How many kinds of weather symbols are there?

1、

2、

Weather symbols are special symbols representing various weather phenomena, clouds and sky conditions. Includes weather phenomenon symbols for observation and recording and weather graphic symbols for media communication.

But there are no weather symbols of "earthquake" and "landslide".

Extended data

Means of weather forecast:

1, two stations:

/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. ?

2. Weather 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.

3. 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.

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.