How to judge the main meteorological disasters from the distribution of sea level isobar

The main elements in the sea level isobar map are wind field, pressure field, temperature dew point distribution, weather phenomenon distribution and so on.

The analysis of wind field mainly looks at strong wind area and wind shear area. Generally speaking, the area with wind shear will be the area where the frontal system exists. The analysis of pressure field mainly depends on whether the large value area is controlled by the high pressure center or the low pressure center, where the area to be predicted is in the system, what kind of airflow is affected, and the future movement of the system; Temperature dew point difference is one of the important factors to be considered in precipitation forecast, which has a good guiding role for water vapor. The precipitation can be predicted by combining water vapor transportation with the intersection of cold and warm air. The temperature forecast mainly combines the previous minimum temperature and maximum temperature, analyzes advection term (that is, whether the temperature pressure field is cold advection or warm advection) and radiation term (analyzes the change of cloud cover, and the minimum temperature rises when it is cloudy at night, and the maximum temperature rises when it is partially cloudy during the day, and vice versa), and comprehensively obtains the future temperature changes.

Take a weather map of Asia and Europe as an example: distribution of high and low pressure systems, distribution of frontal systems, water vapor transport (with or without southerly airflow or easterly airflow), weather situation, etc. Future weather changes or meteorological disasters need to be further judged in combination with the trend distribution of high-altitude maps.