Question

Why do weather conditions prevail in the troposphere?

Answer 1

The general principle of the troposphere is that temperature decreases with height, which makes the troposphere unstable enough for the air to rise and cause certain weather conditions. When cold air is found above warm air, the latter is bouyant enough to rise. The atmosphere is partially transparent to the sunlight, hence all the energy passes through the air and heats the ground. The ground acts as a heating plate at the bottom of the atmosphere; so, the higher you get (away from the ground) the cooler the ground gets. 

Answer 2

Troposphere is the lowermost level of the earth's atmosphere. It is 70-80% of the total mass of earth's atmosphere which contains all major weather phenomenon , systems , turbulence and clouds. Almost all of the atmospheric water vapors are included in this area. Air temperature increases with the height. The lapse rate also varies that includes inversions. Temperature falls below -50°C in the lower troposphere. These variations show that most of the weather conditions prevail in troposphere.