The weather is frequently changing state of the atmosphere, both a certain period of time and space within the state of the atmosphere, but also the state of the atmosphere within a certain time interval of continuous change. It can be understood as weather phenomena and weather processes collectively. Weather phenomena occur in the atmosphere means the occurrence of various natural phenomena, a transient atmospheric meteorological factors (such as temperature, pressure, humidity, wind, clouds, fog, rain, snow, frost, thunder, hail, etc.) spatial distribution and overall performance. Weather process is necessarily regional weather phenomena change over time.
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The weather is the state of the atmosphere (such as cold, wind and rain, wet and dry, confront, etc.) in a certain region of the short period and its changes in the general term. Weather systems are usually caused by weather changes and distribution of high pressure, low pressure and high pressure ridge, trough, etc. with the typical features of atmospheric motion systems. Various weather systems have a certain spatial scale and time scale, and a variety of scales between systems are intertwined and interact. A combination of weather systems, constitute a large-scale weather situation constitutes a hemispheric or even global atmospheric circulation. Weather weather system is always in a constant state newborn, development and demise of the process of distribution of its corresponding weather phenomena in the different stages of development. Thus an area of ??weather and weather changes associated with the weather system and its stage of development is the combined result of the dynamic processes of the atmosphere and thermal processes.
All types of weather systems are formed in the atmospheric circulation and geographical environment, development and evolution, reflect the environmental characteristics of a certain region. Such as polar regions and their surrounding throughout the year covered with snow and ice, the air cold and dry, this unique geographical environment of the polar regions low-altitude cold high pressure and high-altitude polar vortex, the trough formation and development of background conditions. The equator and low latitudes year-round hot, humid, the atmosphere is unstable, convective weather systems to produce the necessary condition for development. Middle and high latitudes is cold and warm air is often cross-sui zone, not only warm and cold air masses you come to the turn of frequent, and the baroclinic instability, fronts, cyclones formed, the development of an important foundation. The formation and activities of the weather system, in turn, will give the structure of geographical environment and the evolution of a profound impact. Thus understanding and mastery of the weather system formation, structure, movement variation and the same geographical environment, the relationship between the understanding of weather, climate formation, characteristics, changes and evolution of the forecast geographical environment are very important.