The gale in Nantong, Jiangsu Province has caused many casualties. Why is there a sudden strong convective weather?

On the evening of April 30, Nantong, Jiangsu and other places suffered from extreme weather such as strong winds and hail. ? According to the official report, from 08: 00 to 22: 00 on April 30, hail and large-scale strong thunderstorms and strong winds occurred in some areas of Nantong, and the maximum wind force of 66 automatic stations in the city exceeded 10. According to statistics, up to now, there are more than 3,000 people affected by the disaster, including 1 1 person who died due to falling trees, knocking down houses, scraping telephone poles and strong winds blowing into rivers. People were injured due to the disaster 102, and medical treatment is being organized.

How did the strong convective weather come about?

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. It emits long-wave radiation to heat the atmosphere. When the air near the ground receives enough heat from the earth's surface, its expansion density will decrease, and then the atmosphere will be in an unstable state, just like oil and water in a water tank. When the less dense oil is at the bottom of the water tank and the water is at the top, it will definitely have a strong upward movement, and eventually the oil will float to the water surface. Similarly, the hot air near the ground will also rise under the buoyancy, forming an upward hot and humid airflow. When the temperature drops to a certain height, the water vapor contained in the air will condense into water droplets, which will be absorbed by the stronger upward airflow when falling. This is also the case that small water droplets begin to turn into large water droplets on their own initiative until the upper airflow can't support their weight and finally fall into the rain.

What is strong convective weather?

Strong convective weather can be literally understood as this kind of strong convective weather. Generally speaking, it always corresponds to such convective clouds of small and medium scale. Judging from the types of severe convective weather, it generally includes thunderstorms, linear thunderstorms, hail and short-term heavy precipitation. At the same time, it also includes small-scale weather systems such as tornadoes and sandstorms. The spatial scale of strong convective weather is small, with a general horizontal range of about 10 kilometers, and it is relatively short, with obvious suddenness.

How to prevent strong convective weather?

Once severe convective weather appears, it will bring many dangers to people, so it is very important to learn how to prevent and deal with it. So how can we avoid the dangers around us when encountering strong convective weather? Strong convective weather affects a wide range, such as thunder and lightning, hail, local short-term strong wind and short-term heavy precipitation, which will have a certain impact on transportation, facilities and agriculture. Therefore, everyone can pay attention to the latest early warning and forecasting information released by the local meteorological observatory, pay attention to weather changes, and prepare for rain and lightning protection. Second, it is best for the elderly and children. Don't go out, stay at home. If you are outdoors, you can use rain gear or other substitutes to protect your head and move to a safe place as soon as possible.