Causes of Strong Convective Weather on Mount Everest

Of course, it is 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 a strong westerly wind, so it becomes a "cloud"

The flag flies high on the summit, which is called "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". On the majestic Mount Everest, generally speaking, the area 5-7 kilometers above sea level is covered with snow and ice. In areas over 7 kilometers, because of the steep wind and steep slope, snowfall is not easy to accumulate, so it is mostly exposed gravel surface. Whenever the sun shines directly after sunrise, the surface properties are uneven and the heating conditions are different. Snow and ice reflect more heat, and the temperature is lower than that of the free atmosphere. However, the gravel surface absorbs heat quickly, and the temperature near the ground is much higher than that in the free atmosphere. When cold air sinks and hot air rises, there will be two local circulations in different directions. From more than 7 kilometers to the peak, it maintained an obvious upward trend. Near the junction of ice and gravel, this part of the ice and snow surface is heated and sublimated, which transports water vapor into the updraft. In this way, there is upward movement. With the source of water vapor, it is easy to form clouds, and the height of Mount Everest is just close to the condensation height of updraft in this area. Therefore, convective cumulus clouds often form at the peak. When the clouds formed, they were blown away by the high-altitude wind, and the distant clouds were blown away, while the nearby ones gathered and stayed because of the continuous formation of clouds. With the difference of high-altitude wind, updraft and weather system, the shape of the flag cloud is constantly changing. Obviously, due to the intense radiation cooling on the gravel surface at night, the mountain wind blowing down the hillside has the upper hand, so it is difficult to form a flag cloud at the top of Mount Everest at night. Generally speaking, the Qiyun of Mount Everest is produced after sunrise, and it is most obvious around noon.