How do you get the temperature of the weather forecast?

Weather forecast is a very complicated mathematical and physical process. Actually, it is an interdisciplinary subject between mathematics and physics. Compared with mathematics and physics, it belongs to a young science. At present, the accuracy of weather forecast is difficult to meet people's requirements. One of the reasons is that we don't have a deep understanding of some changing laws of the whole atmosphere. At present, we make weather forecast by observing the atmosphere through observation stations all over the world, collecting the observed data, and calculating and solving it by using a completely simplified mathematical and physical model to predict how to develop in the future. Because our mathematical and physical model describing the weather is simplified, it is impossible to be very accurate. Why should we simplify it? Because we don't have a faster computer, we can calculate quite complicated nonlinear mathematical and physical models in a limited time. Because the weather changes quickly, it is useless if your computer works out in two days, so the computer must be efficient. China's forecast level belongs to the category of developed countries, although we are a developing country. But at present, there are still many unexpected weather, which is also a difficult problem we have been solving.

Watch the weather before morning exercise.

Meteorological conditions will directly affect the quality and health of your morning exercise. The morning exercise index is useful at this time. According to the weather conditions such as sky conditions, wind power, temperature, humidity and pollution, it is divided into five grades: 1 grade, and all meteorological conditions are very good, which is very suitable for morning exercise; Generally, the meteorological conditions of Grade 1, 2 and 3 are not very good, but they are still suitable for morning exercises. There will be three or four meteorological conditions at level 4, which are not suitable for morning exercise; When all weather conditions are bad and the index reaches level 5, don't do morning exercises.

The morning exercise index will remind us that if it is cloudy, we should avoid doing morning exercises in the Woods to avoid carbon dioxide poisoning. When it is rainy in spring and summer, the road is slippery and easy to fall, so it is best not to do morning exercises. Sometimes there is fog in spring, and foggy days are not suitable for morning exercise, because high-density fine water droplets are suspended in the air, and harmful substances such as acid, alkali, salt, amine, benzene, phenol, dust and pathogenic microorganisms in the air are dissolved in the water droplets, and the oxygen demand of the body will increase during morning exercise, but the harm of harmful substances to the respiratory system will cause insufficient oxygen supply, which will lead to difficulty in breathing and chest tightness, and bacteria will also take advantage of it to endanger our health.

Intimate reminder: when the air quality is 1-3, it is more suitable for morning exercise; At level 4, you can choose to do anaerobic exercise indoors; At level 5, you must stop doing morning exercises.

Do morning exercises after sunrise.

I don't remember when "air pollution index" became a new term that people care about. Prediction of air pollution index (API) is calculated by comparing the average concentration of pollutants on a certain Sunday with the concentration limit of air pollution index classification, which is about meteorological conditions and pollutant diffusion.

The air pollution index is less than 50, indicating that the air quality is Grade I; When the air pollution index is more than 50 and less than 100, it means that the air quality is Grade II, which is more in line with the air quality requirements of our living environment. When the air pollution index is greater than 100 and less than 200, it means that there will be some pollutants in the air, such as tail gas, dust, sulfur dioxide, inhalable particles, etc., which belong to mild pollution. In a lightly polluted environment, we will have some irritating reactions, such as coughing, sneezing, dry nose and mouth, etc. People with heart or respiratory diseases had better reduce physical exertion and outdoor activities.

The air pollution index is 200 to 300, indicating that the air quality exceeds the limit of the third-class standard, indicating that the air quality is poor. Symptoms of patients with heart disease and lung disease are obviously aggravated, exercise tolerance is reduced, and common symptoms of healthy people? Old people who smoke and patients with heart disease and lung disease should stay indoors to reduce physical activity.

When the air pollution index is greater than 300 or even 500, it will reach moderate or even severe pollution, which is a great threat to our health. Our exercise tolerance will be reduced, the symptoms will be obvious and strong, and diseases such as colds, pneumonia, cardiovascular and cerebrovascular diseases will appear in advance. Old people should stay indoors to avoid physical exertion.

Intimate tip: Scientists have detected that air pollution is light in the morning, noon and afternoon, and the air is relatively clean, around 10 in the morning, and the air is freshest from 3: 00 to 4: 00 in the afternoon. On the contrary, air pollution is more serious in the morning, evening and evening, and the peak of pollution appears at 7 am and 7 pm. So I suggest you choose the morning exercise time after sunrise.

Sun protection should be done early in spring.

The weather forecast mentions the ultraviolet index every day, that is, the intensity of ultraviolet radiation, which is very different from other indexes. Many indexes are in the range of 1-5, but the ultraviolet index is in the range of 0- 10. When the ultraviolet index is 0-2, the exposure degree is the weakest, which has little effect on us. Just wear a sun hat when going out. When the ultraviolet index reaches 3-4, although the intensity is not very strong, you need to wear sunglasses and sunscreen when you go out to prevent your skin from being damaged by solar radiation.

If the ultraviolet index has reached 5-6, the ultraviolet rays are relatively strong at this time, and go out to a cool place as much as possible; When the ultraviolet rays reach 7-9, it is best not to bask in the sun on the beach from 10 to 4 pm; When the ultraviolet index is equal to 10, the intensity will be very high, so try to avoid going out, because the ultraviolet radiation at this time is extremely harmful.

Intimate tip: Although the ultraviolet rays in spring are not as strong as those in summer, you have to guard against them in sunny days. You may wish to apply sunscreen in time when you go out.

The disease prevention index is also predicted.

I don't know if you have noticed that there are still many disease prevention indexes, which are slowly coming into our lives. Compared with other indicators, these disease prevention indicators are more closely related to our health.

★ Cold index

Spring is the high incidence of colds, and the cold index in the weather forecast may be very useful for preventing colds! The higher the cold index, the higher the chance of catching a cold.

★ dressing index

According to the weather conditions that the natural environment has the greatest influence on human feelings, such as sky conditions, temperature, humidity, wind, etc., experts from the meteorological department conducted analysis and research, and summed up the weather index of dressing, which can remind you to dress in time according to weather changes and reduce diseases caused by improper dressing.

The meteorological index of clothing is divided into 8 grades. The smaller the index, the thinner the clothes are.

Dressing index is generally at Grade 3-5 in spring. Grade 3 is warmer and the temperature is higher. You can wear long-sleeved shirts and trousers, and the elderly can wear knitted long-sleeved shirts, vests and trousers. Level 4 weather is more comfortable, you can wear a thinner coat and jeans, and people with weak constitution may wish to wear cotton-padded clothes.

★ Pollen allergy

The incidence of pollen allergy is relatively high in spring, and ash tree, Ailanthus altissima and Artemisia argyi are the most important allergic pollen.

In spring, people who are allergic to pollen should try to avoid pollen and minimize outdoor activities, or wear masks to reduce the amount of pollen inhaled during outdoor activities. In case of dry heat or windy days, doors and windows can be closed, and it is best to hang wet curtains when opening windows to prevent or reduce pollen intrusion.

In addition, Beijing Meteorological Bureau will monitor pollen and provide you with guidance on how to deal with pollen allergy at "22 1" and "268" voice service desks.

A lot of talk is actually about measuring the direction and temperature of airflow through satellites at high altitude and informing everyone in advance through weather forecast.

But now the weather forecast is often inaccurate.

Therefore, the weather forecast is for reference only, and you can't believe it all.