Weather forecasting system, weather forecasting method, and weather forecasting program

摘要

PROBLEM TO BE SOLVED: To continuously keep the precision of predicted value even when the initial value acquiring period of weather model calculation is insufficient to continuously perform prediction calculations for next several hours by data assimilation. SOLUTION: In a weather predication model operation, a first calculation of weather prediction model is started (S22) after receiving grid point value (GPV) data (S21), and assimilation of the observation value by the first calculation (S23) and prediction calculation (S24) are performed. After waiting up to the next calculation time (after 3 hours) (S25), a second calculation is started (S26). At this time, the prediction value 3 hours ago obtained by the first calculation is used as the initial value to perform the assimilation of the second observation value (S27), and only a precise prediction value after data assimilation in the short-time prediction up to three hours later is calculated (S29). After waiting to the next calculation time (after 1 hour) (S29), a third calculation is started (S30). At this time, the prediction value 1 hour ago obtained in the second calculation is taken as the initial value to perform a calculation up to 3 hours later, and only a precise prediction value is determined. Thereafter, the same processing as the third is repeated.