COMPOSITE CHART FOR THE VARIATION OF UPPER WESTERLIES AND IT’S USAGE

In the study of the circulation anomalies the mean monthly charts are ordinarily the main working tools. But, it is obviousthat on these mean charts the process of evolution can not be revealed in detail. In this paper a kind of composite chart is suggested to represent the actual variations of the upper westerlies for certain long period of time (month or season).On the composite chart the ordinate is the time and the abscissa, the longitude along certain latitude belt. Seven symbols to denote the different states of the upper circulation in the chosen latitude belt.are plotted in the chart and analyzed. The day to day variation of the upper circulation may then be studied in one chart.