How to judge whether it will rain?

Modern weather forecast is marked by modern detection technology (meteorological satellite and weather radar) and numerical weather forecast model supported by high-speed computer, which gradually replaces conventional weather map forecast. The application of these technologies and methods in weather forecasting began in 1950s. [3]

prediction technique

Double station

/kloc-before the 0/7th century, people made weather proverbs by observing the changes of astronomical phenomena and celestial bodies, thus predicting the local future weather. /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. At this time, the weather is mainly predicted according to the changes of single station pressure, temperature, wind and cloud. [5]

synoptic chart

185 1 year, Britain sent observation data by telegraph for the first time, drew weather map on the ground, and made weather forecast according to the weather map. 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 made the analysis of weather evolution develop 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. [5]

numerical weather forecast

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.