Abstract
Seasonal and annual freq1leoncies of cyclonic disturbances that occurred over the area extending from Lat, 5 N to 35 N and Long, 50 E to 100 E for the period of 80 years from 1891 to 1970 have been examined by fitting orthogonal polynomials and by power spectrum analysis.
 The analyses reveal a significant falling trend in the number of cyclonic disturbances in the SW monsoon season. This fall seems to have began at the start of the present century, Annual cyclonic disturbances show a falling trend after 1940 upto1965 and rise afterwards. The long period oscillation of about 40 years is seen in the SW monsoon and annual number of cyclonic disturbances. There IS also an evidence of q1lasi-biennial oscillation in the number of cyclonic disturbances during SW monsoon season.
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