Studies on the Sesonal Weather Forecasting (V, b)

The useful rules to estimate the anomaly of 5-day mean surface temperature by using the anomaly chart of 5-day mean 700-mb height are studied and the following results are obtained.1) Positive height anomaly at 700-mb level is generally associated with positive anomaly of the surface temperature, while, in case of negative height anomaly, relation between them is rather complex. But it correlates rather well with warm or cold air advection on the 700-mb anomaly chart.2) The correlation field between the surface temperature anomaly at Tokyo and the anomaly of 700-mb height over East Asia are shown in Fig.1. These patterns show that anomaly of the surface temperature is mainly influenced by the large scale disturbances in westerlies.3) Correlations between the surface temperature anomaly at Tokyo and various elements such as anomaly of Zonal Index, Meridional Index and vorticity are calculated.