What are 500 HPA analysis, 700 HPA analysis and 850 HPA analysis used to observe in weather forecast?

In the weather forecast, 500 hPa, 700 hPa and 850 hPa are used to observe and analyze the atmospheric pressure layer.

1.500 hectopascal analysis: In meteorological forecast, 500 hectopascals are usually used to observe and predict the movement and development of the upper-air weather system. This is because in this barometric layer, the changes of atmospheric temperature and humidity will affect the wind speed and direction, and then affect the weather. This layer is also one of the regions with the largest temperature gradient in the atmosphere, which often leads to severe weather phenomena such as thunderstorms, hail and tornadoes.

2.700 HPA analysis: 700 HPA is usually used to observe and analyze low-altitude weather systems. This barometric layer is one of the most active layers in the atmosphere. Because it is close to the ground, its change can affect the weather conditions on the ground more quickly. For example, if a high pressure area or a low pressure area appears on a map of 700 hectopascals, it may indicate that it will be sunny or cloudy in the next few days.

Analysis of 3.850 hectopascals: The analysis of 850 hectopascals is also related to the ground weather. This barometric layer is usually used to observe and analyze weather systems close to the ground, such as low pressure, high pressure and fronts. In addition, the pressure of 850 hectopascals is also related to the formation and change of clouds, so it is an important tool for observing and forecasting clouds. For example, if there is a cold front approaching on the 850 HPA map, there may be a cold air storm.

Generally speaking, the analysis of these atmospheres is an important tool for meteorologists to predict the weather.