The world has 14 peaks above 8000 meters above sea level, of which 10 are located in the Himalayas and Mount Everest (8,848 meters) is the highest in the world.

Looking at Mount Everest is indeed magical and beautiful. Whether it is the mountain peaks in the clouds or the dazzling snow and ice world, it is of great interest. However, people are most interested in the clouds floating on the peak. This cloud seems to be a flag flying above the peak, so this cloud is vividly called a flag cloud or flag cloud.

The shape of the Everest qiyun cloudless, sometimes like a banner waving in the wind; sometimes like waves crashing into the waves; suddenly become the smoke of rising graceful; just like a galloping horse; a veil again like a gently waving. All this has made Mount Everest more beautiful and spectacular scenery. It is a natural wonder of the world.

What caused the formation of the Qi Yun of Everest? On the northern slopes of the Mt. Everest and 7,500 meters below the southwest slope are covered with snow and ice. Due to the high winds above 7,500 meters, the slopes are steep and snowfall is not easy to accumulate. Therefore, the underlying surface is mostly a gravel surface. Mount Everest has high altitude and strong solar radiation. Whenever the sun shines directly after the sunrise, the heat conditions in different parts of the country are uneven. Near the gravel surface, the ground absorbs heat quickly, and the surface air temperature is higher than the free air temperature of the same altitude, forming an upward airflow along the slope; below 7,500 meters, the surface of the ice and snow is heated and sublimated by the sun, and the water vapor is sent to the updraft, providing the cloud to Chengyun. The favorable conditions. In addition, on the surface of ice and snow, the amount of reflected heat is higher, and the surface temperature is lower than the temperature of the free atmosphere. As the cold air sinks and the hot air rises, local circulations with different directions are generated. Convective cumulus clouds often form near the top of the peak. Therefore, a flag-like cloud is often observed at the top of the mountain during the day. With the rise of air above the sky and the weather system, the appearance of the Cowin also continues to change.

In the evening, the radiative cooling of the gravel surface caused it to cool at a temperature lower than the free air temperature at the same height. The air moved downwards, that is, the mountain breeze was blowing. Therefore, it was difficult to find a cloud at the top of Mount Everest at night. After 3 or 4 o'clock in the afternoon, due to the strong convection and the rapid development of cumulus clouds, the top of the hill was often covered by clouds, and there was no sign cloud.

The climbers of experienced meteorologists often deduce the size of the wind at the top of the peak based on the location and altitude of the Everest Cowin. If the position of the cognac flutters upwards, it means that the smaller the sky is, the more it will descend downwards, the greater the wind power; if it is level with the top of the peak, the wind will be about nine levels. Another example is that before India's low-pressure transit, the direction of the Cowin moves from the southeast side of the peak to the northwest, reflecting that the high altitude has changed southeast winds, and the low-pressure system is approaching, followed by low-pressure transit, often accompanied by snowfall.

Since the change of the Cowin can reflect the change of high air flow, the Everest Cowin also has the title of “the highest wind vane in the world”.

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