Why is weather so changeable?

Why is weather so changeable? Once on the bus heard: "On Sunday morning it was sunny and warm, but we stayed home. During the day the sky was covered with clouds, and we almost had a quarrel. She was about to leave, but then it began to rain. She had to be delayed, and instead of confusion and misunderstanding was frank and unforgettable sex ".

 Weather makes adjustments in our lives, and sometimes significant. The weather changes our plans, mood, feeling, often has an impact on our health. Very bad weather may cause natural disasters, destroying buildings, killing animals and people.

 We are with his technical progress can not change the weather for our taste. Existing methods for active influence on the weather, local, environmentally unsafe and inefficient. She - the weather - constantly changing and continuously. Change over time. Yesterday morning the rain fell, it was windy and cold, and after dinner, cleared, and the faint breeze. All day rain. And what will happen tomorrow?

 Significant changes in weather occur during the seasons, but these changes are expected, though a sudden. Do not be an expert to say that in mid-latitudes in the summer will be warm in the winter cold and snow. But what days the snow falls this year? And the next? These questions and meteorologist will not answer.

 The weather is changing and in space. In some parts of the globe sun shines bright in others there is torrential rain, in the third - Strong winds tear roof and uprooting trees, and somewhere else, everything is shrouded in mist. Why is this happening?

 The culprit is climate variability of the weather, it is its condition and determine the weather at this time outside. The atmosphere is constantly changing, there are air currents and destroyed the diverse nature and scale. The main reasons for these changes is the differential heating and cooling the Earth's surface and air at different latitudes and over land and sea, which is complicated by the influence of Earth's rotation.

As a consequence, in the middle latitudes dominated by transport of air masses from west to east, which is disturbed by atmospheric vortices - cyclones and anticyclones. Their origin is associated with the interaction of cold and warm air masses. When two different air masses are formed band called fronts. Typically, the active fronts associated with cyclones. Cyclone is an area of low atmospheric pressure. For the cyclone is characterized by cloudy weather with precipitation.

 Anticyclones, or region of high atmospheric pressure, typically characterized by stable weather with light winds and overcast skies. In summer, daytime absence of clouds helps to ensure a huge amount of solar heat the earth's surface. There is a sunny, very hot and dry weather. At night, in an anticyclone at the clear sky the heat emitted by the Earth's surface evaporates into space. As a result, the soil quickly cooled. In the cold season is cooling leads to strong frosts.
 These are the main causes of variation in weather only in general terms. In the atmosphere, the number and diversity of factors influencing it, is so large that even with modern methods of measurement, the availability of precision instruments and super-computers the accuracy of weather forecasts often leaves much to be desired.