Which clouds in the low clouds in the sky are prone to weather phenomena such as thunderstorms or hail?

Yes, to convective clouds, that is, cumulonimbus clouds.

It mainly refers to convective clouds, which are developed from cumulus clouds. Its cloud base is low (no more than 1.5km above the ground), while its cloud top is high, in which there is a violent vertical movement of airflow. When it appears, it will bring lightning, strong winds and precipitation, and sometimes even short-term heavy rainfall, hail, tornadoes and other disasters.

In temperate regions, it usually appears in the summer afternoon; In the tropics, especially in the equator, it happens all year round.

Popular science:

Convective clouds are cumulus clouds formed by convection in unstable atmosphere due to thermal or dynamic reasons. The clouds formed by thermal convection are isolated and scattered, with obvious diurnal variation; Clouds formed by dynamic convection tend to grow into strips and can appear at any time of the day.

Through a two-dimensional elastic convective cloud numerical model with terrain treatment, the influence of different environmental winds on the development of convective clouds on sloping terrain is simulated. The simulation results show that the environmental wind field has great influence on the convective cloud development intensity, cloud structure and surface precipitation caused by topographic uplift. When the upwind direction is opposite to the climbing direction, the greater the wind speed in the upwind direction, the greater the convection intensity. When the upper-middle wind direction and the climbing wind direction are the same, the ambient wind shear weakens the maximum intensity of convective clouds.

Convective cloud is the main precipitation cloud system in summer in southern China, and it is also the main object of artificial precipitation enhancement in southern China. In order to solve some technical problems of artificial precipitation enhancement by convective clouds in southern summer as soon as possible, in 2000, Anhui, Fujian, Jiangsu, Guangxi, Hunan, Guizhou, Zhejiang, Jiangxi and Ningbo People's Shadow Office (scientific research institute) jointly formed a research collaboration group on artificial precipitation enhancement by convective clouds in southern summer, and carried out research work on artificial precipitation enhancement by convective clouds in southern summer. The research work is based on the "Development and Utilization Project of Air Cloud Water Resources in Anhui Province", and the "Demonstration and Experimental Base for Artificial Precipitation Enhancement by Convective Clouds in Jianghuai Area" has been established. Since 2002, the base has systematically studied the artificial precipitation enhancement technology of convective clouds in southern summer.

That is, cumulus clouds are formed when the air convection motion is not very strong (generally, the vertical velocity is not more than 5m/s). Cu hum is an isolated and scattered small cloud block with a flat bottom and a circular bulge at the top, like a small mound, and its vertical thickness is less than its horizontal width.

Extracurricular deduction

The clouds in the sky are like magicians. Their shapes will change. Every time they change a type, it represents some kind of weather. As the saying goes, "Seeing the weather from the clouds" means that as long as we know different types of clouds correctly, it can help us predict the weather in the next few days. For example, "there are clouds hanging in the sky and it is raining on the ground." Hook clouds are called hook cirrus clouds in meteorology, which generally appear in front of warm fronts and low pressures. This is a sign of rain. However, if the hook cloud appears after rain or winter, it will appear sunny or frosty continuously, so there are proverbs that "the hook cloud dissipates, and the sunny day is drier" and "the winter hook cloud rises". "Carp spots in the sky don't need to be turned over tomorrow" (Wayun, sunburned people) refers to translucent altocumulus clouds, and the air mass that produces this cloud is stable in nature, at night. If the cloud looks like a tiny fish scale, it is cirrocumulus. This kind of cloud mostly appears in front of the trough of low pressure or around the typhoon, and it will be windy or rainy in the near future. Therefore, there is a proverb that "there is wind and no rain in fish scales". "The clouds go east and the wind blows; Cloud refers to the low cloud in the low pressure area. The low pressure is from west to east (in fact, it often moves from southwest to northeast). The cloud goes west, which means this place is in front of the low pressure, because it will rain locally. The cloud moves eastward, indicating that the low pressure has moved past the local area, and the local area is behind the low pressure. The weather is about to clear up, and there is often a strong wind before it clears up. " Cloud hook refers to the tail of the hooked cloud, which appears in the sky, and sometimes there are small hooks at the top, which are also arranged in rows. The small hook at the upper end refers to the direction of the high-altitude wind, which is often associated with the ground, so the direction of the cloud hook is generally subject. "Wind comes without rain" means that there are dark clouds covering the sun in the southeast in the morning, which indicates rain. Because the warm and humid southeast wind blows in the morning, the temperature is higher than the local air, forming upper cold and lower hot, and the water vapor is easy to rise into clouds. In addition, during the day, the ground is heated, and the air convection rises, which further promotes the cloud to rise, and the water vapor turns into water droplets when it is cold, which may make the weather fly up and down in the windless and rainy Huang Yun, and it will produce ice eggs. "Huang Yun is warm and humid most of the time. In this case, showers and hail often occur. " Wearing a hat on the mountain means that the air pressure is low, and most of the water vapor in the air forms clouds at the top of the mountain. As for whether it will rain, it generally depends. If the clouds gradually decrease and thicken, there is a great possibility of rain. On the contrary, when the clouds gradually rise and thin, the possibility of rain is small. "Clouds eat fog, fog and clouds clear up". When you see fog, you will come to the clouds, and the air pressure may be low. It means that the low pressure has passed and sunny weather is coming. "Three winds and three winds, one blowing for three days" refers to spring. If there is strong cold air from the north, it will be windy. After the strong wind has passed, there will be a small stream of cold air moving intermittently behind, usually blowing for two or three days. "Turn around, the wind is particularly strong" and when it moves in a certain direction, if it suddenly changes direction, it means that there will be a front crossing and a storm warning. ".It is a warm and humid air flow from the sea, but if it is not lifted by a cold air flow, it is generally impossible to form clouds and cause rainfall. "The west is sunny for a long time, and the west is sunny for a long time. "Although there is warm and humid air from the sea, it is not easy to rain if there is no cold air rising. If there is cold air from the northwest at this time and the warm and humid airflow rises, it is easy to form clouds and cause rainfall. If the northwest wind blows in the case of long rain, it will drive out the local warm and humid air, so the weather will soon clear up. " The wind blows a large area, and the hail hits a line "is a flowing atmosphere, so it involves a wide range and a large area." Hail is an ice crystal frozen by water vapor, which rises and falls several times. Therefore, it fell to the ground. Because of the uneven disturbance intensity in the cloud, the width of the strong disturbance cloud that can form hail is not large, generally only three to five kilometers, and some are even narrower, but its moving path can extend to far places, making the hail area strip-shaped. So there is a saying that hail hits the line.