Abstract
During 1972 a year of large scale drought in the Indian summer monsoon rainfall, the mean u-field at 150 mb shows a weaker than normal tropical easterly jet stream over south Asia and a stronger than normal sub-tropical westerly jet stream over Australia; the mean v-field shows that the cross equatorial northerlies are weaker and displaced eastwards by about 20° longitude.
 
 The two years 1970 and 1975 of highest monsoon rainfall for India of the decade 1970-1979 were compared with the two years of lowest monsoon rainfall 1972 and 1979, In the strength of the sub-tropical Jet stream (STJ) over Australia as seen from an analysis of monthly mean u-fields of July and August. It is seen that during the poor rainfall years, the STJ is about 20% stronger than in the good monsoon years.
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