What does the meteorological 200mb flow field mean?

Cyclone refers to a large vortex in which the horizontal airflow in the northern (southern) hemisphere rotates counterclockwise (clockwise). At the same height, the air pressure in the center of the cyclone is lower than that around it, which is also called low pressure. It appears as a low-pressure area surrounded by closed isobars on the contour map, and a low-value area surrounded by closed isobars on the contour map. Cyclones are similar to circles or ellipses, and their sizes vary greatly. Small cyclones have a horizontal scale of several hundred kilometers, and the large ones can reach three or four thousand kilometers, which belongs to the weather scale weather system. In cyclones, the weather often changes dramatically, which is the weather system that people are most concerned about and studied at the earliest. Cyclone refers to the large vortex in which the horizontal airflow rotates counterclockwise (clockwise) in the northern (southern) hemisphere atmosphere. At the same height, the air pressure in the center of the cyclone is lower than that around it, which is also called low pressure. It appears as a low-pressure area surrounded by closed isobars on the contour map, and a low-value area surrounded by closed isobars on the contour map. Cyclones are similar to circles or ellipses, and their sizes vary greatly. Small cyclones have a horizontal scale of several hundred kilometers, and the large ones can reach three or four thousand kilometers, which belongs to the weather scale weather system. In cyclones, the weather often changes dramatically, which is the weather system that people are most concerned about and studied at the earliest.