The sudden hail in Foshan, Guangzhou and other places is as big as walnuts. How did this cold empty area form?

Due to the change of air flow, cold air and hot air meet, and the weather becomes extreme. It's not surprising that cold air went south and entered Guangzhou this year, and hail occurred in some parts of Guangzhou. We must face the incident of hail in Guangzhou. The same Guangdong, different weather! The highest temperature in many places in Guangdong has exceeded 3 degrees, and Guangdong Province has issued 71 high-temperature yellow warning signals. This high temperature will last for the next three days. There are a lot of strong convective weather in Guangdong for two days, not thunderstorm and windy weather, nor hail weather. ?

Snow is a natural phenomenon that water condenses and falls in the air. It can only appear under the influence of extreme cold temperature and extratropical cyclone. At present, Guangdong has entered the cold winter overnight, and Guangdong has officially entered the cold winter. And it is warmer in Northeast China and Hunan, but it is almost impossible to wear short sleeves. For Guangdong's friends, this cooling is still quite sudden, and friends should pay attention to prevent colds. Especially in the prevailing environment of novel coronavirus, many symptoms of colds are the same as those of many novel coronavirus, so once you catch a cold, it will not only make you uncomfortable, but also have a great impact on our access. ?

The formation of hail is a complicated process, which is usually accompanied by hail. Thunderstorm? weather Hail is a solid precipitation with a diameter of more than 5 mm falling from a powerful and developed cumulonimbus cloud, which has a spherical, conical and irregular shape. Hail clouds are huge, similar to towering mountains. Hail cloud is a further development of thunderstorm cloud. Clouds are generally thick, with strong convection in them. The height of the cloud top is over 1, meters, and the temperature is as low as-3? 4。 The lower part of the cloud is warm, about 1 meters from the ground, with high temperature and many water droplets; The upper part of the cloud is Leng Yun, which is mainly composed of ice crystals, small snowflakes and supercooled water droplets. ?

Hail is a strong convective weather phenomenon. In strong convective clouds, the height of cloud top can reach more than 1 thousand meters, and the temperature is between -3 and -4. Hail is solid precipitation. Falling from the clouds like rain and snow. Hard spherical, conical or irregular solid precipitation falls to the ground from developing strong cumulonimbus clouds. They are called hail, frozen eggs, cold eggs and so on. A kind of ice or ice falling from strong cumulonimbus clouds, which usually appears as hard spherical, conical or irregular solid precipitation. In many places, the need for nucleic acid testing for epidemic control and novel coronavirus outbreak symptoms is time-consuming and laborious, which is not worth the loss. The most important thing is to control from the source to keep warm and prevent colds. Winter is the season of rest. Although you can't continue training like summer, it is necessary to have daily training. It is very important to maintain a healthy daily life. It is very necessary to go to bed early and get up late to keep fit.