The cold air arrives in Beijing and the high temperature exits on the night of the beginning of autumn
The Municipal Meteorological Observatory predicts that the highest temperature this week will be around 30°C, and the lowest temperature at night will drop to between 19°C and 24°C.
Last week was the hottest week in Beijing since the beginning of summer. From August 2 to 7, Beijing was in a high temperature yellow warning. The highest temperature in most areas was around 35°C, and the relative humidity was high, making it sultry.
At 20:29 on August 7th, the beginning of autumn came. The good news is that after the cold air arrived in Beijing on the night of the 7th, the temperature and humidity dropped immediately. The highest temperature in Beijing this week (August 8th to 14th) is expected to be 30 Around ℃, the hot and muggy weather of last week is completely over.
Beijing is only one of the manifestations of this high temperature weather. Since June 13 this year, my country's high temperature weather has lasted for more than 50 days.
The high temperature will continue unabated in the next 10 days, and the central and northern Jiangnan, Sichuan Basin, Jianghan, Jianghuai and other places will continue to have high temperature weather, with local temperatures reaching 40°C or above.
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What is the cause of this round of high temperature in Beijing?
Since August, Beijing has been sultry and hot, and the wind blowing on the streets is hot. Many citizens feel the heat is unbearable, "like a steamer."
In summer, the temperature is high, and the humid and hot weather will give people a "sauna feeling".
"Sauna day" is not only a metaphor, but also a meteorological term.
According to the "Sauna Weather Rating", sauna days refer to hot and humid weather with high temperature, high humidity and low wind speed, which makes people feel like a sauna.
In Beijing, Tianjin, Hebei and other places, the criteria for determining sauna days are the daily maximum temperature ≥32°C, the daily average relative humidity ≥60%, and the daily maximum wind power ≤3.
Compared with "dry heat", when "stuffy" has high humidity, it will make it difficult for the body to dissipate heat, and the body temperature will rise. The temperature may not meet the high temperature standard, but it is also uncomfortable and brings health risks.
Last week was the hottest week in Beijing since the beginning of summer.
On August 2, the Beijing Meteorological Observatory issued a high temperature yellow warning, and in the early morning of the 5th, the high temperature yellow warning was extended to the 7th.
The warning information shows that from the 2nd to the 7th, the highest temperature in most parts of Beijing is around 35 ℃, and the relative humidity is relatively high, making the body feel sultry.
With a high temperature of 35°C, under the blessing of humidity, the somatosensory temperature can reach 40°C or even 45°C.
What is the cause of this round of hot weather in Beijing?
Li Chen, chief of the Beijing Meteorological Service Center, said that since August, the subtropical high pressure in the western Pacific has been relatively strong, and it has moved northward to North China. Larger. This weather situation was stable from August 2 to 6, which led to this round of hot and muggy weather.”
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Does the beginning of autumn mean to cool down?
After a thunderstorm, temperatures are expected to drop this week (August 8-14), bringing last week's sweltering heat to an end.
At 20:29 on August 7th, the beginning of the autumn solar term was ushered in, but the beginning of autumn was still in the hot period, and the summer had not yet come out.
The "Liqiu" day is often still in the middle period, that is to say, the hot summer is not over, and the real coolness usually comes after the Bailu solar term.
It is expected that the maximum temperature during the day on the 8th will be around 30°C, and the minimum relative humidity will be around 45%.
The Beijing Meteorological Observatory predicts that most of the time this week (August 8 to 14), the weather will be mainly sunny to cloudy, and the temperature will drop a lot compared with last week. The maximum temperature is basically around 30℃, especially at night, the minimum temperature drops to between 19°C and 24°C.
However, there is sufficient sunlight during the day, but it will still feel sultry in the afternoon. After all, it is still in the middle, so you should still pay attention to sunstroke prevention and sun protection when you are outdoors.
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How will the national high temperature situation develop?
Since June 13 this year, my country's high temperature weather has lasted for more than 50 days.
According to the latest monitoring and assessment of the National Climate Center, the comprehensive intensity of regional high temperature and heat wave events since June 13 has now ranked the third strongest since 1961, second only to 2013 and 2017.
As of late July, 124 national observatories in my country have broken historical high temperature records, accounting for 5.1% of all national observatories.
