How is hail and what is hail?

Hail, also known as hail, is most common in summer or at the turn of spring and summer. The formation process of hail is similar to that of rain. In summer, when a large amount of water vapor rises to a temperature below -20 degrees Celsius, it becomes a Xiaoice droplet, and when the air cannot hold the Xiaoice ball, it falls from the sky.

Categories: Education Science.

Analysis: Hail, commonly known as"Snow marbles".It is a weather phenomenon that can easily cause disasters.

Xiaoice is a small ice ball or ice block that falls from a cumulonimbus cloud, and a cumulonimbus cloud that can hail is called a hail cloud. In hail clouds, at first, like the cumulonimbus clouds of thunderstorms, they are also composed of water droplets, snowflakes, and ice crystals, and the updrafts in the clouds are relatively strong, which sends the growing water droplets at the bottom of the cloud to the middle and upper parts of the cloud to become supercooled water droplets, and they either collide with ice crystals and snowflakes, or freeze naturally, forming hail embryos, and when encountering supercold water droplets, a layer of opaque ice will be frozen on the surface of the embryo. When the updraft decreases, the hail embryo drops below zero degrees Celsius when part of its surface dissolves into water, and at the same time there is a part of the water droplets sticking up, when it is brought above zero degrees Celsius by the enhanced updraft again, the water on the surface of the embryo freezes down again, forming a layer of relatively transparent ice shell, because the updraft in the cumulonimbus cloud is strong and weak, so the hail embryo is churning in the air again and again, and constantly wrapped in layers of opaque and transparent ice coats, When the updraft can no longer support it, it will plummet and form hailstones.

Hail is also called hail, commonly known as hail, and in some areas it is called cold, and it is most common in summer or at the turn of spring and summer. It is as small as mung beans and soybeans, and as large as chestnuts and eggs.

The formation of hail requires the following conditions.

There must be a rather cautious layer of instability in the atmosphere.

Curomulus clouds must develop to a height that can freeze individual large water droplets (generally thought to be temperatures up to -12 -16).

There should be strong wind shear.

The vertical thickness of the cloud cannot be less than 6 8 km.

Cumulonimbus clouds contain abundant water. Generally 3 8 g m3 with a cumulative band of liquid supercooled water above the maximum rising velocity.

There should be an oblique, strong and uneven updraft in the cloud, generally more than 10 laughing cracks for more than 20 m seconds.

The symbol of hail in the weather forecast is shown in the small triangle below

Hail is formed in cumulonimbus clouds formed by convective clouds, when the water vapor rises with the air flow and colds, it will condense into small water droplets, if the temperature continues to decrease with the increase of altitude, reaching below zero degrees Celsius, the water droplets will condense into ice particles; During its upward motion, it will absorb small Xiaoice particles or water droplets around it and increase until it descends due to its increased weight, and when it descends to a higher temperature zone, its surface will melt into water.

At the same time, it will also absorb the surrounding small water droplets, at this time, if it is lifted again by a strong updraft, it will condense into ice particles and continue to condense and grow until it falls due to its own weight, and if it does not melt and dissolve into water when it falls to the ground, it is still a solid ice particle or hail.

When the temperature inside the cloud is below zero degrees Celsius, the cloud is composed entirely of water droplets, and when the cloud droplets grow in size, they fall into hail.

Hail (hail) is also called "hail", commonly known as hail, "bazi", and some areas are called "lengzi" (such as Xuzhou, Gansu and other places), and it is most common at the turn of summer or spring and summer. It is as small as mung beans and soybeans, and as large as ice grains such as orange chestnuts and eggs.

When the surface water is exposed to the sun and vaporized, and then rises into the air, a lot of water vapor is together, condensed into clouds, at this time the relative humidity is 100%, when it encounters cold air, it liquefies, and the dust in the air is used as a condensation nucleus, forming raindrops (tropical rain) or ice clumps (mid-latitude rain), which are getting larger and larger.

When the temperature drops to a certain level, the air is oversaturated, so it rains, if it encounters cold air without condensation nuclei, the water vapor will condense into ice or snow, that is, snow, if the temperature drops sharply, it will form a large ice mass, that is, hail.

Except for Guangdong, Hunan, Hubei, Fujian, Jiangxi and other provinces in China, which have fewer hailstorms, all parts of China are affected by hailstorms of varying degrees every year. Especially in the mountainous and hilly areas of the north, the terrain is complex, the weather is changeable, and there are many hailstorms, which are very harmful to agriculture.

Violent hailstorms often destroy crops, damage houses, and smash people and livestock. Huge hailstorms, even larger than grapefruits, can kill people, destroy vast tracts of farmland and trees, destroy buildings and vehicles, and more. It has great lethality. Hailstorm is one of the most serious disasters in China.

In the hail cloud, the strong updraft carries many large and small water droplets and ice crystals, some of which combine with the ice crystals to freeze into larger ice particles, and these particles and supercooled water droplets are transported by the updraft to the water accumulation area, which can become the hail core, and the core of the initial growth of these hail has good growth conditions in the water content accumulation area.

After the hail nucleus enters the growth zone carried by the updraft, it collides with supercooled water droplets in an area with a lot of water and a temperature that is not too low to grow into a transparent ice layer, and then goes up into a low temperature zone with less water, which is mainly composed of ice crystals, snowflakes and a small number of supercooled water droplets, and the hail core sticks and freezes with them to form an opaque ice layer.

When the hail is unable to support the growing hail, the hail falls in the updraft, and continues to grow by merging ice crystals, snowflakes and water droplets in the fall, and when it falls to a higher temperature zone, the supercooled water droplets that touch and go up form a transparent ice layer.

The Cantonese word for hail is hail.

Cantonese has many unique or derived words. It contains nine tones and six tones, retains more of the characteristics of ancient Chinese, has a complete series of characters, can be fully expressed in Chinese characters (Cantonese characters), and is the only Chinese Hanzhou Sign Language that has been independently studied in foreign universities except Mandarin.

At present, Cantonese has the status of an official language in Hong Kong and Macau, and is the fourth most spoken language in Australia, the third most spoken in the United States and Canada, and the second most spoken in New Zealand.

Cantonese is the mother tongue of the Cantonese people and an important carrier of Cantonese culture. Cantonese is written in English as "cantonese", and Japanese is written as "広东语", which is generally called "Cantonese". Due to the differences between China and the West in terms of linguistic classification, it is still controversial whether Cantonese is an independent language or a dialect.