Surely each of us have heard on TV or clobbered speakers Radio phrase, "declared a storm warning."At the head of the majority there is the image: a dense curtain of storm, and then torn by the wind, before the power of the elements bent trees and a couple of hapless passers-by fate was in the street.
But you know what the nature and the laws of this meteorological phenomenon?Let's deal.
Storm (or storm) is called an extremely strong wind (or impressive tempest in the sea).Storm warning announced and when the expected large snowfall.This natural phenomenon may pose a risk to human life and infrastructure of settlements.Particularly affected when storm power lines, construction of glass and light metals, as well as green spaces.
Big trouble is expected when a storm warning is declared in Moscow and other large cities with traffic congestion.Wind and rain destroy the underground rock, because of what can literally fall through the asphalt under the car.Frequent traffic jams after the storms and paralyze traffic on large plots.
American scientists have found that in the northern latitudes should be declared a storm warning in those cases when the wind speed reaches thirty-five miles per hour (or fifty-six kilometers).
With the development of the wind speed of sixty kilometers per hour and a storm gets its own name.
scientists meteorologists identify several reasons of occurrence of the storm:
- cyclone (can be either a tropical or other etiology), passing through the territory;
- tornado, tornado or blood clot;
- local or frontal thunderstorm.
wind speed during storm exceeds twenty meters per second (measured at the surface of the earth).Upon reaching the target of thirty meters per second storm officially goes into the category of "Hurricane."If such an increase in speed is of short duration, the jumps are called squalls.
storm warning is declared when meteorologists predict the wind speed exceeds nine on the Beaufort scale.Also on this scale is classified intensity:
- strong storm (ten points of Beaufort or up to 28.5 m / s);
- storm (eleven points on the Beaufort or up to 32.6 m / s).
Depending on where the storm formation are:
- hurricane (Atlantic region);
- typhoon (Pacific).
most famous storms and their consequences
In 1824, he was completely flooded St. Petersburg.As a result of high winds and sea water Neva and its canals overflowed.The rise of water was recorded at 410 centimeters.It is noteworthy that even the day before the violence of elements deteriorated sharply weather storm warning was announced, but many people ignored the warnings and went for a walk on the waterfront.
In 1931, severe flooding has undergone populous Chinese city of Gaoyou and its surroundings.In the monsoon season came from the banks of the Yellow River.As a result, more than three hundred thousand hectares of land were under water.Without a roof were about forty million Chinese.In some places, according to eyewitnesses, the water was still about six months.