Sunset and weather

The working people in our country have always attached importance to the relationship between sunset glow and weather, and summarized a lot of experience in predicting sunny and rainy days in the future with sunset glow. For example, Xu Guangqi wrote in "The Complete Book of Agricultural Administration": "As the saying goes, from dawn to dusk, there is no water to make tea, and drought is the main cause. This statement is also sunny. " As the saying goes, "Don't go out at sunrise, but go to Wan Li Road at sunset. This all means that it will be fine after the rain. " A long time ago, there was strong air convection under the sun, and there was more dust in the atmosphere. At this time, a glow appears, and the red light appears pure, indicating a sunny day. The rainy weather in most parts of China mainly comes from two directions. First, influenced by the westerlies, the systematic weather process moves from west to east. If there is morning glow in the east and thick clouds in the west, there will be systematic precipitation. The other is the convective precipitation process. With the strengthening of sunshine, air convection is enhanced, so it often moves with the sun, forming local rainfall around noon. If it is sunny after the rain, the morning glow appears in the east, indicating that the humidity in the atmosphere is relatively high. This is a sign of rain. The appearance of sunset glow generally indicates that there is no large-scale cloud in the western sky, which is a sign of systematic weather crossing the border. Moreover, due to the weakening of thermal convection at night, it is difficult to form rainfall. Therefore, there is a proverb "Don't go out at dawn, travel thousands of miles at sunset".

However, the relationship between smog and weather is extremely complicated. For example, there is a sunset glow on a sunny day after the rain, and the coastal areas are affected by typhoons. When the weather system moves from the east, rain will still form despite the sunset glow. It is impossible to fully understand the weather changes based on sunlight alone. If we can combine other meteorological elements for comprehensive analysis and accumulate a large amount of data, it will also help to forecast the weather more accurately.