Extracurricular reading: the secret of weather forecast: do you want to bring apples when you go out, ending: just in case.

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. 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. Such observations have accumulated to form weather proverbs, such as "don't go out at sunrise and travel thousands of miles at sunset". Long-term observation and summary of weather phenomena have formed a forecast of the climate, such as "eat Zongzi at the Dragon Boat Festival first, then send cotton-padded clothes". These are the crystallization of wisdom summed up in long-term life practice.

/kloc-after the 0/7th century, meteorological observation instruments such as thermometers and barometers appeared one after another, and ground weather stations were established one after another. Scientists began to use these scientific instruments to measure weather conditions and predict the weather based on these data. However, at that time, people could not quickly transmit data to distant places, and for a long time, people could only use local meteorological data to forecast the weather, which made the weather forecast very limited.

1837 after the invention of the telegraph, people can use large-scale meteorological data to predict the weather. 185 1 year, Britain sent observation data by telegraph for the first time, and drew weather maps on the ground for weather forecast. Since the 1920s, air mass theory and polar front theory have been applied to weather forecast. In 1930s, the invention of radiosonde, the appearance of high-altitude weather map and the wide application of long-wave theory in weather forecast expanded the analysis of weather evolution from two-dimensional to three-dimensional. In the late 1940s, the application of weather radar provided an effective tool for forecasting precipitation, typhoon, rainstorm and severe storm.

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