How likely is forecast by the direction and speed of movement of weather systems that occur. The expectation that in future such systems will move at any position on how well weather and climate systems without changing direction, speed and intensity. This method is often used for forecasting rainfall in less than half an hour. Predicting how climate is expected by the average of static climate many years, this method works well when the nature of the weather conditions as close to normal in the season, it is often used for forecasting long-term. Weather Forecast Server is used to calculate the change of variables involved. The conditions of weather Using numerical models (numerical model), which is a replica of the atmosphere and Earth's surface. With mathematical equations delicate and complex limitations of this approach is the model. No details of a practical nature that weather forecasters often used to forecast how many shared as appropriate. To get the most accurate prediction possible.