12 August

Where begins the weather ?

What is the weather, everyone knows.This rain, which prevents a picnic, the sun, which is decorated or spoil the weekend, snow, which violates the traffic movement, and the wind, which confuses the hair and puts a grain of sand in the eye.For most of us it's the weather that can affect the practical aspects of our lives.But the weather has many faces, which we never thought of.

weather and climate is certainly not the same thing.As was noted, the climate - that's what you expect, weather - this is what you get.The weather can be defined as a daily and sometimes hourly changes in atmospheric conditions.Climate - is the mean value of these parameters for a certain period.As one scientist ... climate reduces or increases the range of diseases, and the weather determines the duration and severity ... Therefore, if we talk about diseases, the climate provides the reason and the weather - the possibility.

Weather composed of several factors.This atmospheric parameters, namely, temperature, wind speed, humid

ity and rainfall, as well as geographical factors, such as altitude, latitude, time of day and time of year.

Most scientists agree that for us the weather starts with the atmosphere - this air cushion, stretching above the earth's surface from the sea level up to 100 kilometers.Human life is at the bottom of the ocean air, which is rich in a mixture of gases, including nitrogen (78%), oxygen (20%) and argon (less than 1%), and minor amounts of neon, helium, krypton, hydrogen, xenon,ozone and radon.

Although we did not see, but in the atmosphere is constantly movement: warm air rises and cold falls downwards.It occurs throughout the world and on a global scale, spanning continents and oceans, and a smaller, covering cities and towns.Areas of updrafts of warm air downward and cold air streams are called the regions of low and high pressure.

To understand the difference between the areas of high and low pressure, imagine that the air is sucked under a huge straw hat.When warm air rises into the upper atmosphere, it formed a kind of a vacuum near the Earth's surface.This area of ​​low pressure.Similarly, when the colder and denser air will start to fall down and accumulate there, a region of high pressure.

In the upper layers of the atmosphere the air is moving quickly - in the 10-12 km from land the jet stream can reach speeds of 320 km / h.Closer to the Earth's surface air velocity slows due to friction with the Earth.Air also has a tendency to move from high pressure to low pressure area.But because Earth is constantly rotating, the huge air masses that rise and descend from the equator to the poles, deflected to the side.This is called the Coriolis effect.All of these air movements create what we call wind.

Due to the effect of the Coriolis air mass in the Northern Hemisphere generally move from west to east (in the South - from east to west).However, not all of the huge mass of warm air rising from the equator passes this way.Part of the air goes into the north and south poles and reaches.When the cold air from the poles going again and lowered it again moves to the equator, and everything is repeated.