On the 14th, a wide range of rain and snow in the central and eastern parts of the country continued to cool down, and the ** Meteorological Observatory issued an orange warning for cold waves, a yellow warning for blizzard and freezing, and a blue warning for high winds.
It is expected that from the 14th to the 17th, most parts of China will cool down from west to east and from north to south by 8 to 12, and the local temperature will drop by more than 20. The snowfall will gradually shift to the south on the 14th, and heavy snowstorms or extremely heavy snowstorms may occur locally in southern Shaanxi, northwest Hubei, Henan and other places, and the snowfall is expected to shrink significantly on the 15th.
*According to the analysis of the chief forecaster of the Meteorological Observatory, the current round of rain and snow cold wave has a wide range of impacts, long duration, severe cooling, complex rain and snow phases, and certain extremes.
This round of weather process not only saw heavy snowfall, but also sleet and freezing rain in some areas. According to Guerlain Fu, most of North China and Northeast China are mainly pure snow, and the process of rain or freezing rain turning into sleet and pure snow may occur in southern Shanxi, Shandong, southern Shaanxi and Henan.
Experts said that precipitation in the context of winter climate is often accompanied by the phase transformation process of rain and snow. There are many changes in the morphology of precipitation particles at different heights and under different temperature and humidity conditions. If the temperature of the upper and lower layers is lower than 0, but there is a relatively shallow warm layer in the middle, the snow in the upper layer melts to the middle warm layer, and then freezes in the cold layer below, then it is ice particles; If the warm layer in the middle is relatively thick, the snowflakes on the upper floors will not freeze after the warm layer in the middle melts, and it will rain freezing; Only when the entire floor is cold will there be snowflakes falling to the ground.
What is the impact of such widespread rain and snow on agricultural production?
* Song Yingbo, chief forecaster of the Meteorological Observatory, said that the cumulative precipitation of the two recent rains and snows in the northern wheat area is expected to reach the highest in the same period in the past 10 years, which is conducive to increasing and storing moisture in wheat fields. However, the heavy snowfall on the 13th and 15th will have a certain adverse impact on facility agriculture and animal husbandry in the north. The rainy and snowy weather in the southern region is also not conducive to the picking and transportation of ripe fruits and vegetables.
Experts suggest that the northern region should strengthen vegetable greenhouses, livestock and poultry enclosures and other facilities in a timely manner, and remove the snow in the sheds in time after snowfall to prevent the facilities from collapsing and damaging; At the same time, the temperature and humidity in the shed should be scientifically regulated, and the facilities should be warmed and supplemented, fertilizer and water management and pest control should be done. In the southern region, it is necessary to pay attention to harvesting ripe fruits and vegetables in time before the rain and snow process, and do a good job in storage, transportation and marketing.