The weather forecast is applies the atmospheric change the rule, according to current and near future synoptic situation, will carry on the forecast to the future certain time's weather conditions. It is according to the satellite cloud picture and the weather map analysis, after the union related meteorological data, the terrain and the season characteristic, the populace experience and so on synthetic study, makes. If our country Central Meteorological Station's satellite cloud picture, is our country makes “wind and cloud one” the meteorological satellite ingestion. Carries on the analysis using the satellite cloud picture picture, can enhance the weather forecast the rate of accuracy. The weather forecast usually divides into three kinds on the effectiveness length: Short-range forecast (2~3 days), medium-range forecast (4~9 days), long-range weather forecast (above 10~15 days). CCTV broadcasts is mainly the short-range forecast every day.