Large-scale events like low pressure belt, depression, cyclone can be predicted five days ahead - we (the IMD) give warnings, NDRF (National Disaster Response Force) is posted, action is taken. But small-scale events with dimensions of less than 1 km and with a lifetime of a few minutes are a challenge, not just in India but globally. Detection is also difficult, such as the cloudburst in the hilly areas of Amarnath. Satellite images have limitations. Radar has higher resolution but the problem is it can visualise a weather system only if the radiation emitted is getting reflected by the weather system.