Hangzhou issued a yellow warning for strong winds, and some places had hail. How is this strong convective weather formed?

Due to weather changes and strong convective weather, Hangzhou is the first provincial capital city to reach 3 1℃ in one day. When the ground is heated strongly, the air on the ground will expand and rise, forming an updraft. Just like cooking, the temperature in the pot is very high, and the air above the pot will flow upward, which is the updraft. When the temperature rises to a certain extent, the temperature will also change with the change of altitude. In the troposphere, the temperature will drop by about 6℃ for every rise of1000m. When it rises to a certain height, water vapor condenses into clouds due to changes in temperature and pressure.

The occurrence of strong convective weather is related to strong updraft and sufficient water vapor conditions, and has nothing to do with the cold in late spring. The cold in late spring is based on the high temperature in early spring, which is prone to strong convective weather. Strong updraft will make the cloud height reach about 10000 meters. The temperature will become very low, even lower than 0℃. Low temperature will make small water droplets form ice particles. In the process of falling, these ice particles will encounter supercooled water, and they will attach to the surface of ice particles, leading to hail growth.

The strong updraft will make the ice particles rise again, so they will rise, sink and rise again. These ice particles will not fall until the updraft can no longer hold them up. That's it? Hail? . There is a negative correlation between the size and quantity of hail. The larger the scale, the less the quantity, but the larger the scale, the greater the negative impact. Hail is produced in strong cumulonimbus clouds. This kind of cloud, also called hail cloud, will only be produced when the atmospheric conditions are unstable.

In spring, the weather gets warmer and the sun scorches the earth. It is easy to form unstable hot and humid air near the ground. When there is weak cold air at high altitude, is the top cold and the bottom warm? It is easy to cause strong convection in the air, and the hot and humid air rises rapidly, which creates good conditions for the formation of hail. In winter, the temperature near the ground is very low, which can not produce strong and rapid updraft, and it is difficult to form hail in winter. Cold air and warm and humid air flow intersect. Hangzhou enters the continuous rainfall mode, and the temperature will drop sharply.