On January 30, "Zhengzhou's snowfall forecast map is all black" was on the hot search, and the official Weibo of the Central Meteorological Observatory released the relevant forecast map of Zhengzhou, and said that "such an outrageous forecast map is the first time I have seen it".
According to the Central Meteorological Observatory, starting from January 31, the central and eastern regions of the mainland will experience the largest and longest rain and snow weather process since this winter, which will also be the most complicated Spring Festival weather since 2008.
On January 30, the entry "Zhengzhou snowfall forecast map is all black" caused heated discussions among netizens, why is it "all black", @中国天气 explained:
Henan is one of the core affected areas of the rain and snow process in the central and eastern part of the country, with a long duration of rain and snow and a large cumulative precipitation! Therefore, the precipitation forecast map of Zhengzhou shows a completely black state.
01
Henan Snowfall 异常之大
It is expected that from January 31 to February 5, the central and eastern parts of the mainland will enter the longest and most extensive rain, snow and freezing weather process since the beginning of winter. 10 provinces will have blizzard or heavy snowfall, Henan, Hebei, Shandong, Liaoning, Hubei and other places of daily precipitation or cumulative snowfall is extreme, Henan, Hubei, Anhui, Hunan, Guizhou 5 provinces will have freezing rain.
Among them, Henan, the transportation hub, as the snowfall center of this process, has an unusually large amount of snowfall, which needs to be paid great attention to.
According to the Henan Provincial Meteorological Bureau, from January 31 to February 4, Henan will have five consecutive days of snowfall. The snow depth in most parts of the province is 10 to 20 centimeters, and locally it can reach 40 centimeters.
Affected by the cold air, from January 31 to February 1, Zhengzhou City, Henan Province, had a northeast wind of level 4 to 5 with gusts of 7 to 8. Since February 1, the temperature in Zhengzhou has dropped significantly compared with the previous period, and the maximum temperature has continued to be below 0 °C, of which from February 1 to 4, the minimum temperature is -8 °C ~ -4 °C. In addition, from January 30 to 31, Zhengzhou City had moderate to severe haze.
02
Rainfall is predominantly in the south
Compared with the snowfall in the north, the rain in the south is mainly rainfall in the process of this round of rain and snow, and the rainfall lasts for a long time, the number of precipitation days in the south in the next 10 days can reach 7 to 9 days, and most areas in the middle and lower reaches of the Yangtze River and its south have moderate to heavy rain, heavy rain in some areas, accompanied by a large range of thunder and lightning weather. In the process, Hubei, northwest Hunan, central and northern Guizhou and other places may have experienced rain and snow weather transitions many times, and these areas need to be especially vigilant against the occurrence of freezing rain.
According to the rain and snow calendar of large cities in southern China launched by China Weather Network, Shanghai, Hangzhou, Changsha, Wuhan, Nanchang, Nanjing, Hefei and other cities "deal with" rain almost every day, and most of them are light to moderate rain. Among them, Hefei and Nanjing will have rain and snow weather change, Hefei on the night of February 1 or sleet, 5 night or light snow, Nanjing on the night of February 4 or sleet. In addition, the rain in Guiyang will be more concentrated from February 1 to 3, during which there will be moderate to heavy rain and thundershowers.
03
Freezing rain is coming, be careful
In addition to the wide coverage, long duration and complex phase of rain and snow, this round will also have the largest range of freezing rain since this winter. According to the forecast of the Central Meteorological Observatory, from the night of February 1 to the 4th, there was freezing rain in parts of southern Henan, central and western Hubei, northern Anhui, northern Jiangsu, southern Shandong, northwest Hunan, and eastern Guizhou.
Freezing rain is the product of the convergence of cold and warm air, the so-called "dripping into ice", when the rain below 0°C falls and hits the ground or buildings, it will freeze into a layer of ice shell, called freezing rain. It is a kind of destructive weather with strong destructive force, because the ice formed by freezing rain falling on the surface of the object has a certain weight, which may cause roof collapse, power poles, trees are broken, and crops suffer frost damage.
Coinciding with the peak of the Spring Festival travel season, the slippery and icy roads brought by freezing rain will have a great adverse impact on road, rail and air travel. If you're travelling by car, it's a good idea to put snow chains on your tires and allow enough braking distance to prevent your vehicle from slipping and rolling over. In terms of rail transport, it is necessary to guard against the adverse effects of grid icing on train operation. In addition, when freezing rain comes, air transport is often affected by icing engines, as near-ground temperatures are usually below freezing.
Overall, the duration, intensity and scope of freezing weather in this process were not as good as those in the early 2008 low temperature rain and snow freezing process in southern China. However, some areas in Shaanxi, Shanxi, Hebei, Henan, Shandong, Hubei, Hunan, Anhui, Chongqing, Guizhou and other places still have the risk of low-temperature rain, snow and freezing disasters, and it is necessary to take corresponding precautions in advance.
Source: Shenyang Net, China Weather Net, Dahe Daily, Central Meteorological Observatory