Why do you still feel hot before reaching the high temperature line?, Sauna Day is strong online, and the rainy season in early July continues to control the Shanghai Meteorological Bureau | Temperature | Shanghai

This year, there was a feeling of plum rain in Shanghai, and rainstorm warnings were frequent. The most recent one was the yellow warning of rainstorm in the city issued at 18:49 last night. According to meteorological data statistics, from June 21st to 30th, the cumulative precipitation in the central urban area was 152.4 millimeters, nearly 50% higher than the same period in previous years.

I'm tired of the wet days of holding umbrellas. When will the rainy season end? In theory, after this week, the rainy season will come to an end. Because the annual plum blossom day in Shanghai is July 10th. In fact, the specific situation varies every year, depending on the amount of rainfall, rainy days, and the location of the subtropical high pressure ridge.

It can be confirmed that starting tomorrow, with the southern retreat of the subtropical high pressure, the Meiyu belt will fall southward, and the rainy weather in Shanghai will continue for about 4 days. Among them, the rain was more pronounced from the 7th to the 8th.

Under the pressure of rainwater, Shanghai finally withdrew from the high-temperature zone starting from the day after tomorrow. The daytime temperature will drop sharply by 5 ℃, and the highest temperature will be between 30 ℃ and 32 ℃ until the 8th. The lowest temperature will be between 27 ℃ and 28 ℃.

Although it has not reached the high temperature line, the municipal meteorological bureau department reminds everyone that the feeling is still quite stuffy, and the feeling of steaming sauna will be very obvious. Why do you still feel hot even though the temperature is not so high?

Firstly, you need to know that the perceived temperature is not measured in a louver box, but is influenced by the combined effects of temperature, humidity, wind speed, and radiation. There are two things that are difficult to understand, one is temperature, which is the temperature predicted by the weather forecast; The second is radiation, which refers to direct sunlight exposure and surface radiation. Direct sunlight exposure to the body can cause an increase in body temperature, and surface radiation is no exception. The surface temperature is high, and the heat scattered outward is large. For example, cement floors under sunlight and cooler water bodies or wetlands have significantly different perceived temperatures.

Recently, people have been feeling stuffy and hot, mainly due to heavy rainfall and high humidity. Usually, when the temperature is relatively high and the humidity is relatively low, the human body does not feel uncomfortable because the water on the surface of the body evaporates strongly and feels relatively dry.

Taking the Jiangnan and South China regions with the strongest sense of stuffiness recently as an example. The Central Meteorological Administration stated that the minimum relative humidity in southeastern Zhejiang, central and southern Jiangxi, southern Hunan, Guangdong, Guangxi, Fujian, Hainan and other areas will mostly exceed 60%. According to the NOAA Heat Index in the United States, the perceived temperature in these areas may reach 40 ℃, and the lowest nighttime temperature is mostly around 27 ℃, as if in a natural steamer, hot to the point of almost melting.

Sauna days are more likely to cause heatstroke and heat stroke. Generally speaking, when the temperature reaches 35 ℃ and the humidity exceeds 60%, it reaches the critical point of heat stroke; When the temperature exceeds 37 ℃ and the humidity exceeds 80%, it is very easy to get heatstroke. When the temperature is too high, it leads to dysfunction of the body's temperature regulation function, excessive accumulation of heat in the body, which can cause damage to nervous organs. In severe cases, symptoms such as sustained increase in body temperature, shortness of breath, and increased heart rate may occur, even endangering life.

It is recommended that everyone avoid prolonged outdoor activities during the high temperature period from 10 to 16 o'clock, and supplement with diluted salt water appropriately. If you need to go out, you should do a good job of sun protection, such as wearing a sun hat and breathable sun protection clothing, to avoid sunburn.

The good news is that the subtropical high pressure has been strong recently, and the typhoon has entered a "holiday". The Central Meteorological Observatory predicts that in the next 10 days, there will be tropical cloud activity in the central waters of the South China Sea and the ocean east of the central Philippines, which may generate low value systems, but the possibility of developing into typhoons is unlikely.

According to the Shanghai center Meteorological Observatory, today's main rain belt is located in Chongqing, southern Shaanxi, central Henan and Shandong, and some areas can reach the level of rainstorm to heavy rainstorm. Shanghai is located on the southern edge of the rain belt and is still a hot day, with a maximum temperature of 35 ℃ and a relative humidity of 95% to 60%. The night temperature is close to 30 ℃, and the heat sensation will last for a whole day.