Xinhua News Agency, Beijing, February 6th Title: Cold wave is coming Experts remind you to pay attention to the wind-cold effect
Xinhua News Agency reporter Huang Yao
According to the forecast of the Central Meteorological Observatory, a new strong cold air from north to south affects the central and eastern regions from the 6th to the 8th, bringing strong winds and cooling weather. The Central Meteorological Observatory issued a blue warning for cold waves and a yellow warning for strong winds on the 6th.
It is expected that most areas in the Huanghuai region and its north will cool down by 6℃ to 8℃, among which the cooling amplitude in the eastern part of the northwest region, North China and some areas of the Huanghuai region will cool down by more than 10℃; most parts of the south will cool down by 4℃ to 6℃, with local cooling amplitude It can reach more than 10℃. On the morning of the 8th, the lowest temperature 0℃ line will press south to the area between southern Guizhou and southern Jiangnan.
“The cooling rate of this cold wave is not particularly large, but we must pay special attention to preventing strong winds.” Zhang Tao, chief forecaster of the Central Meteorological Observatory, said that the strong winds mainly occur in the Qinghai-Tibet Plateau and the North China Plain, and strong winds are for the densely populated North China region. The impact is greater.
During the process, there will be strong winds of level 4 to 6 and gusts of level 7 to 8 in the areas north of the middle and lower reaches of the Yangtze River. Among them, gusts of 9 to 10 in central and northern Shanxi and some areas of Beijing-Tianjin-Hebei can reach 9 to 10.
Many netizens said that they were trembling as soon as they went out, but they took out their phone to see that the temperature was not very low, so why did they still feel so cold?
In fact, this is all because of the “wind-cold effect”. The wind-cold effect is a phenomenon in which natural wind causes the somatosensory temperature to be lower than the actual temperature. Normally, the temperature of the human body will be higher than the ambient temperature. In the case of quiet wind or breeze, the air around the human body will wrap us like a quilt, which will keep us warm.
When the air flow accelerates, the air insulation layer around the human body will be constantly replaced by new cold air and take away heat, resulting in a drop in somatosensory temperature. The greater the wind, the faster it takes away heat, and the more heat the human body loses. Therefore, under the same temperature, wind always feels colder. In addition, the wind-cold effect is closely related to humidity. Humid air has stronger thermal conductivity and can take away heat faster.
Experts remind that before going out in winter, you must not only look at the temperature of the day, but also pay attention to the wind speed and humidity, so that you can take measures to prevent cold and keep warm in all aspects.
The wind-cold effect often occurs on naked skin, especially on the human head. Experts recommend that the public should try to choose windproof and warm clothing such as down jackets and fleece jackets and wear hats, scarves and gloves when going out.
[Editor in charge: Diao Yunjiao]
