How accurate is the weather forecast?

Sunny, cloudy and cloudy days account for 98%, and rainy and snowy days account for about 90%. The probability of bad weather such as fog, hail and sandstorm is very small, so the proportion is very high. Generally speaking, the temperature and wind are very accurate, and the weather forecast is only forecast in advance, and the overall accuracy is still very high. Weather forecast (measurement) or meteorological forecast (measurement) is to use modern science and technology to predict the state of the earth's atmosphere in a certain place in the future.

Weather forecast mainly uses a large number of collected data (temperature, humidity, wind direction and speed, air pressure, etc.). ), and then use the current understanding of atmospheric processes (meteorology) to determine future air changes. Because of the chaos of the atmospheric process and the fact that science has not fully understood the atmospheric process today, there will always be some errors in the weather forecast.

Prediction process

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. The World Meteorological Organization coordinates the timing of these data collections and sets standards. These measurements are made every hour or every six hours.

Data from meteorological satellites are becoming more and more important. Meteorological satellites can collect data from all over the world. Their visible photos can help meteorologists study the development of clouds. Their infrared data can be used to collect the temperature of the ground and cloud top. By monitoring the development of clouds, we can collect the wind speed and direction at the edge of clouds. However, because the accuracy and resolution of meteorological satellites are not good enough, ground data is still very important.