What is the symbol of the weather forecast?

Weather symbols are simple symbols used to express meteorology, which are often used in sunny days, rainy days, foggy days and so on.

The following shows the weather forecast symbol mode in detail:

Sonny:

Cloudy:

Evening:?

Xue:?

The weather symbol * * * is divided into two forms, namely day and night.

When observing a certain weather phenomenon, meteorological observers should record the corresponding symbols in the "Weather Phenomenon" column of the observation record book of the day, except for a few phenomena, and also record the starting and ending time. Based on these symbols, combined with the intensity, coexistence and some characteristics of weather phenomena, a group of symbols that can be filled in weather maps are called cartographic symbols.

Weather forecast (measurement) or meteorological forecast (measurement) is to use modern science and technology to predict the state of the earth's atmosphere in a certain place in the future. Since prehistoric times, human beings have begun to predict the weather and arrange their work and life accordingly (such as agricultural production and military operations). ).

Today's weather forecast mainly uses collecting a large number of data (temperature, humidity, wind direction and speed, air pressure, etc.). ), and then use the current understanding of atmospheric processes (meteorology) to determine future air changes. Because of the chaos of the atmospheric process and the fact that science has not fully understood the atmospheric process today, there will always be some errors in the weather forecast.

The satellite cloud image of China Central Meteorological Observatory was taken from Fengyun-1 and other meteorological satellites. Using satellite cloud images for analysis can improve the accuracy of weather forecast. Weather forecast is usually divided into three types: short-term weather forecast (2 ~ 3 days), medium-term weather forecast (4 ~ 9 days) and long-term weather forecast (10 ~ 15 days or more). CCTV mainly broadcasts short-term weather forecast every day.

In ancient times, it was mainly based on the principle of yin and yang and five elements. To put it simply, ancient China people divided everything in the world into five forms: gold, wood, water, fire and earth, plus two states of yin and yang (this classification is not static, but also constantly changing), and made predictions according to their own states and transformation laws.

The lunar solar terms in the calendar are the weather forecasts left by our ancestors.

Qin has the functions of observing astronomical phenomena, calculating solar terms and making calendars.

From the Qin and Han Dynasties to the Southern Dynasties, the Emperor Tai Shang belonged to the Taishiling Star Calendar. Sui secretary provincial Taishi Cao, Yang-ti changed Cao to supervisor. At the beginning of the Tang Dynasty, Taishi supervisor was changed to Taishi Bureau, and the successor was renamed Secretary Pavilion, Mixed Day Supervisor, Mixed Justice Supervisor, or Secretary Province several times.

In the 14th year of Kaiyuan (726), it was re-established as Taishi Bureau and was the secretary province. In the first year of Gan Yuan (758), it was renamed Si Tiantai. In the Five Dynasties and the Early Song Dynasty, it was called Division, and Yuanfeng was changed to Taishi Bureau after restructuring. There is a supervisor in southern Liaoning, and the gold is called Tiantai, which belongs to the supervisor. In the Yuan Dynasty, there was imperial academy, which was juxtaposed with Si Tianjian and Hui Sijian.

In the early Ming Dynasty, there were supervisors and deputy supervisors, and at the end of the year, western missionaries took part in the work.

In the Qing Dynasty, the management supervisor was a senior official, and the supervisor and deputy supervisor were both from China and Manchu, with the participation of western missionaries. At the beginning of Qianlong, the deputy supervisors were divided into Manchu, Chinese and Western. After that, Huaxi people either returned or died, and no outsiders were needed to enter the official. ?

Around 650 BC, Babylonians used the appearance of clouds to predict the weather. Around 340 BC, Aristotle described different weather conditions in his astronomical theory. China people have recorded the weather forecast at least around 300 BC. The ancient weather forecast mainly depended on some weather phenomena. For example, people often observed sunny weather after sunset. This observation has accumulated a lot and formed a weather proverb. However, many of these proverbs were later proved to be incorrect.

Numerical weather forecast is to use the atmospheric motion equation to integrate the equation under certain initial and boundary conditions to forecast the future weather. 192 1 year, Richardson first tried to forecast the weather by numerical method. Because of the huge calculation workload, he organized a lot of manpower and designed a detailed calculation table to complete it. However, due to the failure to properly handle the role of high-frequency waves in the atmosphere, the predicted results are seriously inconsistent with the actual changes in the atmosphere.

1950, Charney successfully made a 24-hour numerical forecast based on the atmospheric motion equations after filtering high-frequency waves by using the world's first computer ENIAC. With the development of computer technology, the progress of observation means and the deepening of understanding of atmospheric physical processes, numerical weather forecasting has made great progress and become the main means of weather forecasting. Especially since the launch of meteorological satellites in the 1960s, the satellite detection data have made up for the shortage of meteorological data in oceans, deserts, polar regions and plateaus, and the level of weather forecasting has been significantly improved.