Astronomical experts explained that the heat during the “big heat†period was due to the fact that since the summer, the amount of heat absorbed from the sun during the daytime was more than the heat released during the day, and heat accumulated continuously. During the great heat, the accumulated heat reached its peak. , so the big summer heat is the hottest. In general, during the hot days when the maximum daily temperature is higher than 35°C (called "hot days" in the weather), the number of people with heat stroke is obviously increased. When the maximum daily temperature reaches 37°C or above (in weather conditions, it is called “hot dayâ€), the number of heat stroke increases rapidly, especially in the middle and lower reaches of the Yangtze River under the control of the subtropical high, where the sun is hot and the humidity is small. It is even more boring and hot. The “three hot stoves†along the Yangtze River—Nanjing, Wuhan, and Chongqing—have an average of “hot days†of 17 to 34 days a year, and “hot days†also have 3 to 14 days. In fact, there are still more hot spots than the “three major stovesâ€, such as Anqing, Jiujiang, and Wanxian. Among them, Guixi in Jiangxi, Hengyang in Hunan, and Kaixian in Sichuan have an average annual “hot day†of 40. Over the sky, the entire middle and lower reaches of the Yangtze River is a large “fire stove.†Therefore, it is especially important to do a good job of preventing heatstroke and cooling.
In ancient China, the Great Heat was divided into three waiting periods: “A rot is a firefly at the end of the day; the second is a nightmare; the third is a rainy day.†There are more than 2,000 kinds of fireflies in the world, both aquatic and terrestrial, terrestrial. Fireflies lay eggs on the subtilised grass. When the great heats occur, the fireflies hatch out. Therefore, the ancients believed that the fireflies were turned into rotted grass; the second time was that the weather began to become hot and the land was very wet; the third time was that there were often Large thunderstorms will appear. This heavy rain will weaken Shushi and the weather will begin to transition to the beginning of autumn.
In general, solar heat is the most frequent and highest temperature period in southern China. It is the most abundant rainfall in western South China, the most common thunderstorm, and the highest concentration of hot days above 30°C. It is also the most frequent occurrence of high temperatures above 35°C in the eastern part of South China. Period of time. The summer heat is also the season with the highest number of thunderstorms. There are proverbs saying: “Without a single drop of the East Flash, the West Flashes out of the sky†means that if the lightning strikes in the East in the summer afternoon, the rain will not come here. If the lightning is in the West, then the rain It will come soon, and it will be too late to escape. People often refer to thunderstorms in the summer afternoon as the “northwest rain†and describe “northwest rain, falling through the road without cars.†“Summer rainstorms across the fields†and “Summer rain across the back of a cowâ€, etc., figured out thunderstorms. It is often sunny on the side that is raining. As the poet Liu Yuxi of the Tang Dynasty wrote, "The east side is sunny and the west is rain. The road is clear and sunny."
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