Traditional Culture Encyclopedia - Weather inquiry - Where it snowed in May 2023.

Where it snowed in May 2023.

Since May, abnormal snowfall has occurred in Yan 'an, Baoji, Ningxia and Xinjiang in Shaanxi.

Residents put away their winter clothes, and many local netizens are saying, "I wore short sleeves yesterday and down jackets today." "What's wrong with the weather this year?" This snow has a great influence on local crops. Some crops such as cucumber, corn, buckwheat, etc. of nearby farmers were all frozen, and the newly grown wheat seedlings died.

Around May of 18, cold vortex and trough continuously affected northern China from Siberia. The strong cold vortex drives the cold air south, which leads to the sudden drop of temperature in northern China, and the 24-hour temperature drop in some stations is obvious.

According to the forecast of the climate trend in the flood season in 2023 released by China Meteorological Bureau, it is predicted that this summer, except the temperature in central and northern Heilongjiang Province is slightly lower than normal, the temperature in most parts of the country is higher, including southern Henan, western Anhui, northwestern Jiangxi, northern Hunan, Hubei, most of Chongqing, eastern Sichuan, southwestern Shaanxi, western Gansu and most of Xinjiang, where the temperature is higher 1 ~ 2 degrees, and there may be staged high-temperature heat waves.

According to research and forecast, the national temperature this year is still high compared with the multi-year average, but the intensity and duration of high temperature weather nationwide are weak. The frequent and violent occurrence of extreme events caused by global warming will still exist.

The cause of snow formation

Snow is a natural phenomenon. Due to the difference of meteorological conditions and growth environment in the sky, all kinds of atmospheric solid precipitation are caused. The names of these atmospheric solid precipitation vary from place to place, from person to person, varied and extremely inconsistent.

For convenience, the International Ice and Snow Committee under the International Hydrological Association held a special international conference in 1949 on the basis of consulting experts from various countries, at which the proposal of "Concise Classification of Atmospheric Solid Precipitation" was adopted.

This concise classification divides atmospheric solid precipitation into ten types: snowflake, star snowflake, columnar snowflake, needle snowflake, multi-branch snowflake, axial snowflake, irregular snowflake, graupel, ice particle and hail. The first seven kinds are collectively called snow.

The latter three cannot be called snow, because there are two processes from gaseous water vapor to solid water. One is that water vapor first becomes water, and then water condenses into ice crystals. Another is that water vapor directly becomes ice crystals without water. This process is called water condensation. Therefore, snow is solid precipitation formed by condensation of water vapor in the sky.