What is the ridge line of subtropical high? To explain in simple words, I am only a sophomore, and I don't know much about meteorological terms.

The main rain belt is often located at a distance of 5 ~ 8 latitudes north of the ridge line of high pressure.

North Pacific high

Summer is generally divided into two large units: the large unit located in the western Pacific is called the western Pacific high, and the large unit located in the eastern Pacific is called the eastern Pacific high. In the westerly belt on the north side of the ridge line of high pressure in the western Pacific, there are frequent cyclones and fronts, which often produce rainy or rainstorm weather. The main rain belt in eastern China is often located at a distance of 5 ~ 8 latitudes north of the ridge line of high pressure. The seasonal variation of the ridge line of high pressure in the western Pacific corresponds to the seasonal displacement of the main rain belt in eastern China. On average, in May, the ridge line of high pressure is located near north latitude 15, and the main rain belt is located in South China. In June, the ridge line crossed 20 north latitude, and the main rain belt was located in the middle and lower reaches of the Yangtze River and Huaihe River basin, which made the Jianghuai area enter the Meiyu period. In mid-July, the ridge line crossed 25 north latitude, and the main rain belt moved to the Yellow River basin, making North China enter the rainy season. At this time, the Jianghuai Basin was controlled by the ridge line of high pressure, and the Meiyu period ended and entered the summer drought period, with hot weather and little rain. On the south side of the ridge line is the easterly belt, where there are often easterly waves and typhoons, which produce a lot of precipitation. So after mid-July, another rain belt appeared in South China. The mutual configuration of the western Pacific high and typhoon determines the moving path of typhoon. When the high pressure is strong and the ridge line is east-west, the typhoon is stable to the west; When the ridge line of high pressure is northwest-southeast, the typhoon is easy to move to the northwest and land in China. If the high pressure weakens and breaks, typhoons usually land or turn north. The intensity, advance, retreat and movement of the western Pacific high are closely related to the weather, drought and flood in eastern China, and it is one of the weather systems that need to be analyzed and studied in the summer half-year weather forecast.