Mesoscale forecasts with Eta model over Indian region

摘要

NCEP's mesoscale Eta model (Workstation Version 0.2) which was released in March 2000 has been installed on a SGI-Origin 200 workstation at National Centre for Medium Range Weather Forecasting (NCMRWF). The analysis and forecasts of the operational global spectral model (T80L18) are used as the initial and boundary conditions for the Eta model runs. Since 1 January 2002, the Eta model is being run for 72 h daily and the model forecasts are displayed on the NCMRWF website (www.ncmrwf.gov.in). The Eta model forecasts for a few recent cases of monsoon systems are discussed in this study. In general, it is found that Eta model forecasts of the position and intensity of the weather systems are in reasonable agreement with the observations. Furthermore, it is found that the Eta model gives better orography-induced rainfall. Impact of model's horizontal resolution on the prediction of a monsoon system is also studied. Finally, the performance of the Eta model for the month of June 2002 is evaluated.