When will it hail?
The weather is hot in summer, and the sun is scorching the earth, which is easy to produce a lot of hot and humid air near the ground. Hot and humid air rises rapidly and the temperature drops sharply, sometimes even as low as -30℃. The water vapor in the hot air condenses into water droplets and quickly freezes to form small ice beads. Small ice beads roll up and down in the clouds, constantly adhering and condensing the surrounding water droplets into ice, getting heavier and heavier, and finally falling from the sky. This is hail.
It can be seen that hail can only be produced when the hot and humid airflow rises strongly. It is estimated that its airflow must rise faster than 20 meters per second. Therefore, hail usually occurs in summer. In winter, the temperature near the ground is very low, so it is impossible to produce strong and rapid updraft, so it is impossible to form hail. Hail is very harmful. It destroys crops and houses.
Hail (English: Hail) is a kind of solid precipitation, which is a round or conical ice block and consists of two layers: transparent and opaque. Its diameter is generally 5 ~ 50 mm, and the larger one can reach more than 10 cm.
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 the small ice particles or water droplets around it and increase it until it drops due to the increase of weight. When it drops 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.