Not only my country, but this summer, there have been "simultaneous" high-temperature heat waves in many places around the world.
Recently, the UK Met Office issued the first ever red warning for extreme high temperature, and devastating wildfires broke out in many parts of southern Europe and North America.
Meteorological experts said that considering the increasing frequency of extreme events in the context of global warming, synchronized global high-temperature heatwave events will become more and more common in the future.
How will the high temperature situation develop in the long run?
After comprehensive research and judgment, the Central Meteorological Observatory stated that the high temperature weather in my country will continue in the near future, and the comprehensive intensity of high temperature and heat wave events will continue to increase.
In the next 10 days, the high temperature will continue unabated. The central and northern Jiangnan, Sichuan Basin, Jianghan, Jianghuai, southern Shaanxi, Henan, and southern Xinjiang Basin will continue to have high temperature weather. 40°C or above.
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What are the effects of continuous high temperature on production and life?
This year is not only hot, there are more hot days.
Data from the National Climate Center shows that since the beginning of summer this year (June 1 to August 2), the national average number of high temperature days has been 9.2 days, 3.6 days more than the same period in normal years, the most in the same period in history since 1961.
The continuous high temperature weather has adversely affected production activities and human health in many places.
This summer, many people in Zhejiang, Jiangsu, Sichuan and other places were diagnosed with heat stroke. From July 1 to 14, Shenzhen 120 received a total of 73 emergency heatstroke alarms.
In addition to harming human health, high temperature also has adverse effects on energy and agriculture.
Since June 13, the power load of Hebei, Shandong, Zhejiang, Henan, Shaanxi, Gansu, Ningxia, Xinjiang and other provinces (regions), as well as the Northwest Power Grid and China Southern Power Grid, have reached a record high. Last year, it increased by 33.56%; due to high temperature and little rainfall, soil moisture deviation in eastern Zhejiang, western Henan, southern Shaanxi, southern Gansu, northern Sichuan and other places, and meteorological drought continued or developed in some areas.
Take Beijing as an example. On August 2, Beijing issued a high temperature yellow warning.
On the same day, the surface temperature of the apron at the Capital Airport reached about 60°C, and the ground support staff of the airline worked under the scorching sun to ensure flight safety.
In order to reduce the health risks caused by hot weather, Beijing has shortened the single continuous operation time of front-line employees to avoid exposure to the scorching sun at noon.
In the high temperature warning weather above 35°C, artificial outdoor operations are mostly carried out in the morning and evening when the temperature is relatively low, and operations are not carried out from 11:00 to 16:00.
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What is the cause of extreme heat in the Northern Hemisphere?
Zhou Bing, chief expert of climate services at the National Climate Center, introduced that this year's high temperature heat wave is extremely rare in a sense.
What is the cause of extreme heat?
He analyzed that the extreme high temperature in the northern hemisphere is caused by multiple factors: global warming is the climate background for the frequent occurrence of high temperature and heat waves in the northern hemisphere, and the continuous abnormality of atmospheric circulation in the mid-latitudes is the direct cause of the frequent occurrence of high temperature and heat waves in many places around the world.
Since June this year, over the subtropical regions of the northern hemisphere, the subtropical high pressure in the western Pacific, the Atlantic high pressure and the Iranian high pressure have all intensified in stages, thus forming a large-scale global warm high pressure belt, so that the hot air remains near the ground and cannot be dissipated. Then there was a high temperature heat wave event.
Not only that, the impact of the three-year La Niña climate event on atmospheric circulation anomalies cannot be ignored.
Zhou Bing explained that since the spring of this year, the La Niña event in the equatorial eastern Pacific has not weakened, but has intensified, coupled with the abnormal sea temperature in the Indian Ocean, which has promoted the continuous strengthening of the subtropical high.
The sixth assessment report of the United Nations Intergovernmental Panel on Climate Change pointed out that in the past 50 years, global warming has occurred at an unprecedented rate since the past 2,000 years, exacerbating the instability of the climate system.
That is to say, for a long time to come, global weather and climate fluctuations will become more severe, and extreme weather such as high temperature and heat waves may become the norm that cannot be avoided.
Beijing News reporter Wang Jingxi