A large volume of rainfall data from various locations and an Australian Rainman software package enabled scientists at the Department of Agricultural Meteorology, the Directorate of Soil and Crop Management Studies, Tamil Nadu Agricultural University to put together the seasonal rainfall forecast for the South West Monsoon.
Scientists produced a map depicting the forecast for all districts in Tamil Nadu. Their predictions are based on the Southern Oscillation Index and the Sea Surface Temperature values. Historical rainfall data from research stations of the University made up the district information. If there was no research station in a particular area, the scientists used data from the software. Monthly rainfall records for 9,500 locations around the globe were incorporated in the software. This also helped produce tables, graphs and maps. There are three different editions of the software, standard, educational and professional, to meet the needs of different categories of users.