Extended weather forecast refers to the weather forecast for several days?

The general weather forecast is 10 to 30 days.

At present, the short-term weather forecast within 3 days is accurate, and the medium-term weather forecast within 3- 10 days is not accurate. In fact, the daily available forecasting time limit with numerical forecasting model as the mainstream means is only about 10 days, and the longer the time, the lower the accuracy.

At present, there is still a lack of objective forecasting methods and tools for forecasting weather processes above 10 days, which has become a "time gap" between "weather" and "climate" forecasting. The forecast in this time interval is the extension period forecast, which is now generally used for the extension period forecast of 10-30 days.