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WHY by thunder is heard the sound of thunder

Why I hear the sound of thunder during a thunderstorm

Thunderstorms - bright and dazzling atmosphericphenomenon. In temperate latitudes, they occur 10-15 times a year, in the immediate vicinity of the equator, on the ground - from 80 to 160 days a year there are storm.

Over the oceans, they occur much less frequently.

Thunderstorms are the companions of atmospheric fronts in which the displacement of warm air masses cool.

It begins storm with huge column of air,which forms rapidly swellable high white cloud. Storm clouds - the real giants, their value can reach up to 10 km. The lower part of it - is flat, but it is dramatically up and distributed over the sides.

When the upper limit of the cloud-giantreaches the stratosphere, it starts to collapse and take the form of a kind of the anvil. It begins suddenly a hurricane, sometimes turning into a flurry. Storm gusts can cause serious damage. There were times when they overturned rail cars weighing more than 16 tons. The most terrible thunderstorm with squalls occur usually during the warmer months.

Lightning is a powerful electricalair discharge arising between two storm clouds or between a cloud and the ground. The strength of such a charge is enormous, so the air around the lightning instantly heats up to a very high temperature and is expanding rapidly. As a result of this expansion, a strong sound waves called thunder.

Multiple and powerful lightning discharges mayform a long rumble and noise. This is because the sound waves reflected from the clouds, the surface of the land, buildings and other objects, creating multiple echoes and extending thunder.

Lightning spread into the air fromthe speed of light, so it is visible almost immediately after discharge, and the roar of the expanding air masses flies one kilometer on average for 3 seconds. If lightning and thunder followed one another without interruption, we can say that the storm comes near. If the lightning flash far ahead of the thunder, the storm is at a certain distance from the observer. Accordingly, the next storm, the longer it can not hear thunder after lightning.

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