What is convective weather?

The so-called strong convective weather refers to weather phenomena such as strong winds, short-term heavy precipitation and hail during thunderstorms.

The horizontal scale of severe convective weather is generally within 200 kilometers, and some are only a few kilometers. But this kind of weather is very destructive, and we usually list it as the fourth destructive gas after tropical cyclones, earthquakes and floods.

Because strong convection is a weather phenomenon caused by strong vertical movement of air, it occurs mostly in summer, especially in the afternoon to evening.

Because in summer and during the day, the ground can continuously absorb the short-wave radiation of the sun, the temperature rises, and at the same time it emits long-wave radiation to heat the atmosphere. When the air near the ground receives enough heat from the earth's surface, it will expand and reduce its density, and then the atmosphere will be in an unstable state.

It's like oil and water in a water tank. When the oil with low density is at the bottom of the water tank and the water is at the top of the water tank, there will be a strong upward movement, and finally the oil will float to the water surface.

Similarly, when the hot air near the ground rises under the buoyancy, it forms a rising hot and humid airflow. When it rises to a certain height and the temperature drops, the water vapor contained in the air will condense into water droplets. When these water droplets fall, they will be lifted by the stronger updraft, and so on, and the small water droplets will gradually gather into large water droplets until the high-altitude airflow can no longer support its weight, and finally fall into rain.