By using predictor puffing method, this paper calculated and analyzed the anomalies of 74 atmospheric circulation characteristics during various periods which were puffed from last January to April of this year.

• 摘要选择上年1月至当年4月为预报时段，采用预报因子膨化技术，将大气环流特征量按月依次组合成不同时段，计算出不同膨化时段的74项大气环流特征量距平值。