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"Analysis of fifty four  1951   2004  years of daily energetics of zonal waves derived from NCEP NCAR wind  u and     data and daily rainfall received over the Indian landmass  real time data  during southwest monsoon season  1 June   30 September  indicate that energetics  momentum transport and kinetic energy  of lower tropospheric ultra-long waves  waves 1 and 2  of low latitudes hold a key to intra-seasonal variability of monsoon rainfall over India  Correlation coefficient between climatology of daily  122 days  energetics of ultra-long waves and climatology of daily rainfall over Indian landmass is 0 9  The relation is not only significant but also has a predictive potential  The normalised plot of both the series clearly indicates that the response period of rainfall to the energetics is of 5   10 days during the onset phase and 4   7 days during the withdrawal phase of monsoon over India  During the established phase of monsoon  both the series move hand-in-hand  Normalised plot of energetics of ultra-long waves and rainfall for individual year do not show marked deviation with respect to climatology  These results are first of its kind and are useful for the short range forecast of rainfall over India "
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