Humans can't predict the future, so how does the weather forecast know the weather changes in advance?

Speaking of "forecasting the weather", the most famous bridge may be Zhuge Liang's borrowing from the East Wind in the Chibi War in The Romance of the Three Kingdoms. At that time, Sun Liu's allied forces were located on the south bank of the Yangtze River, and Cao Cao's troops were located on the north bank of the Yangtze River. If you want to attack from south to north, you need to blow southeast wind. It was winter at that time, and the eastern part of our country belonged to monsoon climate. The northwest monsoon prevails in winter. Where is the southeast wind? At this time, the meteorologist "Zhuge Liang" appeared in the Three Kingdoms period. He came to the stage to predict that there would be a southeast wind on 1 1 October 20, and sure enough, the southeast wind started that day, and then a wonderful Chibi war was held.

Zhuge Liang borrowed from the east wind, although it is the bridge of the novel, but we can also regard it as a kind of "weather forecast" or "weather forecast" Humans have been making weather forecasts since ancient times. Although the weather is a short-term weather phenomenon, which changes very quickly and is difficult to predict, the weather change is included in the local climate change, and the climate situation in a region is relatively stable and changes regularly. For example, the eastern part of China has a monsoon climate, and the Yangtze River basin has a subtropical monsoon climate. The climate is characterized by "high temperature and rain in summer, low temperature and little rain in winter, and the same period of rain and heat", which includes the changes of gas temperature and precipitation in a year.

In addition, there will be "Meiyu" weather in the Yangtze River basin from mid-June to mid-July every year, which lasts for about one month. July and August are likely to be controlled by the subtropical high belt, forming a "summer drought" weather with high temperature and little rain. After 10, the weather turns cold, and "cold front" weather often occurs. All these weather changes are periodic changes year after year, so the corresponding weather can be predicted at the corresponding time every year. Using the climate data of a certain area for many years to predict the weather should be what human beings have been doing. Many experienced farmers are very accurate in forecasting the weather, mainly because they are familiar with the local climate change, and they will also sum up many proverbs.