Why are the atmospheric motions in the troposphere and stratosphere different and there are no weather phenomena in the stratosphere?

The reason why the atmospheric motion forms of the troposphere and stratosphere are different and there is no weather phenomenon in the stratosphere: the middle layer is the stratosphere, and the air flow is stable. Tropospheric air convection up and down, and the exchange of cold and heat creates complex weather.

The troposphere contains a large amount of water vapor. When the ground air is heated, it will turn into hot air and rise upward, while the cold air in the upper layer will fall. Due to the rotation of the earth and uneven heating everywhere, the air has to move around, thus forming wind. When water vapor encounters cold in high altitude, it will cause various meteorological changes such as rain, dew, thunder and lightning.

The troposphere

Starts at the surface of the Earth and stretches high into the sky to the tropopause, the starting point of the stratosphere. In high latitudes, surface friction affects airflow, forming a planetary boundary layer with an average thickness of 2 kilometers. The formation of this layer varies mainly depending on the topography, and is also separated from the rest of the troposphere by the countercurrent layer.