What is the weather phenomenon at the top of Mount Everest?

The weather phenomenon at the top of Mount Everest is called "Yun Qi".

Clouds floated to one side along the top of the mountain, like a flag fluttering in the wind. The shape of the flag cloud will also change, sometimes like a raging wave, sometimes like a galloping horse on an ancient battlefield. Occasionally, you can see plateau eagles flying over the flag clouds, embellishing the infinite scenery of dangerous peaks.

When the weather is clear, ivory clouds like flags often float on the top of Mount Everest, which is the flag cloud of Mount Everest. Yun Qi is formed by convective cumulus clouds, and the peak wind force can be inferred from its floating position and height. If the floating position of the flag cloud rises upward, it means that the wind power at high altitude is small, the wind direction is inclined downward and the wind power is strong; If it is flush with the summit, the wind is about nine. Therefore, Mount Everest Yun Qi is also called "the highest weather vane in the world".

Yun Qi can be used not only as a weather vane, but also to forecast the weather according to the change of wind direction. Under normal circumstances, there is a strong westerly wind blowing over the plateau, and the direction of the flag cloud will point to the east; If the flag cloud points to the north, it means that it will snow soon; The flag clouds rising like smoke also indicate that the weather will get worse.

The flag cloud of Mount Everest is of course caused by its special landform. Scientists have found that the surface of Mount Everest below the plateau at an altitude of 7000 meters is covered with ice and snow. From more than 7000 meters to the top of the mountain, there are gravel slopes. After the sun came out, the gravel slope was heated quickly, and the hot air rose along the slope and began to condense into clouds near the height of the summit. When the cloud is higher than the peak, it is immediately blown to the east by the strong west wind, so a "cloud flag" flies high at the peak.