Abstract
In this study an effort is done to explain the maintenance of the Very Severe Cyclonic Storm(VSCS) Ockhi using the angular momentum(AM) budget technique . The AM budget equation for a region bounded by , to and to in (x,y,p,t) co-ordinate system is used from an earlier study. The different terms are explained with relative importance. This technique is used to the diagnosis of different small, medium and large weather systems by several authors. The Very Severe Cyclonic Storm(VSCS) Ockhi –a rare situation in Arabian Sea – is studied with a reanalyzed dataset in a fine mesh width. The values of different terms in the AM budget equation are calculated for pressure levels-1000,800,500,200,100hpa’s and for four day periods viz. 30 Nov ,01 Dec ,02 Dec and 03 Dec 2017 .The AM budget was prepared for the eight observation time periods of 00, 03,06,09,12,15,18,21 UTC for each day. The area selected is 5.04N - 19.2N, 60E- 77E where VSCS TC Ockhi formed.The sink and source terms are compared and the results are correlated with the help of charts . The NCMRWF IMDAA data set is used and the results are depicted in charts and results are compared with the observed synoptic behavior of the system .
 Keywords: - Angular Momentum Budget, Equation, Source/Sink terms,
 VSCS Ockhi-Diagnosis
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