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Real-time dynamical index for the large-scale South Asian monsoon

Webster and Yang (1992) defined an index for the intensity of the South Asian monsoon as the vertical shear of the horizontal mean zonal wind [u(200 hPa) - u(850 hPa)] in the region (40 šE-110 šE, 0-20 šN).  The plots below are based on NCEP operational analyses for the current year, and NCEP reanalysis data for previous years and the climatology.

Reference:  Webster, P. J., and S. Yang, 1992:  Q. J. R. Meteorol. Soc., 118, pp. 877-926. 

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