In the past two days, not only the sunshine that looks warm in the morning has been wake, but also the cold air that is pressing, and the "quick freezing" mode is on. Next, the city is mainly sunny to cloudy, the temperature remains low, Friday (22nd) will be -9 to open the number of nine cold days of Hefei people this winter, and the public needs to take measures to prevent cold and keep warm.
How cold was Hefei in history?
During this time, I believe that the citizens have felt the power of the cold wave, but this is not the coldest time in Hefei. It was learned from the meteorological department that the historical extreme value of the annual minimum temperature in Hefei did have a statistical record, which was -20 in January 19556℃。
After 2000, the extreme minimum temperature in Hefei was the heavy snowfall in February 2008, which caused the temperature to be extremely low, and the low temperature reached -112℃。In addition, the great cold wave of the century in 2016 also had a great impact on Hefei, with a minimum temperature of -98℃。
On Friday, Hefei may hit a new low temperature since this winter.
On December 21, China's weather *** As the cold air continues to move south, in the next three days, the temperature in many places in the central and eastern regions may refresh the new low since this winter, and the body feels cold and cold, and the cold degree is comparable to the perennial "Sanjiu". The reporter also learned from the Hefei Meteorological Department that due to the influence of cold air in the early stage, the base temperature was not high, the sky was clear on the 20th, the radiation cooling was obvious, and the minimum temperature in Hefei fell to -7 on the morning of the 21st1. The blue warning signal for low temperature and freezing issued on the 15th is still maintained.
In the next 5 days, the city will be mainly sunny to cloudy, and the temperature will remain low. Friday (22nd) will enter the "winter solstice" in the 24 solar terms, and the minimum temperature in Hefei is expected to be about -9 tomorrow, which will refresh the lowest temperature record since the beginning of winter this year. Although the daytime temperature has entered an upward channel since Saturday (23rd), it is still below freezing in the morning and evening.
Looking at the situation in the province, Anhui will be dominated by sunny to cloudy weather in the coming week. Affected by the cold air, the temperature continued to be low, and the lowest temperature appeared on the morning of the 22nd, -10 -7 in the mountainous areas of Jiangbei and southern Anhui, and -8 -5 in other areas. There is still icy roads in some parts of Gangnam, which has an adverse impact on traffic. The temperature in the province gradually rose from the 23rd, and the maximum temperature generally rose to about 10 from the 25th to the 27th.
It's said that it's a warm winter, why is it still so cold?
*According to the meteorological observatory, according to the temperature anomaly since the beginning of winter, in early December, it was severely warm, and in mid-December, it was significantly lower in the central and eastern regions. On the whole, except for the northeast region, other regions are still warm, which is considered a warm winter. Meteorological data show that from November 20 to December 19, the average temperature in Anhui was 77, 0. higher than usual9℃。Hefei was seriously warmer in early December, setting a new record for the highest temperature in early December on the 8th with 24.
According to the National Climate Center, when we talk about the warmth of a certain year or month, it is not determined by a single weather event, but by comparing the average temperature of the entire period of time, whether it is significantly higher or lower than the same period in history. According to the statistical analysis of historical data, the winter temperature in China is generally warm under the background of El Niño, but the periodic cold air activities are more frequent, that is to say, the fluctuations of cold and warm are more obvious.
However, the intensity of the cold air process is not only affected by El Niño, but also has a lot to do with the disturbance of the Arctic vortex and the westerly wind belt in the middle and high latitudes. Since mid-December this year, the Arctic vortex** has been bicentric, located over Greenland and Siberia. With the violent distortion of the westerly wind belt over Eurasia, the Siberian high has strengthened abnormally, and most areas of China have changed from the prevailing southerly wind to the northerly wind, and the cold air has moved southward, resulting in a sharp drop in temperature.
On the other hand, the El Niño-induced anomalous anticyclone in the Philippines transported tropical water vapor to mainland China, so the cold wave process from the middle and high latitudes combined with the abundant water vapor conditions from the low latitudes led to a large range of snowfall in the central and eastern parts of China. In addition, the increase in albedo in clear skies caused by snow on the ground also made the temperature recovery slower in the later period.
China is a climate change-sensitive area with significant impacts, and although the warming rate is higher than the global average, the intensity of extreme cold waves has not weakened, and the impact range of strong cold air or cold waves has increased. The National Climate Center predicts that in the second winter (January-February 2024), the intensity of the winter monsoon in East Asia will be generally weak, except for the northeast of Inner Mongolia, the northern part of Heilongjiang, most of the country, and the southern part of Qinghai The temperature is lower than that of the same period in normal years, but the temperature in most parts of China is close to normal, but the cold and warm fluctuations are obvious, or the temperature "roller coaster" will be experienced again.
Hefei Tong client - Hebao reporter Shao Xiaojie.