What are the formation factors of hail?

Hail is formed in cumulonimbus clouds formed by convective clouds. Water vapor rises with the airflow and condenses into small water droplets after cooling. If the temperature continues to decrease with the increase of height and reaches below zero degrees Celsius, water droplets will condense into ice particles. In the process of its upward movement, it will absorb small ice particles or water droplets around it and increase it until it decreases due to the increase of weight.

When it falls to a higher temperature zone, its surface will melt into water; At the same time, it will also absorb small water droplets around it. At this time, if it is lifted by a strong updraft, it will condense into ice particles and continue to condense and grow until it falls due to its own weight. If it doesn't melt into water when it falls to the ground, it will still be solid ice particles or hail.

In summer, the weather is hot and the sun is scorching the earth, which is easy to produce a lot of hot and humid air near the ground. Water vapor in the air rises with the airflow. The higher the height, the lower the temperature, and the water vapor will condense into liquid water droplets. If the height continues to increase and the temperature drops below zero degrees Celsius, water droplets will condense into solid ice particles.

Under the repeated upward and downward adsorption and condensation, the ice particles will become bigger and bigger. When the ice particles grow big and heavy enough and there is not enough updraft to push them up, they will fall to the ground. If the ice particles are still solid when they reach the ground, it is hail seen in summer.