What are the 500 hPa analysis, 700 hPa analysis, and 850 hPa analysis used to observe in weather forecasts?

In weather forecasts, 500 hectopascals, 700 hectopascals and 850 hectopascals are used to observe and analyze atmospheric pressure levels.

1. 500 hPa analysis: In meteorological forecasting, 500 hPa is usually used to observe and predict the movement and development of high-altitude weather systems. This is because in this pressure layer, changes in atmospheric temperature and humidity affect wind speed and direction, which in turn affects the weather. This level is also one of the areas with the largest temperature gradients in the atmosphere, often leading to violent 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 pressure layer is one of the most active layers in the atmosphere. Because it is closer to the ground, its changes can affect weather conditions on the ground more quickly. For example, if an area of ​​high or low pressure develops above 700 hPa, then this may indicate sunny or cloudy weather over the next few days.

3. 850 hPa analysis: The analysis of 850 hPa is also related to surface weather. This pressure layer is usually used to observe and analyze weather systems close to the ground, such as low pressure, high pressure, fronts, etc. In addition, the pressure of 850 hPa is also related to the formation and changes of clouds, so it is an important tool for observing and predicting clouds. For example, if the 850 hPa chart shows an approaching cold front, a cold air storm is likely.

In general, the analysis of these pressure layers is an important tool used by meteorologists to predict weather.