How is the official weather forecast produced?

19th century, with people's basic understanding of the atmosphere, measurement technology has been improved. During the American colonial period, Benjamin Franklin first observed the storm in Philadelphia and learned that it subsequently swept through Boston, thus inferring that the meteorological system moved from west to east. Later, due to the widespread use of 19 telegrams in the 1950s, people summarized the observation results in a few minutes, and the real weather forecast was born. In this field, accurate records held by the military and merchant fleet are very important. At the same time, physicists and chemists discovered the laws governing the atmosphere, and meteorologists explained its dynamics. By 1900, several national meteorological services issued official weather forecasts.