak compared to a rain of summer. For example, a snowfall which leaves 20 cm of snow on the ground will be equivalent to a rain of 20 mm, that is to say a very ordinary rain. The snowstorms thus occur in a relatively dry environment when one compares it with the torrential rains tropical S which can give several tens, even hundreds of millimetres of rain of 24 hours.

Impacts

The impact of a snowstorm varies according to the place where it occurs. The areas where such phenomena occur regularly, are equipped to surmount them whereas the cities where they seldom occur can be paralyzed by a few centimetres on the ground. For example, the cities like Quebec or Montreal, with the Canada, receive from 200 to 400 cm of snow annually. They have the cumbersome machinery to remove it quickly and the population can what make to avoid the problems. The Weather service of Canada thus sends a warning of abundant snow for these cities only when 15 cm or more are awaited. On the other hand, of the cities like Atlanta (Georgia), Canberra (Australia) or Vancouver will have such a bulletin for tiny quantities.

In general, the impacts will harm the motor vehicle traffic with the total paralysis of transport, of the snowing up of the grounds to the burial. Any not prepared person who will be outside surprised, can have difficulty in find her way, will undergo engelures, will lose her way and even the life if it does not find shelters.

Other indirect impacts:

  • formation of Corniche S of unstable snow in mountain which can cause Avalanche S subsequently;
  • after one fertile winter in storms one will have a thick coat of snow on the ground which will melt in spring. If the cast iron is fast because the temperature is very high, the risk of floods are very great;
  • the snow clearance of the entries and roofs by the inhabitants is a strenuous work. Each year, several people suffer mild heart attacks while shoveling and some die about it;

For example, on March 4th, 1971, it fell more 40 cm of snow on all is Canada and the North-East of the the United States, the whole accompanied by strong winds and Poudrerie. In the only area of Montreal, 17 people died, breakings with wire of transmission electricity deprived of current certain sectors up to 10 days and the winds blowing to 110 km/h pushed snowdrifts to the second floor of the houses. In all, the city makes transport 500  000 voyages of truck of snow .

Art

Several tables have like subject the snowstorms of which the fabric Snowstorm at sea (1842) of the painter Joseph Mallord William Turner.

See too

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