The secret reading answer of weather forecast.

The secret of weather forecast

Do you need to take an umbrella when you go out, whether you can go to bask in the quilt tomorrow, whether you need to water and drain the fields, whether the flight will be delayed ... If you want to know the answers to these questions, just look at the weather forecast and you will know everything. It can be said that in today's society, weather forecast is an important information that everyone can't do without.

What's the weather forecast?

From a long time ago, human beings tried to predict the weather the next day or a few days later. Around 650 BC, Babylonians predicted the weather according to the appearance of clouds. Around 340 BC, Aristotle described different weather conditions in his astronomical theory. People in China recorded the weather forecast around 300 BC. The ancient weather forecast mainly depended on some weather phenomena. For example, people often observed sunny weather after sunset. The accumulation of this observation has formed weather proverbs, such as "Don't go out at sunrise, but travel thousands of miles at sunset". And long-term observation and summary of weather phenomena. Formed a forecast of the climate, such as "eat the Dragon Boat Festival dumplings first and then send cotton-padded clothes". These are the crystallization of wisdom summed up in long-term life practice.

Since 1950s, the principles of dynamic meteorology, mathematical and physical methods and statistical methods have been widely used in weather forecasting. The simplified equations of atmospheric fluid mechanics and thermodynamics can be solved by high-speed electronic computer, and the weather forecast can be made in time, which greatly improves the accuracy of the forecast. 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.

In 1970s, with the progress of computer hardware, digital weather forecast appeared and developed rapidly. Today, it has become the most important weather forecast method.

We must collect enough data before making the weather forecast. The most traditional data are data such as air pressure, temperature, wind speed, wind direction and humidity collected by professionals, enthusiasts, automatic weather stations or buoys on the ground or at sea. In addition, meteorologists also need to collect the temperature, humidity and wind power values at high altitude through weather balloons. There are also weather radars, which can provide information on the area and intensity of precipitation, and Doppler radars can also determine the wind speed and direction. The most important thing is the data of meteorological satellites. Meteorological satellites can collect data from all over the world. Their visible photos can help meteorologists intuitively judge the development of clouds, and infrared data can be used to collect the temperature of the ground and the top of clouds. By monitoring the development of clouds, we can collect the wind speed and direction at the edge of clouds. Next, the collected data should be analyzed, and the collected data should be combined with the digital model used for prediction to get the three-dimensional prediction of temperature, humidity, air pressure, wind speed and wind direction. Then use a computer to simulate the operation of the atmosphere. Based on the sum of data analysis, it calculates the change of atmosphere with time according to the results of physics and fluid mechanics. Because the equations of fluid mechanics are very complicated, digital weather forecast can only be carried out by supercomputers. The output calculated by this model is the basis of weather forecast. Finally, the results are corrected and explained, so that users can understand the results, that is, directly tell you the next day's temperature changes, whether there is rain or snow, or the path of typhoon operation and so on.

Of course, there is also an indispensable link, that is, making the results of weather forecast public through TV, Internet, SMS and other media channels, so that everyone can know the latest weather changes at the first time in case of emergency.

Exercise:

17. This article organizes the materials in chronological order. Read the full text and complete the table below.

18. What is the process of modern weather forecast? According to the content of the article, it is summarized by four-word phrases respectively.

First, then what? And finally? .

19. What is the explanation of the following sentence? What's the role?

(1) Around 340 BC, Aristotle described different weather conditions in the Theory of Astronomy.

(2) "Don't go out at sunrise, but go to Wan Li Road at sunset".

20. Can the word "the most important" in the following sentence be deleted? Please explain your reasons.

In 1970s, with the progress of computer hardware, digital weather forecast appeared and developed rapidly. Today, it has become the most important weather forecast method.

Answer:?

17, ① The accuracy of forecast has also been greatly improved ② The level of weather forecast by meteorological satellites has been significantly improved ④ Digital weather forecast.

18, collect data, analyze data and explain results.

19, (1) for example, it shows that human beings have tried to predict the weather very early?

(2) Cite data, and specifically explain that human's long-term observation of weather phenomena has formed a forecast of climate?

There are many ways to explain weather forecast, and digital weather forecast is the most important one. If this modifier is deleted, it is not in line with the actual situation. The use of "most important" reflects the rigor of interpretation language.