Improvements in the weather prediction over the Indian region using regional spectral model

Abstract

Florida State University Regional Spectral Model (FSURSM) has been installed at India Meteorological Department, New Delhi and test runs have been made. A suitable change in the model code were made to use analysis and forecast fields as initial and boundary conditions for the model from the global T-80 model run at the National Centre for Medium Range Weather Forecasting (NCMRWF). The resolution of the regional spectral model is 0.75^° transform grid, which is equivalent to the resolution of a T-170 global model. The model has been integrated for 3 days and studies undertaken to test the performance of the regional model in respect of some of the major weather events that occurred during December 2002 and February 2003. Using initial analyses from ECMWF and NCMRWF, the impact of initial fields on model forecast is also investigated. The case studies show that the forecasts from the regional spectral model are reasonably close to the observed features. The intensity and movement of model simulated systems are in good agreement with the observations.