5 sitations of lower pressure
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We often hear the terms high pressure and low pressure in weather reports. Low pressure means that the atmospheric pressure of a region is lower than the surrounding area; when the situation is reversed, it is called high pressure. Therefore, the designation of high and low pressure is only relative like the designation of peaks and valleys in mountainous areas.
Every day meteorologists collect barometric pressure readings measured simultaneously at weather stations all over the world, and then update them on a map with the location of the weather stations marked on it. They then will connect by pencil the weather stations that have the same pressure readings thereby drawing an isobaric line. The chart formed by these isobaric lines is called the synoptic chart (or a weather map). By studying the distribution of the isobaric lines on the chart we can clearly see the location and distribution of the high and low pressure systems on the surface of the Earth.
Usually, low pressure occurs in mid-latitude temperate zones. It is formed by the movement caused by the colliding surface (i.e. front) of two characteristically different warm and cold air masses when they meet. The development of a low pressure system can be divided into four stages: early, mature, decay, and dissipation (Fig. 5). The average life span of a low pressure system is about seven days.
★★–––––Here is your answer ––––––★★
We often hear the terms high pressure and low pressure in weather reports. Low pressure means that the atmospheric pressure of a region is lower than the surrounding area; when the situation is reversed, it is called high pressure. Therefore, the designation of high and low pressure is only relative like the designation of peaks and valleys in mountainous areas.
Every day meteorologists collect barometric pressure readings measured simultaneously at weather stations all over the world, and then update them on a map with the location of the weather stations marked on it. They then will connect by pencil the weather stations that have the same pressure readings thereby drawing an isobaric line. The chart formed by these isobaric lines is called the synoptic chart (or a weather map). By studying the distribution of the isobaric lines on the chart we can clearly see the location and distribution of the high and low pressure systems on the surface of the Earth.
Usually, low pressure occurs in mid-latitude temperate zones. It is formed by the movement caused by the colliding surface (i.e. front) of two characteristically different warm and cold air masses when they meet. The development of a low pressure system can be divided into four stages: early, mature, decay, and dissipation (Fig. 5). The average life span of a low pressure system is about seven days.
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