Xi may encounter a high temperature lasting 40 degrees. What is the reason for this round of high temperature?

These two days, Xi 'an started the barbecue mode. Meteorologists said that the hot weather in Xi will continue this week. Although the temperature predicted by Meteorological Observatory No.6 is 40℃, it is likely to exceed 40℃. And remind the general public to prepare for heatstroke prevention and cooling.

Speaking of Xi, I think of a trip a few years ago. It was also summer when I went. Although the weather is quite hot, the temperature this year is not so exaggerated. It can reach such a high temperature this time, and it will exceed 40℃ in two days.

In previous years, Xi 'an experienced extreme high temperature weather many times. According to experts from Xi Meteorological Bureau, the highest temperature in Xi 'an appeared at 65438+June 2 1 0966, and the temperature reached 43.4℃. In recent ten years, the highest temperature in Xi appeared in June 2006, reaching 42.9℃. According to the data of the last five years, the longest duration of high temperature weather is July 20 17, with 22 days of high temperature days above 35℃ and 10 days of high temperature days above 40℃.

This time, the high temperature in Xi 'an will continue, and the reason can still be analyzed.

One thing is actually worth noting. As mentioned above, from the data of recent years, the high temperature days in Xi 'an in previous years generally appeared in the middle and late July. In fact, since mid-June, the temperature in Xi has started to rise. The red high temperature warning was issued on June 16, and again on June 17.

No, it will be hot again in July. It is said that the highest temperature in Xi will continue to exceed 40 degrees in the future.

The first thing to say is the geographical environment of xi 'an, Guanzhong, Shaanxi, Qinchuan in 800 miles, and Xi 'an is 400 -700 meters above sea level. Unlike a basin, the Loess Plateau in the north, the Qinling Mountains in the south and the Guanzhong Plain in the middle are actually not conducive to air flow. You can think of it as an aluminum basin, which has a good atmospheric insulation effect, but this terrain will gather heat and the temperature will naturally be high.

In addition, Xi is affected by the western Pacific subtropical high, which has a great influence on China. It is located in the western Pacific Ocean in the northern hemisphere and exists all year round. It is relatively stable and inactive, so Xi 'an is easily influenced by it. Everyone must have watched the weather forecast. Every time the forecast says that the subtropical high controls the northern region, it refers to it. Subtropical high pressure controls an area for a long time, which is easy to cause high temperature weather.

Urban heat island is also a factor that cannot be ignored. I remember this is a knowledge point of junior high school geography, which is easy to understand. Cities are all reinforced concrete, and the temperature rises rapidly, so the temperature in the urban area is definitely higher than that in the surrounding suburbs. In summer, air conditioning is a necessity. In summer, when the sun is "big", the wall temperature will inevitably rise, so air conditioning has become a necessity for everyone. Do you have the feeling that every time you walk next to the outdoor unit of the air conditioner, you will blow out a hot air? Think about it, there are tens of thousands of air conditioners in use in a city. Can the temperature be low? This is the urban heat island effect.

What I told you above is actually an objective reason. At this stage, we can't change. Various factors affecting the high temperature weather in Xi will not change obviously in the short term. It can be said that there will be fluctuations, so the high temperature in Xi 'an will last until summer.

In fact, there is another problem that my friend cares about. How is it comfortable to wear a mask on such a hot day?

N95 is not just needed.

N95 mask has good air tightness, but poor air permeability. Disposable medical masks can effectively protect and are very light, so everyone can wear disposable masks. I have been wearing a disposable medical mask, which is very convenient for ventilation.

Proper lookout

If your place is crowded with people, you can take off your mask and breathe fresh air in a place where there are few people to rest. I often do this, especially where I need to wear a mask all the time. I really need to pay attention, or my mind will buzz.

Please change the wet mask

Nowadays, many masks are melt-blown cloth, and too much moisture will protect the urban area. So if you sweat too much on your face or drink water to wet the mask, it is recommended to replace it in time.

In a word, it is already hot in Xi, so we must pay special attention to avoid exposure to the sun. It is very important to take necessary sun protection measures and replenish water when going out. The elderly, pregnant women, infants and patients with respiratory, cardiovascular and cerebrovascular diseases should try not to go out during the high temperature period at noon.