Xiamen stages city in the sky, rare celestial phenomenon warms night lampposts

Xiamen staged a rare celestial phenomenon, a warm night lamppost, in the sky city. Yesterday (10th) night, a rare celestial phenomenon, a warm night lamppost, appeared over Xiamen. According to the analysis of meteorological analyst Hu Xiao, Xiamen experienced rainfall yesterday afternoon. When the rain stops around the evening, the air humidity is relatively high, and the wind at high altitude is small. Therefore, the ice crystal cirrus clouds form a mirror-like state, thus reflecting the light on the ground into the night, forming a rare warm night lamppost. Phenomenon. What is a night-warming lamppost? Warm night lampposts are one of the wonders of lampposts. Before last night, many people must have only heard or seen cold night lampposts. The so-called cold night lamppost refers to the special ice crystals in the sky at low temperatures, which reflect the light on the ground into the sky to form a wonderful scene. The colorful light beam, like a sharp sword, shot straight into the sky from the ground, which was very shocking. Because this spectacle often occurs on winter nights in cold areas, it is called a cold night lamppost. However, the warm night lampposts that appeared on the night of the 10th occurred in warm Xiamen. Monitoring showed that from 20:00 to 21:00 yesterday, the temperature in Xiamen was generally around 23°C, while the cold night lampposts usually had temperatures below minus 20 degrees Celsius. ℃, the temperature difference between the two is more than 40 ℃. According to Hu Xiao's analysis, the warmth and coldness of the temperature are not the decisive factors in the formation of the lamppost spectacle. What really plays a decisive role is the wind and the state of atmospheric clouds. Last night, the air humidity in Xiamen, which had just rained, was relatively high. The influence of low clouds on the ground ended, leaving only ice crystal-like high clouds in the sky. In addition, the wind at high altitude was light. Therefore, under the calm weather, the ice crystals in the clouds were neat. Arranged uniformly and horizontally, they are like mirrors, reflecting the lights on the ground into the night. The appearance of lamp posts in the cold night is because when the weather is calm, all ice crystals are suspended in the air, and the entire atmosphere becomes a curtain for the lights on the ground, so the scene of upright lamp posts appears. , there is still a certain difference between the two. The warm night lampposts in Xiamen this time can be described in five words: rare and rare. They are the best in your lifetime. Because compared to cold night lampposts, warm night lampposts have more stringent requirements for meteorological conditions. They must not be affected by low and medium clouds, only high clouds exist; they must also have high air humidity, good atmospheric permeability, and high altitude. The wind is light and the presence of ice crystals is indispensable, so this spectacle is really extremely rare.