What is strong convective weather? What is strong convective weather?

Severe convective weather refers to the disastrous weather such as short-term heavy precipitation, thunderstorm and gale, tornado, hail and squall in convective cloud system or single convective cloud block, which belongs to small and medium-sized weather system in meteorology. Worldwide, it is listed as the fourth most disastrous weather after tropical cyclones, earthquakes and floods.

Strong convective weather occurs in small and medium-scale weather systems, and the spatial scale is small. Generally, the horizontal range is about ten kilometers to two or three hundred kilometers, and some horizontal ranges are only tens of meters to ten kilometers. Its life history is short and obviously sudden, about one hour to more than ten hours, and the shorter one is only a few minutes to an hour.

Severe convective weather refers to the disastrous weather such as short-term heavy precipitation, thunderstorm and gale, tornado, hail and squall in convective cloud system or single convective cloud block, which belongs to small and medium-sized weather system in meteorology. When strong convective weather comes, it is often accompanied by severe weather such as thunder and lightning, wind and rain, which causes houses to be destroyed, crops and trees to be destroyed, telecommunications traffic to be damaged, and even casualties.

Causes of severe convective weather

Strong convection is actually a weather phenomenon caused by strong vertical movement of air. The most typical is the strong convective weather in summer afternoon: during the day, the ground constantly absorbs short-wave radiation from the sun, and the temperature rises, releasing 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.

In the same way, the hot air near the ground rises under the buoyancy, forming a rising hot and humid airflow. When it rises to a certain height, the water vapor contained in the air will condense into water droplets due to the temperature drop. When water droplets fall, they are picked up by stronger updraft, and so on. Small water droplets begin to accumulate and integrate into large water droplets until the upper air cannot support their weight, and finally they fall into the rain. This is why thunderstorms in summer are not as rainy as spring rains in Mao Mao, and the water drops are bigger.