What happened to the weather forecast?

Sometimes the weather forecast is inaccurate for three reasons: 1. Weather forecast needs a lot of meteorological observation data to support it. However, some areas are limited by topography and there are few observation points, such as the ocean and the Qinghai-Tibet Plateau. 2. Congenital deficiency of observation data will affect the accuracy of weather forecast. 3. Inaccurate instruments and instruments that need to be calibrated will also affect the accuracy of the forecast. The "accuracy" of weather forecast and the standard of meteorological service are different in people's understanding. For example, it's raining in one area, but it's not raining across the road. People in areas where it doesn't rain may think that the forecast of "rain" is not accurate. However, in meteorological operations, it is necessary to judge whether the forecast allows the corresponding station proportion requirements. "In a large area with multiple observation points, if the number of rainfall stations reaches a certain proportion, it is an accurate forecast in meteorological services.