What are the signs of thunder and snow in spring? What do people think about this?

What are the signs of thunder and snow in spring? What do people think about this?

It is normal for thunder and rain in spring. Every spring, especially after dormancy, the obviously enhanced warm and humid air confronts fiercely with the unruly cold air, resulting in a strong vertical convection movement of the air. When moist warm air rises to a certain height, it will form high cumulonimbus clouds. The strong electric field in the cloud will make the positive and negative charges collide and discharge, thus causing sudden lightning.

Spring thunder formation:

Spring thunder, meteorological term. Every spring, especially after dormancy, the obviously enhanced warm and humid air confronts fiercely with the unruly cold air, resulting in a strong vertical convection movement of the air. When moist warm air rises to a certain height, it will form high cumulonimbus clouds. The strong electric field in the cloud will make the positive and negative charges collide and discharge, thus causing sudden lightning.

Thunder only conforms to the meteorological laws in some parts of southern China. In spring, affected by the warm and humid airflow in the south, the air is humid and the solar radiation is strong. The air near the ground is constantly heated up, and the upper cold air sinks, which is easy to form strong convection, so there are many thunderstorms and even hail. It can be seen that the occurrence of lightning at this time is not only related to the increase of near-surface temperature, but also related to the cold air activity and the obvious increase of water vapor in the air.

Spring has come. With the enhancement of warm and humid air and abundant water vapor, the towering thunderstorm cloud system develops, so spring thunder occurs every year.

Why are there many thunderstorms in summer?

Thundershower is produced under the condition of strong convective movement of wet air, and its occurrence is closely related to the stability of the atmosphere.

In summer, on sunny and windy days, the ground is exposed to strong sunlight, and the air close to the ground is heated. The closer to the ground, the higher the temperature rises. Afternoon is the time when the ground temperature rises the highest, and it is also the most unstable period of the day, so the strong convection movement develops the fastest at this time. If the air is very humid and rich in water vapor at this time, there will be thunderstorms in the afternoon and evening. This kind of thunderstorm formed by intense ground heating is called thermal thunderstorm. From midnight to morning, the ground temperature drops to a minimum, the atmosphere tends to be stable, and it is not easy to form thermal thunderstorms.

The occurrence of thunderstorms in spring is different from that in summer. Hot thunderstorms in summer mostly occur under the same heating air mass, and the weather is sunny the day before the thunderstorm, while thunderstorms in spring mostly occur in the area where cold and warm air masses meet. When two cold and warm air masses meet, warm and humid air climbs on the back of cold air, and a large amount of water vapor condenses out, which makes the sky gloomy. It has rained for several days, and there is no sunshine on the ground all day. It is impossible for the temperature to rise very high during the day and fall very low at night, and the daily change of the temperature is very small. But at the top of the high-altitude clouds, the sun is still shining during the day, and the temperature there changes greatly every day.

During the day, the clouds are very hot by the sun, the temperature is easy to rise, the atmospheric head becomes lighter, the stability increases, and the possibility of thunderstorm formation decreases; At night, the cloud top radiates heat into space, and the temperature in the upper part of the cloud drops, especially from midnight to morning, the temperature drops to the lowest value of the day, and the atmospheric head becomes heavier and tends to be unstable. Convective movement develops in this cloud, forming a Lei Yun with thunder and lightning and torrential rain. This is why spring thunder appears from midnight to morning.

How is lightning formed?

Lightning is a strong discharge phenomenon between clouds, between clouds and the ground, or between different parts of clouds (usually in cumulonimbus clouds).

Usually, storm clouds (cumulonimbus clouds) will generate charges, with negative charges at the bottom and positive charges at the top, and the ground will also generate positive charges, which will move with the clouds. Positive and negative charges attract each other, but air is not a good conductor. Positive charges rush to tree tops, hills, tall buildings and even human bodies in an attempt to meet negatively charged clouds; The negatively charged dendritic antenna extends downward, and the farther it extends, the closer it is to the ground. Finally, the positive and negative charges finally overcome the air barrier and connect. A huge current rushed from the ground to the clouds along the conductive path, producing a bright flash.

The length of lightning may be only a few hundred meters (the shortest is 100 meter), but the longest is also several kilometers. The temperature of lightning varies from 17000 degrees Celsius to 28000 degrees Celsius, which is equivalent to 3-5 times the surface temperature of the sun. The extreme heat of lightning caused the air along the way to expand violently. Air moves very fast, so waves are formed and sounds are made.