A Study on the Prediction of Extraordinary Drought and Flood Events over the Middle and Lower Yangtze River

This paper analyzes the drought and flood events during Meiyu and summer over the middle and lower Yangtze River.Based on theseanalyses,we study the atmospheric circulation in earlier stage of the drought and flood,and identify predictable the factors lastly.A conception modelis developed,which is of great importanceto predict the extraordinary drought andflood events.